2021/10/25 更新

写真a

シンボ カズナリ
新保 一成
SHINBO Kazunari
所属
教育研究院 自然科学系 情報電子工学系列 教授
自然科学研究科 電気情報工学専攻 教授
工学部 工学科 教授
職名
教授
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外部リンク

学位

  • 博士(工学) ( 1995年3月   新潟大学 )

研究キーワード

  • 表面プラズモン

  • 水晶振動子微量天秤

  • 有機トランジスタ

  • 有機太陽電池

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 電気電子材料工学

経歴

  • 新潟大学   工学部 工学科   教授

    2017年4月 - 現在

  • 新潟大学   自然科学研究科 電気情報工学専攻   教授

    2012年6月 - 現在

  • 新潟大学   自然科学研究科 電気情報工学専攻   教授

    2012年6月 - 現在

  • 新潟大学   電気電子工学科   教授

    2012年6月 - 2017年3月

  • 新潟大学   電気電子工学科   准教授

    2004年4月 - 2012年5月

  • 新潟大学   工学部   講師

    1997年4月 - 1998年2月

  • 新潟大学   工学部   助手

    1995年4月 - 1997年3月

▶ 全件表示

 

論文

  • Colorimetric Detection Based on Localized Surface Plasmon Resonance for Determination of Chemicals in Urine

    Chutiparn LERTVACHIRAPAIBOON, Akira BABA, Kazunari SHINBO, Keizo KATO

    Analytical Sciences   37 ( 7 )   929 - 940   2021年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society for Analytical Chemistry  

    DOI: 10.2116/analsci.20r005

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  • Fabrication of Silicon Nanowires by Metal-Catalyzed Electroless Etching Method and Their Application in Solar Cell

    Naraphorn TUNGHATHAITHIP, Chutiparn LERTVACHIRAPAIBOON, Kazunari SHINBO, Keizo KATO, Sukkaneste TUNGASMITA, Akira BABA

    IEICE Transactions on Electronics   E104.C ( 6 )   180 - 183   2021年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transele.2020oms0008

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  • The effect of gold quantum dots/grating-coupled surface plasmons in inverted organic solar cells

    Kulrisa Kuntamung, Patrawadee Yaiwong, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba

    ROYAL SOCIETY OPEN SCIENCE   8 ( 3 )   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC  

    We studied the effect of gold quantum dots (AuQDs)/grating-coupled surface plasmon resonance (GC-SPR) in inverted organic solar cells (OSCs). AuQDs are located within a GC-SPR evanescent field in inverted OSCs, indicating an interaction between GC-SPR and AuQDs' quantum effects, subsequently giving rise to improvement in the performance of inverted OSCs. The fabricated solar cell device comprises an ITO/TiO2/P3HT : PCBM/PEDOT : PSS : AuQD/silver grating structure. The AuQDs were loaded into a hole transport layer (PEDOT : PSS) of the inverted OSCs to increase absorption in the near-ultraviolet (UV) light region and to emit visible light into the neighbouring photoactive layer, thereby achieving light-harvesting improvement of the device. The grating structures were fabricated on P3HT:PCBM layers using a nanoimprinting technique to induce GC-SPR within the inverted OSCs. The AuQDs incorporated within the strongly enhanced GC-SPR evanescent electric field on metallic nanostructures in the inverted OSCs improved the short-circuit current and the efficiency of photovoltaic devices. In comparison with the reference OSC and OSCs with only green AuQDs or only metallic grating, the developed device indicates enhancement of up to 16% power conversion efficiency. This indicates that our light management approach allows for greater light utilization of the OSCs because of the synergistic effect of G-AuQDs and GC-SPR.

    DOI: 10.1098/rsos.210022

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  • Dual-mode surface plasmon resonance sensor chip using a grating 3D-printed prism

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    ANALYTICA CHIMICA ACTA   1147   23 - 29   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    The method for fabricating a grating prism surface plasmon resonance (SPR) sensor chip was developed. The grating prism was 3D-printed by a stereolithography 3D printer and subsequently created a grating pattern by soft lithography. A gold film was thermally evaporated on the grating prism. Moreover, a liquid cell was 3D-printed and assembled into a gold-coated grating prism. To make the sensor chip compact and practical, a compatible prism holder was 3D-printed by a fused deposition model 3D printer. The SPR sensor chip was mounted on the rotation stage and the SPR spectrum was recorded by spectrometer. The SPR excitation of the sensor chip can be extended to the near-infrared region by creating a grating pattern on the prism surface. A gold-coated grating prism exhibited dual modes of SPR excitations, namely, prism-coupling SPR (PC-SPR) and grating-coupling SPR (GC-SPR). The dual-mode SPR excitation was observed at the incident angles of 45 degrees-80 degrees. When the incident angle increased, the SPR excitation of the PC-SPR mode exhibited a blue shift in the wavelength region of 480-690 nm, whereas the GC-SPR mode exhibited a red shift in the wavelength region of 670-770 nm. The surface plasmon (SP) dispersion obtained from the dual-mode SPR configuration confirmed observable PC-SPR (which corresponded to + SP0 of the gold-resin interface) and GC-SPR (which corresponded to -SP+1 of the gold-air interface), which could be excited from the developed substrate. The refractive index sensitivities of the PCSPR and GC-SPR modes were 2924.4 and 414.9 nm RIU-1, respectively. The SPR excitations of the sensor chip exhibited a simultaneous shift when the local refractive index of the materials adjacent to the gold-coated grating prism surface was changed, especially the material that had overlapping light absorption at the SPR excitation wavelength. Using this fabrication process, the prism is designed and then printed; moreover, the grating pattern on the prism surface can be employed to tune the SPR excitation wavelength of the sensor chip for the versatility and broad perspective of the optical sensing-based SPR. (C) 2020 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.aca.2020.12.027

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  • Characterization of a silicon nanowire array using reflected images captured by a smartphone camera

    Chutiparn Lertvachirapaiboon, Naraphorn Tunghathaithip, Sukkaneste Tungasmita, Akira Baba, Kazunari Shinbo, Keizo Kato

    INSTRUMENTATION SCIENCE & TECHNOLOGY   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS INC  

    A practical technique for determining the length of a silicon nanowire (SiNW) array is reported by the analysis of reflected images from a smartphone camera. The SiNW array was prepared by electroless chemical etching and its length controlled by the etching time of a Si wafer. The average lengths for the SiNW array were characterized by scanning electron microscopy. The relationship between the reflection spectrum and the length of the SiNW array was investigated. The ratio of percent reflectance from 900 to 550 nm exponentially increased from 1.8 +/- 0.1 to 22.2 +/- 1.3 when the average length increased from 184 +/- 12 to 1237 +/- 23 nm. Optical sensing for characterization of the length of SiNW was further developed into a simple and practical technique using a smartphone camera as a detector. A 3D printed tool was assembled to the smartphone to control the light path and the reflected image of the SiNW array was acquired. The reflected intensity ratio obtained from the reflected images with long pass to short pass filters increased analogously to the spectroscopic results. This optical-sensing-based smartphone showed simple and rapid detection for determining the lengths of a SiNW array and a SiNW array coated with a polymer film. This platform is compact and capable of on-site detecting and is promising for the characterization of reflective materials.

    DOI: 10.1080/10739149.2021.1887889

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  • Surface Plasmon Resonance Field-Enhanced Fluorescence Properties of Gold Quantum Dots on Polyelectrolyte Multilayers and Their H2O2 Sensor Application

    Patrawadee Yaiwong, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba

    PLASMONICS   2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    In this work, we investigate surface plasmon field-enhanced fluorescence (SPF) emission from gold quantum dots (AuQDs) on a polyelectrolyte multilayer ultrathin film deposited onto an Al thin film. Polyelectrolyte layers of poly(diallyl dimethyl ammonium chloride) (PDADMAC) and poly(sodium 4-styrenesulfonate) (PSS) are deposited onto the Al surface using a layer-by-layer (LbL) adsorption technique. AuQDs are subsequently deposited onto the PDADMAC/PSS ultrathin films to study their fluorescence enhancement/quenching phenomenon, as monitored by SPF spectroscopy. The distance between the AuQDs and the Al thin film is controlled by the number of deposited PDADMAC/PSS LbL films. With increasing number of the PDADMAC/PSS bilayers, the fluorescence intensity of the AuQDs increases until the optimum distance between the AuQDs and Al layers is achieved. Moreover, silver nanoprisms (AgNPrs) are coated onto the AuQDs for H2O2 sensing. When the AgNPrs are present, a decrease in the fluorescence intensity of the AuQDs due to energy transfer from the AuQDs to the AgNPrs is observed. Recovery of the fluorescence intensity of the AuQDs is observed upon injection of a H2O2 solution, where the recovery of the intensity is proportional to the H2O2 concentration in the range from 1 pM to 100 nM and results from the oxidation reaction or etching of the AgNPrs. The fluorescence recovery is attributed to weakening of the quenching effect by a reduction in concentration of the AgNPrs. The proposed system exhibits strong potential for the development of H2O2 sensors.

    DOI: 10.1007/s11468-021-01388-8

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  • Colorimetric Determination of Urinary Creatinine in Proteinuria Patients by Chromaticity Analysis of Gold Nanoparticle Colloidal Solutions

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    ANALYTICAL SCIENCES   36 ( 12 )   1495 - 1500   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC ANALYTICAL CHEMISTRY  

    Several scientific works have reported the use of colloidal gold nanoparticle (AuNP) solutions as a colorimetric probe for creatinine detection. Nonetheless, urinary protein is one of the primary chemical components that can interfere with creatinine detection. In this work, we developed a colorimetric probe using AuNP colloidal solution to detect creatinine in the urine of proteinuria patients. A microchamber array was prepared to minimize the sample volume and was used to simultaneously perform spectral recording and image acquisition of several samples. The analyzed volume for each sample was 15 mu L. A camera coupled with liquid crystal tunable filters was used to record hyperspectral images, and the signals were then converted to localized surface plasmon resonance (LSPR) spectra. Color changes in the AuNP colloidal solution in the presence of varying concentrations of creatinine and human serum albumin (HSA) indicated different features and could be detected by a hyperspectral imaging technique. The relevant concentration ranges of creatinine and HSA were 5 - 200 and 50 - 250 mg dL(-1), respectively. Furthermore, a smartphone camera was adopted to record a color mapping image of the AuNP colloidal solution in the presence of creatinine and HSA at these concentration ranges. Contour plots of red and blue chromaticity levels from color mappings were produced, and 2D fitting equations obtained from these contour plots were adopted to determine the creatinine concentration in the urine of proteinuria patients. This practical technique can be used for screening and can be further developed as a household biosensing device for urinalysis.

    DOI: 10.2116/analsci.20P235

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  • In-situ and simultaneous evaluation of optical absorption and deposition for phthalocyanine layer-by-layer thin films using an optical waveguide sensor utilizing surface plasmon resonance 査読

    Kazunari Shinbo, Chutiparn Lertvachirapaiboon, Yasuo Ohdaira, Akira Baba, Keizo Kato

    Japanese Journal of Applied Physics   59 ( 11 )   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    © 2020 The Japan Society of Applied Physics. A novel optical waveguide sensor utilizing surface plasmon resonance (SPR) that enables the measurement of optical absorption and the thickness of a thin film was proposed. A BK-7 glass slide was used as a waveguide core, and an Ag/Au film of 5 mm width and transparent polymethyl methacrylate-co-methacrylic acid (PMMA-co-PMAA) were consecutively deposited to develop the sensor. The PMMA-co-PMAA film was used to control the SPR wavelength. This sensor allows us to measure the optical absorption and thickness of the deposited film using the evanescent wave from the waveguide and the SPR phenomena, respectively. In order to demonstrate this, a layer-by-layer deposit of a film of water-soluble phthalocyanine dye (Alcian blue, pyridine variant, AB) and polystyrenesulfonate was observed. Additionally, adsorptions from a mixed solution of AB and polydiallyldimethylammonium chloride were observed.

    DOI: 10.35848/1347-4065/abbfe6

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  • Enhancement of organic thin-film solar cells by incorporating hybrid Au nanospheres and Au nanorods on a metallic grating surface 査読

    S. Phetsang, S. Anuthum, P. Mungkornasawakul, C. Lertvachirapaiboon, R. Ishikawa, K. Shinbo, K. Kato, K. Ounnunkad, A. Baba

    Molecular Crystals and Liquid Crystals   705 ( 1 )   41 - 47   2020年7月

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    掲載種別:研究論文(学術雑誌)  

    © 2020 Taylor & Francis Group, LLC. In this study, we demonstrate the fabrication of hybrid plasmonic solar cells using gold nanoparticles (AuNPs). Two types of AuNPs, gold nanospheres (AuNSs) and gold nanorods (AuNRs), were incorporated in a hole transport layer (HTL) (PEDOT:PSS) on a metallic grating electrode. The organic solar cells (OSCs) structure comprised an indium-tin-oxide (ITO)-coated glass substrate/PEDOT:PSS:AuNSs:AuNRs/P3HT:PCBM/Al grating electrode. Adding AuNPs induced localized surface plasmon resonance (LSPR), while grating structured Al at the interface with a photoactive layer excited the propagating surface plasmons. Compared with a flat reference device, the proposed OSCs exhibited improved photovoltaic properties by increasing both the short-circuit current density (JSC) and the power conversion efficiency (PCE) with large enhancements of 16.23% and 14.06%, respectively. The efficiency improvement was attributed to increased broadband absorption and improved electrical properties inside the thin-film devices.

    DOI: 10.1080/15421406.2020.1741822

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  • Enhancement of organic solar cell performance by incorporating gold quantum dots (AuQDs) on a plasmonic grating 査読

    Sopit Phetsang, Supeera Nootchanat, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Pitchaya Mungkornasawakul, Kontad Ounnunkad, Akira Baba

    Nanoscale Advances   2 ( 7 )   2950 - 2957   2020年7月

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    掲載種別:研究論文(学術雑誌)  

    © The Royal Society of Chemistry. The incorporation of metallic nanoobjects into devices allows to increase light harvesting, which increases the device performance. In this study, we used a combination of gold quantum dots and grating-coupled surface plasmon resonance (GCSPR) to improve the performance of organic solar cells (OSCs) with a poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl C61 butyric acid methyl ester (PCBM) photoactive layer. Gold quantum dots with a green fluorescent color (green-AuQD) were loaded into a hole transport layer (HTL) aiming to harvest photons in the UV region and emit visible light into the neighboring photoactive layer. Meanwhile, plasmonic grating structures, which were created on the photoactive layer surfaces via the nanoimprinting technique, provided an enhancement effect through light scattering and GCSPR. Thus, an excellent enhancement of OSC efficiency with a significant increase in short circuit photocurrent (JSC) and power conversion efficiency (PCE) in comparison to that of the reference cell was achieved. The fabricated device provides a JSC value as high as 8.41 mA cm-2 (a 14.11% enhancement) and a PCE value of 3.91% (a 19.57% enhancement). The systematic study clearly reveals that the remarkable enhancement of OSC efficiency is achieved by incorporating both AuQD and plasmonic grating.

    DOI: 10.1039/d0na00169d

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  • Improvement of organic field-effect transistor characteristics via oxidation treatment of Ag nano-ink electrode surfaces 査読

    Masahiro Minagawa, Kanta Kobayashi, Shinnosuke Sone, Kazunari Shinbo

    Japanese Journal of Applied Physics   59 ( SC )   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    © 2019 The Japan Society of Applied Physics. Organic field-effect transistors (OFETs) containing surface oxidized Ag nano-ink electrodes were fabricated in order to investigate their electrical properties. OFETs having gate electrode/n-type Si wafer/SiO2 treated with octadecyltrichlorosilane/Ag nano-ink source-drain electrodes/deposited 9,10-diphenylanthracene (DPA) layer stacked structures were fabricated. The silver nano-ink electrodes were oxidized by exposure to ultraviolet light (184.9 and 253.7 nm) before DPA-layer deposition. The OFETs having unoxidized electrodes failed to operate, while the drain currents of the OFETs with oxidized electrodes increased with oxidation time. The largest drain current (-269 μA) was obtained for the OFET with an electrode oxidation time of 600 s, which resulted in a reduction in the contact resistance to 9.5 kΩ cm despite the large ionization potential of the DPA layer (∼5.8 eV). The observed behavior is attributed to the oxidized Ag electrodes enhancing hole injection by oxidizing the surface of the DPA layer.

    DOI: 10.7567/1347-4065/ab48cb

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  • Controlling the Luminescence of Gold Quantum Dots by the Plasmonic Effect of Silver Nanoprisms 査読

    Chutiparn Lertvachirapaiboon, Itaru Kiyokawa, Akira Baba, Kazunari Shinbo, Keizo Kato

    Plasmonics   15 ( 1 )   3 - 9   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    © 2019, Springer Science+Business Media, LLC, part of Springer Nature. Plasmonic nanostructures can be used to control the photoluminescence properties of various emitting materials. In this work, an efficient plasmon-induced energy transfer (quenching) was investigated. The luminescence intensity of gold quantum dots (AuQDs) was controlled by the localized surface plasmon resonance of silver nanoprisms (AgNPrs). The quenching was modulated by the degree of spectral overlap between the photoluminescence band of AuQDs and the dipole plasmon resonance of AgNPrs. Furthermore, an in situ controlled quenching effect of AuQDs using an oxidative etching reaction of AgNPrs by hydrogen peroxide (H2O2) was demonstrated. This technique was further developed for application as a H2O2 sensor. This system was capable of detecting 1 nM H2O2 in an aqueous solution.

    DOI: 10.1007/s11468-019-01006-8

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  • Long-range surface plasmon resonance enhanced transmission of light through silver-coated Cytop gratings 査読

    Chutiparn Lertvachirapaiboon, Kazushi Chibana, Akira Baba, Kazunari Shinbo, Keizo Kato

    Japanese Journal of Applied Physics   59 ( SC )   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    © 2019 The Japan Society of Applied Physics. In this study, transmission surface plasmon resonance (TSPR) signal of a silver-coated Cytop grating/glass slide substrate was investigated in combination with a hyperspectral imaging technique. The TSPR excitation peaks, corresponding to surface plasmon (SP) dispersion modes of +2 (-SP+2) and -1 (+SP-1), were simultaneously observed. The TSPR signal of -SP+2 mode at the visible light region was further enhanced by increasing Cytop thickness. A 2-time stronger in TSPR intensity of the developed substrate than that of conventional silver-coated polycarbonate grating substrate was observed. Since the structure of the substrate was the silver film bound by Cytop and water that had similar dielectric constants, this enhancement was due to a long-range SP resonance effect. TSPR hyperspectral image of developed substrate while injecting different concentrations of ethylene glycol solutions into a five-microchannel assembled to the substrate were recorded and TSPR hyperspectra were then plotted to acquire the sensitivity of this technique. This technique gave a sensitivity of 315.0 nm RIU-1. According to the sensitive changes of TSPR hyperspectral image to the refractive index of an environment, this technique showed high potential with respect to further development of sensing devices based TSPR imaging system.

    DOI: 10.7567/1347-4065/ab48c9

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  • Self-assembly of fluorescent nanospheres on nanostructured azo molecular thin films and optical near-field excitation 査読

    Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato

    Japanese Journal of Applied Physics   59 ( SC )   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    © 2019 The Japan Society of Applied Physics. We demonstrate self-assembly of fluorescent polymer nanospheres on a nanostructured azobenzene molecular thin film, and evaluate optical near-field excitation of aligned nanospheres. Nanogratings on azo thin film optically fabricated utilizing standing evanescent waves were used for an alignment layer of nanospheres. After dropping and air-drying a solution of nanospheres, the nanospheres were aligned along the grooves of nanograting. The variations in distribution of nanospheres were observed for a choice of grating shape and dispersing solvent of nanospheres. The size ordered alignment of nanospheres was found by using spin coating. To evaluate the fundamental processes of optical near-field excitation of the nanospheres, the emission light from the fluorescent nanospheres periodically aligned on azo grating was observed. The angular distribution of emission lights at a prism side of the angles larger than critical angle was confirmed, which correspond to the near-field optical excitation mediated by evanescent waves radiated near nanospheres.

    DOI: 10.7567/1347-4065/ab4cfd

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  • Detection of creatinine using silver nanoparticles on a poly(pyrrole) thin film-based surface plasmon resonance sensor 査読

    Chammari Pothipor, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba

    Japanese Journal of Applied Physics   59 ( SC )   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    © 2019 The Japan Society of Applied Physics. Surface plasmon resonance (SPR) technique is a great tool to investigate the binding of analyte to functionalized surfaces and the immobilization of biomolecules. Creatinine is one of the biomarkers for monitoring renal functions and making a diagnosis of kidney disease. Elevated creatinine levels in the human body signifies impaired kidney disease. In this work, we developed a new strategy for creatinine detection using starch stabilized silver nanoparticles (starch-AgNPs) on poly(pyrrole) (PPy) thin film using the SPR technique. The assay exhibited the obvious change from yellow to orange color of AgNPs solution in the presence of creatinine, showing good sensitivity due to the localized plasmon effect of AgNPs. Based on this effect, the change of SPR reflectivity in the Kretschmann configuration was enhanced by the adsorption of AgNPs in the presence of creatinine on the PPy film. The SPR reflectivity upon the injection of the mixed solution on the PPy thin film increased with increasing creatinine concentration in the linear range from 10 to 1000 μM. As a comparison, performances of the creatinine sensor with three SPR sensor systems, i.e. only PPy film, PPy film with AgNPs, and PPy film with aggregated AgNPs, were studied. The SPR sensor with aggregated AgNPs was improved approximately four times compared with the substrate without aggregated AgNPs, and the limit of the detection was 0.19 μM. The proposed method is potentially useful for clinical applications.

    DOI: 10.7567/1347-4065/ab4a94

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  • Colorimetric Determination Of Hydrogen Peroxide Based on Localized Surface Plasmon Resonance of Silver Nanoprisms Using a Microchannel Chip 査読

    Chutiparn Lertvachirapaiboon, Itaru Kiyokawa, Akira Baba, Kazunari Shinbo, Keizo Kato

    Analytical Letters   52 ( 12 )   1939 - 1950   2019年8月

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    掲載種別:研究論文(学術雑誌)  

    © 2019, © 2019 Taylor & Francis Group, LLC. Silver nanoprisms (AgNPrs) have unique optical phenomena due to their localized surface plasmon resonance that results in the extinction of light from the visible to the near-infrared spectral region. In this study, we propose the colorimetric determination of silver nanoprisms in microchannels using a smartphone camera. Image acquisition was performed by capturing an image of the colloidal solution of the silver nanoprisms in the microchannel using the transmitted light. Red, green, and blue chromaticity levels were extracted from the recorded images for further quantification of the silver nanoprisms. This technique was employed for the detection and colorimetric determination of hydrogen peroxide (H2O2). Good linearity between the change in the green chromaticity level and concentration of hydrogen peroxide was observed for values from 10 to 300 μM with an R2 value of 0.9670. We anticipate that the developed methodology for the quantification of silver nanoprisms and hydrogen peroxide by monitoring the change in color in the images of transmitted light will enhance the development of simple, rapid, and reliable detection systems for quality control in the production of silver nanoprisms as well as in chemical sensor applications.

    DOI: 10.1080/00032719.2019.1586913

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  • Plasmonic-Enhanced Photocurrent Generation of Organic Photovoltaics Induced by 1D Grating and 2D Crossed Grating Structures 査読

    Nootchanat Supeera, Phengdaam Apichat, Ishikawa Ryousuke, Lertvachirapaiboon Chutiparn, Shinbo Kazunari, Kato Keizo, Ekgasit Sanong, Baba Akira

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   19 ( 8 )   4727 - 4731   2019年8月

  • Effect of Micro/Nanostructured P3HT:PCBM Surfaces on the Performance of Organic Photovoltaic Devices 査読

    Thitirat Putnin, Supeera Nootchanat, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba

    Molecular Crystals and Liquid Crystals   688 ( 1 )   89 - 97   2019年7月

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    掲載種別:研究論文(学術雑誌)  

    © 2019, © 2019 Taylor & Francis Group, LLC. In this study, the effect of periodic patterned micro/nanostructures on the active layers of thin-film organic photovoltaics (OPVs) was investigated to improve the device performance. The patterned active layer structures were fabricated by a nanoimprinting technique using different templates, including compact disc recordable (CD-R), Blu-ray disc recordable (BD-R), nanowell arrays, nanodot arrays, and honeycomb structures. The OPVs consisted of Al/nanostructured P3HT:PCBM/PEDOT:PSS/ITO. Compared with a flat reference OPV, all the micro/nanostructured OPVs exhibited higher performances, originating from enhanced light absorption due to light scattering and surface plasmon excitation at the patterned Al/P3HT:PCBM interfaces.

    DOI: 10.1080/15421406.2019.1651073

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  • Enhanced organic solar cell performance: Multiple surface plasmon resonance and incorporation of silver nanodisks into a grating-structure electrode 査読

    Thitirat Putnin, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Sanong Ekgasit, Kontad Ounnunkad, Akira Baba

    Opto-Electronic Advances   2 ( 7 )   190010-1 - 190010-11   2019年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.29026/oea.2019.190010

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  • Simultaneous detection of ammonia and humidity using transmission surface plasmon resonance technique 査読

    Tomohiro Takano, Chutiparn Lertvachirapaiboon, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato

    Molecular Crystals and Liquid Crystals   685 ( 1 )   93 - 99   2019年5月

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    掲載種別:研究論文(学術雑誌)  

    © 2019, © 2019 Taylor & Francis Group, LLC. Gas sensing by using the transmission surface plasmon resonance (T-SPR) technique was demonstrated. Polyacrylic acid (PAA)/5-nm-thick gold/40-nm-thick silver/polycarbonate grating substrate structure (Sensor A) responded to ammonia; however, it exhibited a strong humidity dependence. Polyvinyl alcohol (PVA)/5-nm-thick gold/40-nm-thick silver/polycarbonate grating substrate structure (Sensor B) as the sensing material was also prepared and it mainly responded to humidity. The T-SPR properties of Sensors A and B were observed simultaneously by a stacking arrangement that enabled us to obtain the responses by using a single spectrophotometer. The ammonia concentration under various humidity conditions could be accurately obtained by simultaneous measurement of Sensors A and B.

    DOI: 10.1080/15421406.2019.1645466

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  • Fabrication of Miniature Surface Plasmon Resonance Sensor Chips by Using Confined Sessile Drop Technique 査読

    Supeera Nootchanat, Wisansaya Jaikeandee, Patrawadee Yaiwong, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Sanong Ekgasit, Akira Baba

    ACS Applied Materials and Interfaces   11 ( 12 )   11954 - 11960   2019年3月

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    掲載種別:研究論文(学術雑誌)  

    © 2019 American Chemical Society. In this study, we demonstrate a simple and efficient method to fabricate miniature surface plasmon resonance (SPR) sensor chips by using confined sessile drop technique. A liquid optical adhesive (NOA 61) was dropped on the circular flat surface of cylindrical substrates made of poly(dimethylsiloxane) (PDMS). The formation of hemispherical optical prisms was accomplished by taking advantage of the sharp edges of cylindrical PDMS substrates that prevented the overflow of liquid NOA 61 at the edge of substrates. The size of the hemispherical optical prisms can be controlled by changing the diameter of the cylindrical PDMS substrates. After UV curing, the SPR sensor chips were obtained by the deposition of 3 nm thick chromium and 47 nm thick gold on the flat side of the prisms. The fabricated miniature SPR sensor chips were then mounted on a three-dimensional-printed flow cell to complete the microfluidic SPR sensor module. The miniature SPR sensor chips provided a comparable sensitivity to the conventional high-refractive-index glass SPR chips. To demonstrate the detection capability of nanometer-sized materials, we applied the miniature microfluidic SPR system for monitoring the deposition of layer-by-layer ultrathin films of poly(diallyldimethylammonium chloride)/poly(sodium 4-styrenesulfonate) and for detecting human immunoglobulin G.

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  • Optically reversible deformation of azobenzene particles prepared by a colloidal method 査読

    Yasuo Ohdaira, Yuki Ikeda, Hisaki Oka, Kazunari Shinbo

    Journal of Applied Physics   125 ( 10 )   2019年3月

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    掲載種別:研究論文(学術雑誌)  

    © 2019 Author(s). Optical reversibility of deformation of azobenzene particles prepared by a colloidal method is demonstrated. Linearly polarized laser light modifies the shape of the azo particles through photoisomerization of the azo molecules. We found that the oblique incidence of a single laser beam can reversibly deform the azo particles into shapes, including spherical, elliptical, and rod shapes, through simple adjustment of the polarization direction and irradiation time of the laser light. The direction of the long axis of the ellipsoid was sequentially controlled by selecting the polarization direction of obliquely incident laser light, although the normal incidence never rotated the ellipsoidal direction under any polarization direction. The reversibility of the changes in the azo particle shape was confirmed in cyclic optical deformation experiments.

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  • Optical sensing platform for the colorimetric determination of silver nanoprisms and its application for hydrogen peroxide and glucose detections using a mobile device camera 査読

    Chutiparn Lertvachirapaiboon, Takuya Maruyama, Akira Baba, Sanong Ekgasit, Kazunari Shinbo, Keizo Kato

    Analytical Sciences   35 ( 3 )   271 - 276   2019年

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    掲載種別:研究論文(学術雑誌)  

    © 2019 The Japan Society for Analytical Chemistry. Silver nanoprisms (AgNPrs) have a unique localized surface plasmon resonance, resulting in strong absorption and scattering within the visible light region. In this work, we propose image acquisition from colloidal solutions of AgNPrs using a combination of transmitted and scattered light. The developed measurement technique could be carried out by separately recording transmitted and scattering images of the solutions, using a mobile device camera prior to a calculation of the empirical absorption value (IA). The IA value of green for AgNPrs solutions was found to be in agreement with the absorption spectra obtained using a conventional spectroscopic technique. This technique was utilized for the quantifications of hydrogen peroxide and glucose. Good linearities between ΔIA and those typical analytes were observed. The limit of detection for the typical biosensor of glucose was 19.8 μM. As such, we expect the methodology herein developed for hydrogen peroxide and glucose determinations by means of monitoring the color change of transmitted and scatting images from solutions to contribute to the development of simple, rapid, and reliable detection systems to be further applied to biochemical analysis and clinical diagnosis, as well as to household biosensor applications.

    DOI: 10.2116/analsci.18P412

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  • Hybrid sensors using a quartz crystal microbalance and surface plasmon resonance for evaluating thin film structure and liquid properties 招待

    Kazunari Shinbo, Chutiparn Lertvachirapaiboon, Yasuo Ohdaira, Akira Baba, Keizo Kato

    Optics InfoBase Conference Papers   Part F138-ACPC 2019   2019年

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(国際会議プロシーディングス)  

    Asia Communications and Photonics Conference (ACP) © OSA 2019 © 2019 The Author(s) Hybrid sensors combining a quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) were developed. The simultaneous measurement of the QCM and SPR signals allowed evaluating the swelling of polymer film and liquid properties. © 2019 K. Shinbo, C. Lertvachirapaiboon, Y. Ohdaira, A. Baba and K. Kato.

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  • Detection of Human Immunoglobulin G by Transmission Surface Plasmon Resonance Using the In Situ Gold Nanoparticle Growth Method. 査読

    Theerasak Juagwon, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Toemsak Srikhirin, Tanakorn Osotchan, Akira Baba

    IEICE Trans. Electron.   102-C ( 2 )   125 - 131   2019年

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  • Characteristics of 9,10-diphenylanthracene field-effect transistors obtained by exposing the silver electrodes to oxidative conditions 査読

    Masahiro Minagawa, Shinnosuke Sone, Kanta Kobayashi, Martin Claus, Kazunari Shinbo

    Japanese Journal of Applied Physics   58 ( SB )   2019年

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    掲載種別:研究論文(学術雑誌)  

    © 2019 The Japan Society of Applied Physics. Organic field-effect transistors (OFETs) containing a 9,10-diphenylanthracene (DPA) layer were fabricated with oxidized silver (AgOx) electrodes, and their electrical properties were investigated. The OFET structure consisted of heavily doped n-type Si wafers (SiO2) as the gate dielectric layer, fabricated silver source-drain electrodes oxidized by ultraviolet-ozone surface treatment, and finally the DPA layer. In spite of the large ionization potential of the DPA layer (∼5.8 eV), a high mobility (∼1.1 cm2 V-1 s-1)) was measured for OFETs with a AgOx layer oxidized for 600 s, which resulted in a reduction in the contact resistance to 8.0 kΩ cm. The observed behavior was attributed to the fact that the AgOx layer with its high oxidizability contributed to hole injection by oxidizing the surface of the DPA layer. Moreover, hole injection was more strongly enhanced by the presence of Ag2O rather than AgO.

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  • Investigation of a gold quantum dot/plasmonic gold nanoparticle system for improvement of organic solar cells 査読

    Sopit Phetsang, Apichat Phengdaam, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Pitchaya Mungkornasawakul, Kontad Ounnunkad, Akira Baba

    Nanoscale Advances   1 ( 2 )   792 - 798   2019年

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    掲載種別:研究論文(学術雑誌)  

    © 2019 The Royal Society of Chemistry. Light management allows enhancement of light harvesting in organic solar cells (OSCs). In this paper, we describe the investigation of OSCs enhanced by the synergistic effect of gold quantum dots (AuQDs) and localized surface plasmons, obtained by blending a AuQD layer and plasmonic gold nanoparticles (AuNPs) in a hole-transport layer (HTL). Different AuQDs emitting blue, green, and red fluorescence were examined in this study. The OSCs were demonstrated to comprise an ITO-coated glass substrate/AuQDs/PEDOT:PSS:AuNPs/P3HT:PCBM/Al structure. The UV-visible spectra, current density versus voltage characteristics, impedance spectra, and incident photon-to-current efficiency of the fabricated devices were evaluated. The results showed an enhancement of photovoltaic efficiency achieved as a result of the increase in short-circuit current density (Jsc) and power conversion efficiency (PCE) in comparison with those of the reference OSCs. The best synergistic effect was found with OSCs consisting of a green-emitting AuQD layer and a HTL containing AuNPs, resulting in the highest improvement in PCE of 13.0%. This indicated that the increase in light harvesting in the developed devices was induced by extended light absorption in the UV region resulting from absorption by the AuQD layer and emission of visible fluorescence from the AuQD layer to the photoactive layers. Moreover, the localized surface plasmon effect of AuNPs, which also contributed to an increase in light trapping in the proposed OSCs, was enhanced by the effect of the AuQDs.

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  • Controlling Surface Plasmon Optical Transmission by Stretching a Silver-Coated Elastomeric Grating Substrate 査読

    Chutiparn Lertvachirapaiboon, Yuya Ito, Akira Baba, Kazunari Shinbo, Keizo Kato

    Plasmonics   13 ( 6 )   2417 - 2421   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer New York LLC  

    © 2018, Springer Science+Business Media, LLC, part of Springer Nature. In this study, transmission surface plasmon resonance (TSPR) of a silver-coated elastomeric grating substrate was tuned via mechanical stretching. The wavelengths of TSPR excitation peaks, corresponding to surface plasmon dispersion modes of + 1 and − 1, were simultaneously observed. The TSPR excitation wavelength was dramatically shifted up to 80 nm when the strain of the substrate reached 13.3%. The fine control of TSPR properties of the silver-coated elastomeric grating substrate has potential applications in mechanically tunable band pass filters, optical sensors, etc.

    DOI: 10.1007/s11468-018-0768-5

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  • A smartphone-based surface plasmon resonance platform 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    Analytical Methods   10 ( 39 )   4732 - 4740   2018年10月

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    掲載種別:研究論文(学術雑誌)  

    © 2018 The Royal Society of Chemistry. Surface plasmon resonance (SPR) originates from collective oscillation of electron density and associated electromagnetic field at a metal/dielectric interface. Reflection SPR, which includes prism-coupling and grating-coupling methods, and transmission SPR (TSPR) have been developed for use in a smartphone sensing platform. The strength of this approach relies on the SPR phenomenon: the strong electromagnetic oscillation of electrons that can occur at a metal/dielectric interface and is highly sensitive to changes in the localized dielectric on the metal surface. The observable SPR signals are strong enough to detect with a simple camera. By combining the SPR phenomenon with the high performance of a smartphone camera, smartphone-based SPR platforms have been developed for use in on-site and remote detection of biomedical and environmental samples, point-of-care devices, and practical use in household devices. This review gives an overview of smartphone-based SPR platforms in both reflection SPR and TSPR configurations, the design of the devices, and the typical setup used to acquire spectroscopic information and SPR images, as well as providing some examples of their use in the analysis of chemical and biological samples.

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  • Transmission surface plasmon resonance image detection by a smartphone camera 査読

    Chutiparn Lertvachirapaiboon, Chammari Pothipor, Akira Baba, Kazunari Shinbo, Keizo Kato

    MRS Communications   8 ( 3 )   1279 - 1284   2018年9月

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    掲載種別:研究論文(学術雑誌)  

    Copyright © Materials Research Society 2018. A transmission surface plasmon resonance image (TSPRi) obtained with a plasmonic grating structure was investigated in combination with a smartphone camera. A substrate of a gold-coated CYTOP grating/glass slide showed the TSPR excitation wavelength of 675 nm at the incident light angle of 30°. The TSPRi acquired from a smartphone camera assembled with liquid crystal tunable filters corresponded with spectroscopic results. The sensitivity of this technique was 282/RIU. Due to changes in the sensitivity of the TSPRi intensity to the refractive index of the environment, this technique can be further developed for portable devices for sensor applications.

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  • Surface plasmon resonance-enhanced photoelectrochemical sensor for detection of an organophosphate pesticide chlorpyrifos 査読

    Treenet Thepudom, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Teerakiat Kerdcharoen, Akira Baba

    MRS Communications   8 ( 1 )   107 - 112   2018年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cambridge University Press  

    © Copyright Materials Research Society 2017. Detection of chlorpyrifos (CPF) using a surface plasmon resonance (SPR)-enhanced photoelectrochemical sensing system is demonstrated in this study. The presence of CPF was detected based on an increase in the short-circuit photocurrent when a sample is injected into the electrolyte at different concentrations. The short-circuit photocurrent signal was enhanced by both localized SPR of the gold nanoparticles and by the effects of grating-coupled propagating SPR. Using the hybrid SPR-enhancement system, CPF detection was achieved at concentrations as low as 7.5 nM. The proposed technique of leveraging a multifunctional photovoltaic effect can be used for a variety of sensing applications.

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  • Development of graphene oxide/poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) thin film-based electrochemical surface plasmon resonance immunosensor for detection of human immunoglobulin G 査読

    Chammari Pothipor, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Kontad Ounnunkad, Akira Baba

    Japanese Journal of Applied Physics   57 ( 2 )   2018年2月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Japan Society of Applied Physics  

    © 2018 The Japan Society of Applied Physics. An electrochemically synthesized graphene oxide (GO)/poly(3,4-ethylenedioxythiophene) (PEDOT)/poly(styrene sulfonate) (PSS) thin film-based electrochemical surface plasmon resonance (EC-SPR) sensor chip was developed and employed for the detection of human immunoglobulin G (IgG). GO introduced the carboxylic group on the film surface, which also allowed electrochemical control, for the immobilization of the anti-IgG antibody via covalent bonding through amide coupling reaction. The SPR sensitivity of the detection was improved under the control by applying an electrochemical potential, by which the sensitivity was increased by the increment in applied potential. Among the open-circuit and different applied potentials in the range of -1.0 to 0.50 V, the EC-SPR immunosensor at an applied potential of 0.50 V exhibited the highest sensitivity of 6.08 × 10-3 mL μg-1 cm-2 and linearity in the human IgG concentration range of 1.0 to 10 μg mL-1 with a relatively low detection limit of 0.35 μg mL-1. The proposed sensor chip is promising for immunosensing at the physiological level.

    DOI: 10.7567/JJAP.57.02CA07

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  • Transmission surface plasmon resonance techniques and their potential biosensor applications 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    Biosensors and Bioelectronics   99   399 - 415   2018年1月

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    記述言語:英語   出版者・発行元:ELSEVIER ADVANCED TECHNOLOGY  

    © 2017 Elsevier B.V. Transmission surface plasmon resonance (TSPR) is an unusual extraordinary optical transmission that is more transparent at certain wavelengths than expected by classical theory. The three main plasmonic structures that providing this phenomenon are nanohole arrays, diffraction gratings, and nanoslit arrays. This extraordinary optical transmission phenomenon is produced as a result of surface plasmon excitations. The shifting in TSPR responses upon changing of dielectric environment at the surface of a metallic film was observed. After TSPR was discovered from metallic nanohole arrays in 1998, the number of papers about this topic rapidly increased. In the 20 years since, TSPR has been utilized to improve the detection limits, sensitivity, selectivity, and dynamic range of biosensing devices, resulting in them having greater potential for commercialization. This review gives a broad overview of the TSPR phenomenon, the development of this technique, and the typical experimental setups used to acquire TSPR signals; it also describes how they are applied in the field of research into biosensors.

    DOI: 10.1016/j.bios.2017.07.069

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  • Development of an electrochemical-surface plasmon dual biosensor based on carboxylated conducting polymer thin films 査読

    Saengrawee Sriwichai, Rapiphun Janmanee, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Tadashi Yamamoto, Akira Baba

    Journal of Applied Polymer Science   135 ( 1 )   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    © 2017 Wiley Periodicals, Inc. A biosensing platform based on the covalent attachment of biomolecules on electropolymerized carboxylated conducting polymers, poly(3-aminobenzoic acid) and poly(3-pyrrole carboxylic acid), were developed for the selective simultaneous detection of two biomolecules using electrochemical-surface plasmon resonance (EC–SPR) spectroscopy. The surface morphology of the developed biosensors was studied by scanning electron microscopy and atomic force microscopy. The EC–SPR dual biosensor was developed for the label-free, simultaneous, and selective detection of glucose and human immunoglobulin G (IgG). A change in current density was clearly observed after the injection of glucose, whereas a change in SPR reflectivity was clearly observed after the injection of human IgG. The present work demonstrates the potential of this biosensing platform for real sample analysis in the future. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45641.

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  • Long-range surface plasmon excitation and photoisomerization of Azobenzene dye 査読

    Hiroshi Nakajo, Chutiparn Lertvachirapaiboon, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Kazunari Shinbo

    Molecular Crystals and Liquid Crystals   660 ( 1 )   156 - 162   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Taylor and Francis Inc.  

    © 2018 Taylor & Francis Group, LLC. Enhancement of photoisomerization of Azobenzene dye Chicago Sky Blue 6B (CSB) was attempted using long-range surface plasmon resonance (LRSPR). The CSB film was prepared on a grating substrate with metal film for LRSPR, and its transmission light property was investigated before and after white light irradiation for photoisomerization. The transmission light was markedly changed by irradiation of p-polarized white light, and the change was attributed to photoisomerization of CSB induced by LRSPR which accompanies an intense electric field. Furthermore, the effect of LRSPR was significant compared to standard SPR.

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  • Development of an electrochemical-surface plasmon dual biosensor based on poly(3-aminobenzoic acid) and polyelectrolyte thin films 査読

    Saengrawee Sriwichai, Rapiphun Janmanee, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Tadashi Yamamoto, Akira Baba

    Journal of Applied Polymer Science   Vol. 135   45641 (1) - 45641 (10)   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Effect of Al-pillar nanostructures on organic thin film solar cells 査読

    Apichat Phengdaam, Jing Yang, Jiabao Li, Minghui Hong, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Ryousuke Ishikawa, Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit

    EFM 2018   2018年1月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Transmission surface plasmon resonance imaging based on gold grating/silver nanoparticles for detection of creatinine 査読

    Chammari Pothipor, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Kontad Ounnunkad, Akira Baba

    Proceedings of the International Symposium on Electrical Insulating Materials   2   461 - 463   2017年12月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    © 2017 Institute of Electrical Engineers of Japan. All rights reserved. In diagnostics analysis, creatinine is a biomarker for the evaluation of renal and muscular dystrophy in various biology and closely related to the life activities of the organism. In this research, we investigated the transmission surface plasmon resonance-imaging (TSPR-i) with a 3-channel microfluidic cell. TSPR-i based on the exploitation of propagating SPR is the technique for monitoring the changes in surface plasmon resonance of gold film on both glass slide substrates and diffraction gold grating substrates to their surrounding environments in transmission configuration. The silver nanoparticles (AgNPs) were deposited with poly (diallydimethylammonium chloride) (PDADMAC) and poly (sodium 4-styrenesulfonate) (PSS) using layer-by-layer (LbL) technique on gold thin film grating/substrate surfaces for the detection of creatinine. In this experiment, the TSPR-i signal was detected by a camera coupled with liquid crystal tunable filters (LCTF). The TSPR-i signal of Au grating dominated at the incident angle of ∼35 degree and a strong excitation wavelength was observed at ∼720 nm. After the deposition of AgNPs on the gold grating substrate, the TSPR-i intensity decreased and then increased again when incubated with creatinine for 1 h. In addition, TSPR-i technique was used to study the effect of localized surface plasmon resonance (LSPR) from plasmonic AgNPs on the gold-grating/dielectric interface for the signal enhancement of creatinine. The 5-bilayer of AgNPs/PDADMAC film onto 10 bi-layer of PDADMAC/PSS intermediate layers on BK7 glass slides before and after injection of creatinine was studied by UV-vis absorption spectroscopy. The creatinine sensor exhibited good sensitivity toward the determination of creatinine and showed a linear calibration range from 0.1 to 20 mM. A simple, and costeffective method has been demonstrated on the TSPR imaging system for real-time, label-free, good sensitive which will be potentially useful for clinical applications.

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  • Investigation of Gold Quantum Dot Enhanced Organic Thin Film Solar Cells 査読

    Apichat Pangdam, Supeera Nootchanat, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sanong Ekgasit, Akira Baba

    Particle and Particle Systems Characterization   34 ( 11 )   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

    © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Gold quantum dots (AuQDs) are employed as photosensitizers in organic thin-film solar cells (OSCs) to improve their photoelectric conversion properties. Three types of AuQDs with different fluorescence emission wavelengths are used: blue (B-AuQDs), green (G-AuQDs), and red (R-AuQDs). AuQDs are loaded into the poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) thin-film layer of OSCs. UV–vis spectra, atomic force microscope images, current density–voltage characteristics, and impedance spectra of the fabricated devices are measured for the three aforementioned types of AuQDs. All types of AuQDs improve the photoelectric conversion properties, and the G-AuQD-loaded OSCs exhibit the best improvement, exhibiting an efficiency increase of 10% compared with OSCs without the AuQDs. The fluorescence/photosensitization of the AuQDs plays an important role in the enhancement of the OSCs. Finite-difference time-domain simulations indicate increased electric field intensity due to a small degree of AuQDs aggregation.

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  • Transmission surface plasmon resonance imaging of silver nanoprisms enhanced propagating surface plasmon resonance on a metallic grating structure 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    SENSORS AND ACTUATORS B-CHEMICAL   249   39 - 43   2017年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The localized surface plasmon resonance of in-plane dipole plasmon resonance of silver nanoprisms was used to facilitate transmission surface plasmon resonance (TSPR). The TSPR signal was detected by a camera coupled with liquid crystal tunable filters. This technique was further utilized for the multiple detection of hydrogen peroxide. (C) 2017 Elsevier B.V. All rights reserved.

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  • Grating-coupled surface plasmon resonance enhanced organic photovoltaic devices induced by Blu-ray disc recordable and Blu-ray disc grating structures 査読

    Supeera Nootchanat, Apichat Pangdam, Ryousuke Ishikawa, Kanet Wongravee, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sanong Ekgasit, Akira Baba

    Nanoscale   9 ( 15 )   4963 - 4971   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry  

    In this work, we studied the performance enhancement of organic thin-film solar cells (OSCs) originating from the presence of diffraction gratings on the surface of the active layer. Two types of diffraction gratings, periodic gratings (Blu-ray disc recordable: BD-R) and quasi-random gratings (Blu-ray disc: BD), were employed as master templates for grating structures. The grating structures were introduced to the surfaces of poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) films, which were the active layers of the solar cells. The addition of the grating structures led to an increase of light absorption in the absorption region of P3HT:PCBM induced by light scattering. Furthermore, the grating-coupled surface plasmon resonance generated additional light absorption peaks. With illumination of non-polarized light at a normal incident angle, the short-circuit current densities of the BD-R and BD solar cells improved by 11.05% and 10.6%, respectively. Efficiency improvements of 19.28% and 3.21% were also observed for the BD-R and BD devices, respectively. Finally, the finite-difference time-domain simulation results revealed an enhanced electric field in the P3HT:PCBM layer, especially in the BD-R OSC devices.

    DOI: 10.1039/c6nr09951c

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  • Ammonia Gas Detection under Various Humidity Conditions Using Waveguide Surface Plasmon Resonance Spectroscopy 査読

    Kazunari Shinbo, Ryo Komai, Hiroki Honda, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    ANALYTICAL SCIENCES   33 ( 4 )   443 - 447   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC ANALYTICAL CHEMISTRY  

    Analysis of NH3 gas under various humidity conditions was conducted using a waveguide surface plasmon resonance (SPR) sensor with dual sensing parts. Two pairs of Ag films/sensing polymer films were prepared separately on a waveguide core of BK-7 slide glass. Poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) were used as sensing materials. A white light was guided through the core by illuminating the substrate edge, and the SPR property was investigated by observing the output light spectrum. The thicknesses of PAA and PVA films were adjusted to induce SPR at different wavelengths. PAA exhibited remarkable response against NH3 gas, but it also exhibited a strong dependence on humidity. In contrast, PVA responded to humidity but hardly responded to NH3 gas below 20 ppm. The dual sensing would allow us to conduct precise NH3 measurements under various humidity conditions.

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  • Judging Degradation of Lithium-Ion Batteries Using a Real-Time Capacitance Measurement 査読

    Futao Kaneko, Takahiro Kawakami, Kazunari Shinbo, Akira Baba, Keizo Kato, Shigetoshi Miyazaki, Koichi Shimizu, Kenichi Sato, Osamu Hanaoka

    ELECTRICAL ENGINEERING IN JAPAN   199 ( 2 )   10 - 16   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    A novel method was proposed to judge degradation/health of lithium-ion batteries (LIBs) using the capacitance that was estimated from the real-time voltage and current characteristics of the batteries. It is thought that the capacitance of LIBs decreases with degradation because of undesirable components formed on the electrodes that are the main cause of the degradation. As the LIBs are active, the capacitance was evaluated from the differential equation, Q/v = I/(v/t) = i/(dv/dt), using the voltage and current characteristics during the charging or discharging. The capacitances of the commercial LIBs with different SOHs; 100%, 92%, and 88% were estimated during the charging and discharging using the equation. The average capacitance in the specific voltage region of the batteries was directly proportional to the state of health. Therefore, the proposed measurement is thought to be a useful method for judging degradation of LIBs. (C) 2017 Wiley Periodicals, Inc.

    DOI: 10.1002/eej.22962

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  • Inverted organic solar cells enhanced by grating-coupled surface plasmons and waveguide modes 査読

    Kazuma Hara, Chutiparn Lertvachirapaiboon, Ryousuke Ishikawa, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Akira Baba

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   19 ( 4 )   2791 - 2796   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    In this study, we demonstrate improved photovoltaic properties in inverted organic thin-film solar cells by simultaneous excitation of grating-coupled surface plasmons and grating-coupled waveguide modes on gold grating surfaces. The cell consists of a glass-ITO substrate/titanium dioxide/poly(3-hexylthiophene-2,5-diyl): phenyl-C61-butyric acid methyl ester/poly(3,4-ethylenedioxythiophene): poly( styrene sulfonate)/gold structure. The grating structures were fabricated on P3HT: PCBM layers using a nanoimprinting technique with a PDMS stamp. The grating-structured PDMS stamps were fabricated using a DVD-R grating template with a grating pitch, Lambda, of 740 nm. Reflectivity measurements made using p-polarized light clearly indicate 2 types of excitation modes, i.e., surface plasmons and waveguide modes, while s-polarized light produces only waveguide modes. Incident photon-to-current efficiency measurements exhibited increased photocurrent wavelengths corresponding to the wavelengths of surface plasmon excitations and waveguide mode excitations. Through the simultaneous excitation of surface plasmons and waveguide modes, short-circuit photocurrents in the grating-structured cells exhibited an improvement of up to 11% in the solar cells, leading to an efficiency increase of 16%.

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  • Microfluidic transmission surface plasmon resonance enhancement for biosensor applications 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 1 )   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    The microfluidic transmission surface plasmon resonance (MTSPR) constructed by assembling a gold-coated grating substrate with a microchannel was employed for biosensor application. The transmission surface plasmon resonance spectrum obtained from the MTSPR sensor chip showed a strong and narrow surface plasmon resonance (SPR) peak located between 650 and 800 nm. The maximum SPR excitation was observed at an incident angle of 35 degrees. The MTSPR sensor chip was employed for glucose sensor application. Gold-coated grating substrates were functionalized using 3-mercapto-1-propanesulfonic acid sodium salt and subsequently functionalized using a five-bilayer poly(allylamine hydrochloride)/ poly(sodium 4-styrenesulfonate) to facilitate the coupling/ decoupling of the surface plasmon and to prepare a uniform surface for sensing. The detection limit of our developed system for glucose was 2.31 mM. This practical platform represents a high possibility of further developing several biomolecules, multiplex systems, and a point-of-care assay for practical biosensor applications. (C) 2017 The Japan Society of Applied Physics

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  • Transmission light property due to grating-coupled long-range surface plasmon resonance 査読

    Kazunari Shinbo, Kodai Takizawa, Naoki Obata, Chutiparn Lertvachirapaiboon, Akira Baba, Keizo Kato, Futao Kaneko

    POLYMER BULLETIN   73 ( 9 )   2539 - 2546   2016年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Transmission light property due to surface plasmon resonance (SPR) was investigated for glass substrate/500-nm-thick fluoropolymer (CYTOP) with a grating structure/thin metal film/mixed solution of water and glycerol system. Transmission light peaks were observed due to grating-coupled SPR, with a remarkable peak intensity when pure water exists as an ambient dielectric. CYTOP exhibits a refractive index close to that of water, and the remarkable peak intensity was attributed to long-range SPR. The monitoring of polyelectrolyte layer-by-layer film deposition using transmission light was also investigated.

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  • Effect of urchin-like gold nanoparticles in organic thin-film solar cells 査読

    Apichat Pangdam, Supeera Nootchanat, Ryousuke Ishikawa, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Chuchaat Thammacharoen, Sanong Ekgasit, Akira Baba

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   18 ( 27 )   18500 - 18506   2016年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    In this study, urchin-like gold nanoparticles (UL-AuNPs) are used in the fabrication of organic thin-film solar cells (OSCs). UL-AuNPs, which have gold nanothorns on their surface, enhance light accumulation by acting as light-trapping materials. This is due to the enhanced electric field and light scattering attributed to the nanothorns on the surface of the nanoparticles. UL-AuNPs were incorporated into a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) thin-film layer of organic thin-film solar cells (OSCs). UV-vis spectra, atomic force microscopy (AFM) images, current density versus voltage properties, and the impedance spectra of the fabricated devices were recorded at various concentrations of UL-AuNPs. We found that the efficiency of the OSCs with UL-AuNPs was not only higher than that of a reference cell without nanoparticles but also higher than that of OSCs with spherical AuNPs. Finite-difference time-domain (FDTD) simulation indicated that the electric field around the UL-AuNPs increased due to the presence of nanothorns.

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  • Generation of fluorescent nanodroplets of liquid crystal utilizing electrospray deposition 査読

    Yasuo Ohdaira, Hisaki Oka, Kazunari Shinbo, Akira Baba, Keizo Kato, Futao Kaneko

    Japanese Journal of Applied Physics   55 ( 2 )   02BB09   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society of Applied Physics  

    Fluorescent nanodroplets of liquid crystal (LC) were generated by the electrospray deposition of LC solvent containing rhodamine 6G (Rh6G) dye molecules. The shape and density of the nanodroplets strongly depended on the concentration of LC diluted with ethanol solution. The fluorescent spectra from the Rh6G molecules in LC nanodroplets were obviously blue-shifted compared with the LC films of the bulk state. Furthermore, the LC nanodroplets were dispersed on a metallic nanograting formed by optically modifying an azobenzene thin-film layer under the metallic film. The nanodroplets were size-selectively aligned on the metallic nanograting.

    DOI: 10.7567/JJAP.55.02BB09

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  • Generation of fluorescent nanodroplets of liquid crystal utilizing electrospray deposition 査読

    Yasuo Ohdaira, Hisaki Oka, Kazunari Shinbo, Akira Baba, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 2 )   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Fluorescent nanodroplets of liquid crystal (LC) were generated by the electrospray deposition of LC solvent containing rhodamine 6G (Rh6G) dye molecules. The shape and density of the nanodroplets strongly depended on the concentration of LC diluted with ethanol solution. The fluorescent spectra from the Rh6G molecules in LC nanodroplets were obviously blue-shifted compared with the LC films of the bulk state. Furthermore, the LC nanodroplets were dispersed on a metallic nanograting formed by optically modifying an azobenzene thin-film layer under the metallic film. The nanodroplets were size-selectively aligned on the metallic nanograting. (C) 2016 The Japan Society of Applied Physics

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  • Improvement of on/off ratio in organic field-effect transistor with carrier generation layer using oblique deposition 査読

    Hidetsugu Tamura, Masahiro Minagawa, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 2 )   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Improvement of the on/off ratio in carrier-generation type organic field-effect transistors with pentacene and MoO3 layers was attempted using oblique deposition. A MoO3 layer was formed only between the gold (Au) source and the drain electrodes, and devices with a MoO3 layer evaporated under various deposition angles were fabricated. A formation of a MoO3-free area is expected adjacent to the source or drain electrode by the oblique deposition. The off-current in the device decreased and the on/off ratio was increased with increasing deposition angle, and we achieved a fabricating device with a MoO3 layer having high on/off ratio, almost the same as that of the device without the MoO3 layer. From those results, we deduced that charge-transfer (CT) complexes at the pentacene/MoO3 interface formed a high-conductive path for the off-current, and the off-current was reduced by the formation of a highly-resistive MoO3-free area between electrodes. Therefore, controlling the CT complex layer formation by patterning the MoO3 layer can reduce the amount of off-current and improve the on/off ratio. (C) 2016 The Japan Society of Applied Physics

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  • Improving the efficiency of organic solar cells by grating-coupled SPR 査読

    Supeera Nootchanat, Apichat Pangdam, Ryousuke Ishikawa, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nozomu Tsuboi, Sanong Ekgasit, Akira Baba

    EFM 2016   2016年1月

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    掲載種別:研究論文(国際会議プロシーディングス)  

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  • Application of Long-Range Surface Plasmon Resonance for ABO Blood Typing 査読

    Wanida Tangkawsakul, Toemsak Srikhirin, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Akira Baba

    INTERNATIONAL JOURNAL OF ANALYTICAL CHEMISTRY   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORP  

    In this study, we demonstrate a long-range surface plasmon resonance (LR-SPR) biosensor for the detection of whole cell by captured antigens A and B on the surface of red blood cells (RBCs) as a model. The LR-SPR sensor chip consists of high-refractive index glass, a Cytop film layer, and a thin gold (Au) film, which makes the evanescent field intensity and the penetration depth longer than conventional SPR. Therefore, the LR-SPR biosensor has improved capability for detecting large analytes, such as RBCs. The antibodies specific to blood group A and group B (Anti-A and Anti-B) are covalently immobilized on a grafting self-assembled monolayer (SAM)/Au surface on the biosensor. For blood typing, RBC samples can be detected by the LR-SPR biosensor through a change in the refractive index. We determined that the results of blood typing using the LR-SPR biosensor are consistent with the results obtained fromthe agglutination test. We obtained the lowest detection limits of 1.58 x 10(5) cells/ml for RBC-A and 3.83 x 10(5) cells/ml for RBC-B, indicating that the LR-SPR chip has a higher sensitivity than conventional SPR biosensors (3.3 x 10(8) cells/ml). The surface of the biosensor can be efficiently regenerated using 20mM NaOH. In summary, as the LR-SPR technique is sensitive and has a simple experimental setup, it can easily be applied for ABO blood group typing.

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  • ナノインプリント法によるグレーティング構造を有する逆型有機薄膜太陽電池の作製と評価 査読

    原 一馬, Lertvachirapaiboon Chutiparn, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電気学会論文誌A(基礎・材料・共通部門誌)   136 ( 11 )   690 - 696   2016年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    <p>In this work, inverted organic thin film solar cells on grating-structured electrode were fabricated by a nanoimprinting technique. First, a TiO<sub>2</sub> layer was deposited on an ITO/glass slide substrate. Then, the blend of poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) with mass ratio of 1:0.8 dissolved in 1,2-dichlorobenzene was spin-coated on the TiO<sub>2</sub> layer. The grating pattern was created on the P3HT:PCBM layer by nanoimprinting technique using PDMS stamp. PDMS grating pattern template was created also by nanoimprinting using DVD-R grating template with the grating pitch of 740 nm. Poly(3,4ethylenedioxythiophene):poly(styrene sulfonate) (PEDOS:PSS) was then spin-coated on the patterned PHT:PCBM layer. Finally, Au was deposited on the PEDOT:PSS as a top electrode by vacuum evaporation technique. The fabricated device showed higher short-circuit photo-current as compared to standard flat solar cells. Transmitted-surface plasmon resonance (T-SPR) measurements showed that the surface plasmon excitation is one of the factors for an enhancement of the device performance. Furthermore, polarized UV-vis. absorption measurements exhibited that the P3HT molecules aligned in vertical direction (in-plane) to the grating groove direction after the nanoimprinting.</p>

    DOI: 10.1541/ieejfms.136.690

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  • Vapor Sorption to Polyvinyl Alcohol Thin Film Observed Using a Hybrid Sensor of Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance 査読

    Kazunari Shinbo, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   622 ( 1 )   67 - 73   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

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  • Surface Hardening and Nitride Precipitation in the Nitriding of Fe-M1-M2 Ternary Alloys Containing Al, V, or Cr 査読

    Goro Miyamoto, Shotaro Suetsugu, Kunio Shinbo, Tadashi Furuhara

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   46A ( 11 )   5011 - 5020   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    Nitride precipitation and resultant surface hardening in nitrided Fe-M1-M2 ternary alloys containing Cr, Al, or V were investigated using transmission electron microscopy and three-dimensional atom probe tomography. The (Al, Cr) and (Cr, V) mixed nitrides are formed by the co-precipitation of these elements during the nitriding of Fe-Al-Cr or Fe-Cr-V alloys. However, the precipitation of V nitrides precedes Al nitride precipitation during the nitriding of the Fe-Al-V alloy, which results in two-step hardening behavior. The addition of Cr or V to the Fe-Al alloy accelerates the precipitation kinetics of Al nitrides by promoting the nucleation of Al nitrides, which leads to substantial surface hardening. (C) The Minerals, Metals & Materials Society and ASM International 2015

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  • In Situ Study of Electropolymerized Poly(3-aminobenzoic acid) Thin Film on BD-R and DVD-R Grating Substrates by Electrochemical-Transmission Surface Plasmon Resonance Spectroscopy 査読

    Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    INTERNATIONAL JOURNAL OF POLYMER SCIENCE   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORPORATION  

    The electropolymerization process and doping/dedoping properties of poly(3-aminobenzoic acid) (PABA) thin films on gold-coated commercial BD-R and DVD-R grating substrates were simultaneously studied by the combination of electrochemical technique and transmission surface plasmon resonance (TSPR) spectroscopy. The optical property as a function of the applied potentials and time dependence during electropolymerization were studied. The obtained TSPR wavelength scan spectra after electropolymerization showed that the maximum wavelength slightly shifted to longer wavelength indicating the increase of film thickness. In addition, the change during construction of PABA-based immunosensor for label-free detection of human immunoglobulin G can be observed.

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  • 静電容量の実時間測定によるリチウムイオン電池の劣化評価 査読

    金子 双男, 川上 貴浩, 新保 一成, 馬場 暁, 加藤 景三, 宮嵜 重利, 清水 浩一, 佐藤 健一, 花岡 治

    電気学会論文誌A(基礎・材料・共通部門誌)   135 ( 10 )   624 - 629   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    A novel method was proposed to judge degradation/health of lithium-ion batteries using the capacitance that was estimated from the real-time voltage and current characteristics of the batteries. It is thought that the capacitance of lithium ion batteries decreases with degradation because of undesirable components formed on the electrodes that are the main cause of the degradation. As the lithium ion batteries are active, the capacitance was evaluated from the differential equation, ΔQ/Δv = I/(Δv/Δt) = i/(dv/dt), using the voltage and the current characteristics during the charging or the discharging. The capacitances of the commercial LIBs with different SOHs; 100, 92 and 88% were estimated during the charging and the discharging using the equation. The average capacitance in the specific voltage region of the batteries was directly proportional to the state of health. Therefore, the proposed measurement is thought to be a useful method for judging degradation of lithium-ion batteries.

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  • Enhanced Photocurrent Generation at a Spiro-OMeTAD/AuNPs-TiO2 Interface with Grating-coupled Surface Plasmon Excitation. 査読

    Hathaithip Ninsonti, Kazuma Hara, Supeera Nootchanat, Weerasak Chomkitichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE Trans. Electron.   98-C ( 2 )   104 - 109   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    The fabrication of a grating structure formed by a solid-state electrolyte layer on a dye-TiO2 film by the nanoimprinting technique using a polydimethylsiloxane (PDMS) stamp and its application in photoelectric conversion devices are described. The PDMS grating pattern is imprinted from blu-ray disc recordable. A silver electrode was deposited on the patterned solid-state electrolyte layers. Surface plasmon resonance (SPR) excitation was observed in the fabricated solar cells by irradiation with white light. The photoelectric conversion properties were measured to study the effect of the two types of SPR excitations, i.e., the propagating surface plasmon on the Ag grating surface and the localized surface plasmon from the Au nanoparticles on TiO2.

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  • Improvement of On/Off Ratio in Organic Field-effect Transistor Having Thin Molybdenum Trioxide Layer. 査読

    Masahiro Minagawa, Hidetsugu Tamura, Ryo Sakikawa, Itsuki Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE Trans. Electron.   98-C ( 2 )   98 - 103   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    We fabricated organic field-effect transistors (OFETs) having a thin layer of molybdenum trioxide (MoO3), a Lewis acid, and evaluated their electrical characteristics. The insertion of a thin MoO3 layer reduces the on/off ratio but improves the apparent mobility of the charge carriers. To identify the dominant mechanism responsible for this effect, we characterized devices having a 69-nm-thick pentacene layer with a 1-nm-thick MoO3 layer either between the gold source and the drain electrodes or only directly under these electrodes. The former device exhibited a low on/off ratio, whereas the latter device exhibited an on/off ratio comparable to those of conventional pentacene OFETs without a thin MoO3 layer, suggesting that the formation of charge-transfer (CT) complexes immediately above the conduction channel is the critical mechanism. CT complexes at the pentacene/MoO3 interface immediately above the conduction channel contribute to the formation of an effective channel for off-currents as well as drain currents. Moreover, we also attempted to improve the on/off ratio by using a cloth to rub the surface of a thin MoO3 layer immediately above the conduction channel to create what we believe to be a profile with abrupt changes in height in the direction of the drain current conduction in OFETs. Consequently, it was found that such a rubbed MoO3 layer had a surface with a scratched pattern, and the on/off ratio of the OFET was improved, indicating that controlling the CT complex formation by patterning a MoO3 layer can reduce the off-current in OFETs having a pentacene/MoO3 active layer.

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  • Evaluation of a PAH/PSS Layer-by-Layer Deposited Film Using a Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance Hybrid Sensor. 査読

    Keisuke Kawachi, Kazunari Shinbo, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    IEICE Trans. Electron.   98-C ( 2 )   136 - 138   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    A quartz-crystal-microbalance (QCM) and surface-plasmon-resonance (SPR) hybrid sensor was prepared, and the depositions of polymer electrolytes layer-by-layer (LbL) films were observed in situ. The estimated thicknesses obtained from the QCM method were different from those obtained from the SPR method. This was estimated to be caused by film swelling and water contained in the film.

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  • Long-range surface plasmon resonance immunosensor based on water-stable electrospun poly(acrylic acid) fibers 査読

    Paphawadee Netsuwan, Hiroto Mimiya, Akira Baba, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sukon Phanichphant

    SENSORS AND ACTUATORS B-CHEMICAL   204   770 - 776   2014年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Water-stable poly(acrylic acid) (PAA) fibers were fabricated on flat gold thin films via an electrospinning technique. The obtained fibers were then used to construct long-range surface plasmon resonance (LR-SPR) biosensors. Because LR-SPR spectroscopy has a greater evanescent field intensity and penetration depth than conventional surface plasmon resonance (SPR) spectroscopy, the increased surface area of the PAA fibers within the surface plasmon evanescent field was efficiently utilized for biosensor applications. The water-stable electrospun PAA fibers were obtained by adding beta-cyclodextrin as a crosslinker, followed by thermal treatment at 150 degrees C for 40 min. In addition, the layer-by-layer deposition of poly(diallyldimethylammonium chloride) and PAA ultrathin films on the electrospun PAA fibers functionalized their surfaces and further increased their water-stability by increasing the number of active carboxylic acid groups. Fiber surfaces were then successfully activated for the construction of immunosensors for the detection of human immunoglobulin G. Therefore, the present study demonstrates the potential of electrospun fibers for LR-SPR biosensor applications. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.snb.2014.07.121

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  • Multiple plasmonic effect on photocurrent generation of metal-loaded titanium dioxide composite/dye films on gold grating surface 査読

    Weerasak Chomkitichai, Hathaithip Ninsonti, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    SURFACE AND INTERFACE ANALYSIS   46 ( 9 )   607 - 612   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    We demonstrate the multiple plasmonic effect on the photocurrent properties of photoanodes containing Ag or Au nanoparticles (NPs) loaded onto titanium dioxide film (Ag-TiO2 or Au-TiO2) on Au grating surfaces. Ag-TiO2 or Au-TiO2 nanocomposite particles are prepared by a flame spray pyrolysis route. The structures and morphologies of the prepared products are characterized by high-resolution transmission electron microscopy. The Ag-TiO2 or Au-TiO2 composite NPs are deposited by spin coating onto the Au grating surfaces. The photoanode electrode is a layered structure of blu-ray disc-recordable grating substrate/Au/Ag (or Au)-TiO2/dye/electrolyte/indium-tin oxide. The plasmonic effect is induced when Ag or Au NPs are located within the propagating surface plasmon (SP) field on the Au grating surface. The short-circuit photocurrent is increased by exciting the grating-coupled propagating SP on the Au gratings and is further enhanced by positioning the Ag or Au NPs within the grating-coupled SP field. Copyright (C) 2014 John Wiley & Sons, Ltd.

    DOI: 10.1002/sia.5577

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  • Distance-Dependent Surface Plasmon Resonance Coupling Between a Gold Grating Surface and Silver Nanoparticles 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PLASMONICS   9 ( 4 )   899 - 905   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    In this study, we achieved an enhancement of the transmission surface plasmon resonance (T-SPR) intensity by depositing silver nanoparticles (AgNPs) onto a gold grating substrate. The T-SPR spectrum of the gold grating substrate with AgNPs showed a strong and narrow SPR peak located between 650 and 800 nm; the maximum SPR excitation was observed at a 35A degrees angle of incidence. We controlled the distance between the gold grating surface and the AgNPs by using layer-by-layer (LbL) ultrathin films of poly(diallydimethylammonium chloride) (PDADMAC) and poly(sodium 4-styrenesulfonate) (PSS) to study the distance dependence of the coupling effect between the AgNPs and the gold grating substrate. The distance-dependent T-SPR response of peak position and intensity showed distinctive changes when the intermediate layer was 10 bilayers (similar to 17 nm) thick. The strongest coupling surface plasmon excitation between the AgNPs and the gold grating substrate was obtained at this layer spacing. Furthermore, we explored the potential of the developed system as a switchable pH sensor. The T-SPR spectrum sensitively changed as the pH switched from acidic (pH 2) to alkaline (pH 12) conditions by the swelling/shrinking of the poly(allylamine hydrochloride) (PAH)/PSS LbL film, respectively, which was deposited between the AgNPs and the gold grating.

    DOI: 10.1007/s11468-014-9695-2

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  • CS-1-4 表面プラズモン励起による有機デバイス・センサの高性能化(CS-1.高性能有機デバイス開発に向けた有機エレクトロニクスの新展開,シンポジウムセッション) 招待 査読

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会総合大会講演論文集   2014 ( 2 )   "S - 6"-"S-7"   2014年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • Investigation of localized surface plasmon/grating-coupled surface plasmon enhanced photocurrent in TiO2 thin films 査読

    Supeera Nootchanat, Hathaithip Ninsonti, Akira Baba, Sanong Ekgasit, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   16 ( 44 )   24484 - 24492   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    We fabricated plasmonic gold nanoparticle (AuNP)-TiO2 nanocomposite films and measured the photocurrent that originates from the water-splitting reaction catalyzed by the AuNP-TiO2 nanocomposite photo-electrocatalytic (PEC) electrode. The localized surface plasmon resonance (LSPR) of the gold nanoparticles affected the generation of photocurrent by TiO2 upon illumination with visible light. Electrochemical impedance spectroscopy (EIS) revealed that the improvement in the photocurrent generation originates from an enhancement in electron-hole pair generation induced by the SPR of the plasmonic gold nanoparticles rather than the extension of the electron lifetime. Moreover, we introduced a novel method to enhance the photocurrent of TiO2 by a multiple plasmonic effect, i.e., LSPR of plasmonic gold nanoparticles and the grating-coupled propagating SP on a gold grating. We fabricated the AuNP-TiO2 nanocomposites on a gold-coated Blu-ray disc recordable (BD-R). The enhancement of the photocurrent due to the combination of LSPR and the grating-coupled SP was investigated.

    DOI: 10.1039/c4cp03885a

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  • Simultaneous Detection of Ammonia and Water Vapors Using Surface Plasmon Resonance Waveguide Sensor 査読

    Ryo Komai, Hiroki Honda, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PROCEEDINGS OF 2014 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM 2014)   284 - 286   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    A waveguide-based SPR sensor for double analyte detections was prepared with a single waveguide, and sensing for ammonia and water vapors were carried out. A BK-7 slide glass was used as a waveguide core, and two pairs of Ag films (50 nm) / sensing polymer films with different thicknesses were prepared separately on the waveguide. White light was input from the substrate edge, and the output light spectrum was observed. SPR dips can be separately observed in the output light spectra by selecting the thickness of the polymer film, which govern the SPR condition. Poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) were used as sensing material. PAA responded to both of water and ammonia vapors, and PVA mainly responded to water vapor. Simultaneous measurement would enable precise ammonia measurement under various humidities.

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  • Au-Loaded Titanium Dioxide Nanoparticles Synthesized by Modified Sol-Gel/Impregnation Methods and Their Application to Dye-Sensitized Solar Cells 査読

    Hathaithip Ninsonti, Weerasak Chomkitichai, Akira Baba, Natda Wetchakun, Wiyong Kangwansupamonkon, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    INTERNATIONAL JOURNAL OF PHOTOENERGY   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:HINDAWI PUBLISHING CORPORATION  

    Au-loaded TiO2 nanoparticles were synthesized by the modified sol-gel method together with the impregnation method. Anatase phase of TiO2 was obtained in all samples with an average particle size of 20 nm. For the enhancement of DSSCs, the dye-sensitized solar cells composed of the ITO/Au-loaded TiO2/N-719/electrolyte/Pt were fabricated. Au-loaded TiO2 films were deposited by using squeegee method. Finally, the fabricated cells were studied upon an irradiation of solar light to study the performance. The fabricated cell with up to 1.0 mol% Au-loaded TiO2 could enhance the performance by localized surface plasmon effect and scattering property.

    DOI: 10.1155/2014/865423

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  • Enhanced Photocurrent Properties of Solid-State Dye-Sensitized Solar Cells by Grating Coupled-Surface Plasmon Resomamce 査読

    Kazuma Hara, Ninsonti Hathaithip, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PROCEEDINGS OF 2014 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS (ISEIM 2014)   526 - 528   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this work, we report the fabrication of grating structure of solid-state electrolyte layers on dye-TiO2 film by nanoimprint technique using PDMS stamp, and their application to photo-electric conversion devices. PDMS grating pattern is imprinted from BD-R or nickel templates. Silver electrode was deposited on the patterned solid-state electrolyte layers. Surface plasmon resonance excitation is observed on the fabricated solar cells by an irradiation of white light. The photo-electric conversion properties are measured to study the effect of two types of surface plasmon resonance excitations, i.e. propagating surface plasmon on Ag grating surface and localized surface plasmon from the Au nanoparticles on TiO2.

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  • A novel method for judging health/degradation of lithium-ion batteries 査読

    Futao Kaneko, Takahiro Kawakami, Akira Baba, Kazunari Shinbo, Keizo Kato, Shigetoshi Miyazaki, Koichi Shimizu, Kenichi Sato, Osamu Hanaoka

    Materials Research Society Symposium Proceedings   1681   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Materials Research Society  

    A novel and fundamental method was reported to judge states of lithium ion batteries (LIBs) using the capacitance and the voltage of the cells that were estimated from the real-time currents and voltage characteristics of the cells. We measured the differential capacitance, that is, dQ/dV or delta Q/ delta V that is equal to the currents (I) divided by differential voltages (dV/dt) calculated from the current and the voltage characteristics of the cell during the charging/ discharging, where Q is the charge that flows through the cell, V is the voltage of the cell and t is time. It is thought that the capacitance decrease with the degradation of the cell because the effective area of the electrodes is decreasing due to formation of undesirable compounds. The differential capacitance in some specific voltage range for the LIBs was approximately directly proportional to the state of the degradation of the cell. Therefore, it is concluded that the novel method is very useful to judge the state of the LIBs.

    DOI: 10.1557/opl.2014.671

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  • Electrochemically controlled detection of adrenaline on poly(2-aminobenzylamine) thin films by surface plasmon resonance spectroscopy and quartz crystal microbalance 査読

    Sopis Chuekachang, Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    SURFACE AND INTERFACE ANALYSIS   45 ( 11-12 )   1661 - 1666   2013年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    In this study, we present an electrochemically controlled surface plasmon resonance (EC-SPR) biosensor to detect adrenaline on poly(2-aminobenzylamine) (P2ABA) thin films. The P2ABA thin films are stable and display electroactivity in a neutral PBS solution. Specific detection of adrenaline was performed on P2ABA thin films because the benzylamine groups in the P2ABA structure could specifically react with adrenalines. Adrenaline was detected in real time by EC-SPR spectroscopy, which provides an EC-SPR reflectivity change on the P2ABA thin film upon adrenaline injection. The measured responses were quite different from those for uric acid and ascorbic acid, which are major interferences in adrenaline detection. The electrochemically applied potential facilitates the specific detection of adrenaline. In addition, the detection of adrenaline on the P2ABA thin films was investigated by a quartz crystal microbalance technique. The detection limit for adrenaline at open circuit potential was 10 pM. The present study provides a useful information on the detection of adrenaline on the P2ABA thin films. Copyright (c) 2013 John Wiley & Sons, Ltd.

    DOI: 10.1002/sia.5301

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  • Fabrication of thin film from conducting polymer/single wall carbon nanotube composites for the detection of uric acid 査読

    Sopis Chuekachang, Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    Molecular Crystals and Liquid Crystals   580 ( 1 )   1 - 6   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Poly(2-aminobenzylamine)/single wall carbon nanotube (P2ABA/SWNTS) thin films were fabricated for the detection of UA by using electrochemical surface plasmon resonance spectroscopy (EC-SPR) technique. The suspension of 0.01% wt of carboxylated SWNTSs was assembled on the polymer film because of the electrostatic and van der Waals interactions between the COOH and NH 2. The P2ABA/SWNTS thin film formation on gold electrode was studied by EC-SPR technique. In this work, uric acid was detected by EC-SPR in PBS buffer comparing with the interference response with ascorbic acid. EC-SPR uric acid sensor using P2ABA/SWNTS thin film can be applied for the detection of uric acid in urine. © 2013 Taylor and Francis, LLC.

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  • Fabrication of Carboxylated Conducting Polymer/CNTs Composites Thin Films for Immunosensor Application 査読

    P. Netsuwan, S. Sriwichai, S. Phanichphant, A. Baba, K. Shinbo, K. Kato, F. Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   580 ( 1 )   7 - 14   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Electropolymerization of carboxylated conducting polymer/carbon nanotubes (CNTs) composites thin films has been studied by in situ electrochemical-surface plasmon resonance (EC-SPR) spectroscopy. Two derivatives of benzothiophene, thianaphthene-2-carboxylic acid and benzothiophene-2-propionic acid, composited with CNTs were electropolymerized in an acetonitrile with the potential range between 0 and 1.2V at scan rate of 20mV/s. The obtained films were characterized by in situ EC-SPR spectroscopy, UV-vis absorption spectroscopy, and atomic force microscopy. It was found that CNTs can improve properties of polymer/CNT composites films. Moreover, the obtained thianaphthene-2-carboxylic acid film can be further used for construction of immunosensor for detection of human IgG.

    DOI: 10.1080/15421406.2013.803890

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  • Electrochemically Fabricated Pyrrole Copolymer Thin Films and Their Electroactivity in Neutral Aqueous Solution 査読

    Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   580 ( 1 )   29 - 34   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The functionalized pyrrole copolymers were fabricated by electropolymerization of pyrrole (Py) and functionalized pyrrole monomers, pyrrole-3-carboxylic acid (P3C) and 4-(3-pyrrole) butyric acid (PBA). The electrochemical behavior and doping/dedoping properties of the obtained copolymer thin films were investigated by cyclic voltammetry (CV) in neutral phosphate-buffered saline (PBS) solution. Moreover, the functionalized pyrrole copolymer films were characterized by UV-vis absorption spectroscopy and atomic force microscopy (AFM). The obtained copolymer thin films showed good stability and electroactivity in neutral PBS solution. The presented functionalized pyrrole copolymer thin films may possess potential applications to study in various systems of the biosensors.

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  • Effects of alpha/gamma orientation relationship on VC interphase precipitation in low-carbon steels 査読

    Y. -J. Zhang, G. Miyamoto, K. Shinbo, T. Furuhara

    SCRIPTA MATERIALIA   69 ( 1 )   17 - 20   2013年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The effects of the ferrite/austenite orientation relationship (OR) on interphase precipitation in Fe-0.1C-1.5Mn-0.4V (mass%) alloy were investigated by using electron backscattering diffraction and three-dimensional atom probe. VC interphase precipitation in both sheet-like and random dispersions is obtained in ferrite without a near Kurdjumov-Sachs (K-S) OR with adjacent austenite into which the ferrite grows, while the number density of VC in ferrite with a K-S OR is far lower, indicating that a large deviation from the K-S OR is necessary for interphase precipitation in low-carbon steels. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2013.03.020

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  • Transmission Surface Plasmon Resonance Signal Enhancement via Growth of Gold Nanoparticles on a Gold Grating Surface 査読

    Chutiparn Lertvachirapaiboon, Chirayut Supunyabut, Akira Baba, Sanong Ekgasit, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PLASMONICS   8 ( 2 )   369 - 375   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    We developed a novel technique for increasing the sensitivity of transmission surface plasmon resonance (T-SPR) signals. T-SPR spectroscopy was performed by irradiating, with white light, a gold grating substrate whose surface was nanostructured by growing gold nanoparticles (AuNPs). AuNPs were grown directly on the substrate surface by alcohol reduction and their growth was observed at various stages by UV-visible spectroscopy and standard Kretschmann-type SPR spectroscopy. For comparison, normal gold film with smooth surface was examined under similar condition. The T-SPR results show a possibility of hybrid excitation of both localized and propagating surface plasmon. Significantly, T-SPR spectra of the gold grating substrate obtained during AuNP growth show stronger and narrower peaks in the range 650-800 nm. The maximum T-SPR excitation was at an incident angle of 35 degrees. A layer-by-layer system of 5,10,15,20-tetrakis (1-methyl-4-pyridinio) porphyrin tetra(p-toluenesulfonate) molecules and sodium copper chlorophyllin molecules was used to verify the enhancement of the developed system. We believe that the AuNPs/Au grating for T-SPR devices will provide enhanced signals for detecting nanometer order materials and for high-sensitive sensor applications.

    DOI: 10.1007/s11468-012-9400-2

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  • Fabrication of a Quartz-Crystal-Microbalance/Optical-Waveguide Hybrid Sensor and In situ Evaluation of Vacuum-Evaporated Lead Phthalocyanine Thin Film 査読

    Kazunari Shinbo, Akihiro Uno, Ryo Hirakawa, Akira Baba, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 5 )   05DC20-1 - 05DC20-5   2013年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    In this study, we fabricated a novel quartz-crystal-microbalance (QCM)/optical-waveguide hybrid sensor. An in situ observation of a lead phthalocyanine (PbPc) thin-film deposition was conducted during vacuum evaporation, and the effectiveness of the sensor was demonstrated. The film thickness was obtained from the QCM frequency, and the optical absorption of the film was observed by optical waveguide spectroscopy using part of the QCM substrate without the electrode. The film absorption depends on the polarization direction, substrate temperature and deposition rate, owing to aggregate formation. The thickness dependence of the absorption property was also investigated. (C) 2013 The Japan Society of Applied Physics

    DOI: 10.7567/JJAP.52.05DC20

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  • Quantitative measurement of carbon content in Fe-C binary alloys by atom probe tomography (vol 67, pg 999, 2012) 査読

    Goro Miyamoto, Kunio Shinbo, Tadashi Furuhara

    SCRIPTA MATERIALIA   68 ( 8 )   658 - 658   2013年4月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

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  • Enhanced Photocurrent Properties of Dye/Au-Loaded TiO2 Films by Grating-Coupled Surface Plasmon Excitation 査読

    Hathaithip Ninsonti, Weerasak Chomkitichai, Akira Baba, Wiyong Kangwansupamonkon, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E96C ( 3 )   385 - 388   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    We report enhanced photocurrent properties of dye/Au-loaded titanium dioxide (TiO2) films on Au gratings. Au-loaded TiO2 nanopowders were first synthesized by a modified sol-gel method and then prepared by the impregnation method. We also fabricated dye-sensitized solar cells, which were composed of Au grating/Au-TiO2/TMPyP-SCC LbL (20 bilayers)/electrolyte/ITO substrates. Short-circuit photo-current measurements showed that Au-loaded TiO2 with grating-coupled surface plasmon excitation can enhance the short-circuit photocurrentof the fabricated cells.

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  • Enhanced Photocurrent Properties of Dye/Au-Loaded TiO2 Films by Grating-Coupled Surface Plasmon Excitation 査読

    Hathaithip Ninsonti, Weerasak Chomkitichai, Akira Baba, Wiyong Kangwansupamonkon, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E96C ( 3 )   385 - 388   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    We report enhanced photocurrent properties of dye/Au-loaded titanium dioxide (TiO2) films on Au gratings. Au-loaded TiO2 nanopowders were first synthesized by a modified sol-gel method and then prepared by the impregnation method. We also fabricated dye-sensitized solar cells, which were composed of Au grating/Au-TiO2/TMPyP-SCC LbL (20 bilayers)/electrolyte/ITO substrates. Short-circuit photo-current measurements showed that Au-loaded TiO2 with grating-coupled surface plasmon excitation can enhance the short-circuit photocurrentof the fabricated cells.

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  • Quantitative measurement of carbon content in Fe-C binary alloys by atom probe tomography 査読

    Goro Miyamoto, Kunio Shinbo, Tadashi Furuhara

    SCRIPTA MATERIALIA   67 ( 12 )   999 - 1002   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The carbon content in high-purity Fe-C binary alloys was measured by 3-D atom probe microscopy. The apparent carbon content increased with decreasing measurement temperature and greatly exceeded the nominal value. This anomaly is caused by the loss of some Fe ions during detection, resulting in an overestimation of the carbon content. A simple method was proposed to correct for this effect. The corrected carbon content agreed well with the nominal value to within 0.5 at.% in most cases. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2012.09.007

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  • Mechanism behind Improved Apparent Field-Effect Mobility in Pentacene Thin-Film Transistors with Thin Molybdenum Trioxide Layer 査読

    Masahiro Minagawa, Yasuo Sato, Akira Takahashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   51 ( 10 )   101601-1 - 101601-5   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Insertion of a thin layer of the Lewis acid molybdenum trioxide (MoO3) improves the apparent mobility of charge carriers in organic field-effect transistors (OFETs). In order to identify the dominant mechanism responsible for this, we characterized devices having a bottom pentacene (70 - z nm)/MoO3 (1 nm)/top pentacene (z nm) structure and those having pentacene (69 nm)/MoO3 (1 nm) only under the gold source and drain electrodes. The former devices exhibited large drain currents (I-DS)and mobilities, regardless of the z value. Moreover, the latter devices exhibited comparable I-DS and mobilities to those of conventional pentacene OFETs, suggesting that the formation of CT complexes just above the conduction channel is the critical mechanism. Carriers generated by dissociation of CT complexes at the pentacene/MoO3 interface contribute to the formation of an effective channel and the apparent mobility. (C) 2012 The Japan Society of Applied Physics

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  • Controlling Surface Plasmon Optical Transmission with an Electrochemical Switch Using Conducting Polymer Thin Films 査読

    Akira Baba, Kohji Tada, Rapiphun Janmanee, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sukon Phanichphant

    ADVANCED FUNCTIONAL MATERIALS   22 ( 20 )   4383 - 4388   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

    Surface plasmon resonance (SPR)-enhanced optical transmission is actively controlled by an electrochromism of conducting polymer thin films. Polyaniline and poly(3,4-ethylenedioxythiophene) thin films are deposited on a thin gold grating surface. SPR-enhanced optical transmission is demonstrated by irradiating white light on the conducting polymer thin filmgold grating surface and detecting the transmitted light from the back side. The transmission SPR system is combined with an electrochemical setup to manipulate the resonance. The wavelength of the sharp peak in the transmission light spectra is tuned by electrochemical doping/dedoping of the conducting polymer thin films. The present study of controllable SPR-enhanced optical transmission should provide novel active plasmonic devices such as active bandpass filters or biosensors.

    DOI: 10.1002/adfm.201200373

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  • Solution-based fabrication of gold grating film for use as a surface plasmon resonance sensor chip 査読

    Chutiparn Lertvachirapaiboon, Ryosuke Yamazaki, Prompong Pienpinijtham, Akira Baba, Sanong Ekgasit, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    SENSORS AND ACTUATORS B-CHEMICAL   173   316 - 321   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Imprinted solution-processible gold nanoparticle (AuNP) grating films were fabricated for use as a grating-coupled surface plasmon resonance (SPR) excitation substrate. The imprinted AuNP grating pattern, which consists of a 1.72 mu m grating pitch, was fabricated on flat glass substrates by imprinting AuNP on silicon grating templates. In this study, the SPR measurements were carried out on an SPR device in the grating-coupling configuration with a He-Ne laser (lambda = 632.8 nm) as the excitation source, and multimode surface plasmon excitations were observed upon irradiation with white light. SPR excitation of our substrate was observed at the incident angle of 47.1 degrees. For SPR measurements using white light irradiation, multimode surface plasmon excitation resulting from several diffraction orders was observed in the wavelength region of 500-850 nm. The surface plasmon dispersion branches were calculated to obtain the diffraction order in this region. SPR excitation of the imprinted AuNP grating substrate was further studied by fabrication of a layer-by-layer ultrathin film of iron containing bis(terpyridine) polymer (Fe(II)-BTP) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). A shift of the SPR excitation spectrum was observed when the ultrathin film was deposited on the imprinted AuNP grating surface. Thus, this substrate should be a useful SPR substrate in a variety of applications such as photoelectric conversions and sensors. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.snb.2012.07.003

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  • Optical near-field excitation using liquid crystals on nanostructured photoreactive molecular thin films 査読

    Yasuo Ohdaira, Kazunari Shinbo, Akira Baba, Keizo Kato, Futao Kaneko

    SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY   55 ( 8 )   1351 - 1355   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCIENCE PRESS  

    Optical near-field excitations were investigated on the basis of molecular alignment control of liquid crystals (LCs) on an optically rewritable nanostructure of photoreactive molecular thin films. Twisted nematic (TN) cells of LC molecules were constructed utilizing ITO substrates with 260 nm gratings of an azobenzene molecular thin film, fabricated using standing evanescent waves. The polarization changes of light transmitted through the TN cells, which were due to the alignment changes of LC molecules locally rubbed by the azobenzene nanogratings, were observed. Furthermore, we demonstrated local plasmon excitation of Au nanowires deposited on the azobenzene nanogratings using oblique vacuum evaporation, a phenomenon that produced strong anti-optical absorption spectra. The modulation of the local plasmon resonance in metallic nanowires decorated with LC molecules was confirmed.

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  • In situ Electrochemical-Transmission Surface Plasmon Resonance Spectroscopy for Poly(pyrrole-3-carboxylic acid) Thin-Film-Based Biosensor Applications 査読

    Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ACS APPLIED MATERIALS & INTERFACES   4 ( 8 )   4270 - 4275   2012年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    In this study, we describe the combination of transmission surface plasmon resonance (TSPR) an electrochemical techniques for the application to biosensors with conducting polymers. Electropolymerization was employed to construct poly(pyrrole-3-carboxylic acid) (PP3C) film on a gold coated grating substrate using pyrrole-3-carboxylic acid (P3C) monomer solution in 0.5 M H2SO4. In situ electrochemical transmission surface plasmon resonance (EC-TSPR), 1 measurements were carried out to study the kinetic and electroactivity properties of PP3C film. Immobilization of antihuman IgG on the activated surface and the binding process of human IgG and antihuman IgG in neutral solution could be detected in situ by EC-TSPR measurement. The surface modification steps on the PP3C layer led to an increase in intensity of the transmission peak. The performance, sensitivity, and utility of EC-TSPR spectroscopy showed obvious advantages for the detection of binding process with the simple experimental setup, and could be applied to the study of biomolecular interactions in various systems.

    DOI: 10.1021/am300970m

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  • 水晶振動子・光導波路分光複合センサを用いた鉛フタロシアニン薄膜の堆積評価 査読

    平川 諒, 鵜野 成博, 新保 一成, 馬場 暁, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2012 ( 74 )   43 - 46   2012年7月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Fabrication of a Quartz-Crystal-Microbalance/Surface-Plasmon-Resonance Hybrid Sensor and Its Use for Detection of Polymer Thin-Film Deposition and Evaluation of Moisture Sorption Phenomena 査読

    Kazunari Shinbo, Hiroshi Ishikawa, Akira Baba, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    APPLIED PHYSICS EXPRESS   5 ( 3 )   036603-1 - 036603-3   2012年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    We fabricated a hybrid sensor utilizing quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) spectroscopy. We confirmed its effectiveness by observing QCM frequency shifts and SPR wavelength changes for two processes: deposition of various transparent polymer thin films and moisture sorption. For thin-film deposition, the relationship between the QCM frequency and SPR wavelength was found to depend on the refractive index of the film material. For moisture sorption, the direction of SPR wavelength shift depended on the film thickness. This was estimated to be caused by film swelling and decrease in refractive index induced by moisture. (C) 2012 The Japan Society of Applied Physics

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  • Nano-Structured Organic Devises and Biosensors Utilizing Evanescent Waves and Surface Plasmon Resonance 招待 査読

    Futao Kaneko, Akira Baba, Kazunari Shinbo, Keizo Kato

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 12 )   1824 - 1831   2011年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this review, we introduce a variety of surface sensitive techniques for the study of organic thin films, and applications to organic devices. These studies include surface plasmon emission light, organic thin film transistors, combination of quartz crystal microbalance and optical waveguide spectroscopy, evaluation of alignment of liquid crystal molecules at surfaces, and biosensor applications.

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  • Humidity Detection by Using a Hybrid Sensor Employing Optical Waveguide Spectroscopy and Quartz Crystal Microbalance 査読

    Kazunari Shinbo, Makoto Iwasaki, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 12 )   1851 - 1854   2011年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Ridge optical waveguides (OWGs) of fluorinated polyimides were deposited on a quartz crystal microbalance (QCM), and a hybrid sensor employing the OWG spectroscopy and the QCM technique was prepared. A polyvinyl alcohol (PVA) film with CoCl2 was deposited on the OWG, and humidity sensing characteristics were investigated. White light was entered into the waveguide and the output light spectra was observed. The output light intensity markedly changed because of the chromism of CoCl2 by humidity sorption. During the output light measurement, the QCM frequency was monitored simultaneously. The humidity dependences of the QCM frequency and output light were also investigated in a range from 10% to 70%. Furthermore, the response to hydrofluoroether (HFE) was observed, and the change in the output light was hardly observed because CoCl2 does not exhibit chromism in HFE sorption.

    DOI: 10.1587/transele.E94.C.1851

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  • Grating-Coupled Surface Plasmon Enhanced Short-Circuit Current in Organic Thin-Film Photovoltaic Cells 査読

    Akira Baba, Nobutaka Aoki, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ACS APPLIED MATERIALS & INTERFACES   3 ( 6 )   2080 - 2084   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    In this study, we demonstrate the fabrication of grating-coupled surface plasmon resonance (SPR) enhanced organic thin-film photovoltaic cells and their improved photocurrent properties. The cell consists of a grating substrate/silver/P3HT:PCBM/PEDOT:PSS structure. Blu-ray disk recordable substrates are used as the diffraction grating substrates on which silver films are deposited by vacuum evaporation. P3HT:PCBM films are spin-coated on silver/grating substrates. Low conductivity PEDOT:PSS/PDADMAC layer-by-layer ultrathin films deposited on P3HT:PCBM films act as the hole transport layer, whereas high conductivity PEDOT:PSS films deposited by spin-coating act as the anode. SPR excitations are observed in the fabricated cells upon irradiation with white light. Up to a 2-fold increase in the short-circuit photocurrent is observed when the surface plasmon (SP) is excited on the silver gratings as compared to that without SP excitation. The finite-difference time-domain simulation indicates that the electric field in the P3HT: PCBM layer can be increased using the grating-coupled SP technique.

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  • Fabrication of Fluorescence Tunable Electrospun Conjugated Polycarbazole Fibers Containing Gold Nanoparticles 査読

    Akira Baba, Takumi Nakatsukasa, Akihisa Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   11 ( 5 )   4289 - 4294   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SCIENTIFIC PUBLISHERS  

    In this report, we demonstrate a novel way to tune the fluorescence property of electrospun conjugated polymer fibers. The basic strategy is to use a soluble precursor polymer with gold nanoparticies for electrospinning, which is then cross-linked by applying potential cycles in an electrochemical cell. Electroactive carbazole units in electrospun precursor polymer fibers were converted to conjugated polymer fibers. Since the conjugated polymer fibers can be formed, the fluorescence from the conjugated polymer fibers can be tuned by the rate of the conversion and doping of the fibers. Furthermore, the quenching of the fluorescence, which overlaps with the plasmon band of the gold nanoparticles, was observed. The quenching of the fluorescence properties of the fibers was dependent on the amount of gold nanoparticles inside the fibers.

    DOI: 10.1166/jnn.2011.3648

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  • Characteristics of Carrier-generated Field-effect Transistors with Pentacene/Vanadium Pentoxide 査読

    M. Minagawa, K. Nakai, A. Baba, K. Shinbo, K. Kato, F. Kaneko, C. Lee

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   58 ( 5 )   1402 - 1406   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KOREAN PHYSICAL SOC  

    In this paper, the driving mechanism of carrier-generated organic field-effect transistors (OFETs) with pentacene and vanadium pentoxide (V(2)O(5)) layers is discussed. In this study, large on-currents were observed in an OFET with a 35-mm V(2)O(5) layer. Devices with aluminum (Al)/pentacene/V(2)O(5)/Al layer structures were also prepared. These devices exhibited a large current density in spite of their high carrier injection barriers between each layer and the Al electrodes. Moreover, new absorption bands corresponding to the radical cation absorption of pentacene were observed within the absorption spectrum of the pentacene and V(2)O(5) mixed layers. It was inferred that the charge transfer (CT) complexes that formed at the interface between the pentacene and V(2)O(5) layers were dissociated by the applied gate voltage and that the generated holes contributed to driving the OFETs.

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  • Electrochemical-Surface Plasmon Resonance Sensor for the Detection of Catecholamine on Poly(2-aminobenzylamine) Thin Film

    Sopis Chuekachang, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Udom Sriyotha, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    Six International Conference on Molecular Electronics and Bioelectronics   ( D-O-8 )   67   2011年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitation and Emission Light Properties Using Hybrid Setup of Prism and Grating Coupling 査読

    Kazunari Shinbo, Yuta Hirano, Masayuki Sakai, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 2 )   196 - 197   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    A half-cylindrical BK-7 prism/dielectric film with a grating/Ag film/fluorescent polymer film structure was prepared, and its surface plasmon (SP) excitation property was investigated. It was confirmed experimentally that SP excitations are possible in this structure by using prism and grating couplings. The SP excitation property depended on the direction of the grating vector. Furthermore, intense photoluminescence was observed when the SPs were simultaneously excited at the Ag/polymer interface by prism coupling and at the Cytop/Ag interface by grating coupling.

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  • 透過型表面プラズモン共鳴法によるポリピロール誘導体薄膜上ヒトIgGの検出

    馬場 暁, ジャンマニー ラピパン, ファニチファント スーコン, スリウィチャイ サエングラウィ, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   110 ( 409 )   1 - 4   2011年1月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    グレーティングカップリング表面プラズモン共鳴法は、金属で覆われたグレーティング基板上に入射した光の波数にグレーティングベクトルが足し合わさることによりプラズモンの波数と一致して表面プラズモンを共鳴励起する方法であり、プリズムを必要としないことなどから、実用的なセンサーへの応用が検討されてきている。我々はグレーティングカップリング表面プラズモン共鳴法を利用した透過型での簡便な表面プラズモン共鳴センサーへの応用に関する研究を行なってきている。今回、機能性ポリピロール誘導体薄膜を電解重合法により金薄膜グレーティング上に堆積し、その上に抗ヒトIgGを固定化することでヒトIgGの検出を試みたので報告する。

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  • 水晶振動子微量天秤・リッジ型光導波路複合センサを用いた湿度検出

    岩崎 誠, 大平 泰生, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男, 宮寺 信生

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2011 ( 1 )   13 - 16   2011年1月

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  • Detection of Human IgG on Poly(pyrrole-3-carboxylic acid) Thin Film by Electrochemical-Surface Plasmon Resonance Spectroscopy 査読

    Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 1 )   01BK02-1 - 01BK02-6   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    An electrochemically controlled surface plasmon resonance (SPR) immunosensor for the detection of human immunoglobulin G (IgG) has been developed using poly(pyrrole-3-carboxylic acid) (PP3C) film. In this work, a pyrrole-3-carboxylic acid monomer was used for electropolymerization of a PP3C film on a gold-coated high-refractive-index glass slide. In situ electrochemical (EC)-SPR spectroscopy was performed to study the kinetic property and electroactivity property of the PP3C film. Moreover, ultraviolet-visible (UV-vis) spectroscopy was performed to characterize the PP3C film. Finally, the immunosensor-based PP3C film was constructed. The carboxylic acid surface of the PP3C film was activated for the immobilization of anti-human IgG. The immunosensor electrode was used for probing the binding reaction of anti-human IgG/human IgG with several concentrations of human IgG at different constant applied potentials. The probe immobilization and immunosensing process were in situ monitored by EC-SPR technique. The sensitivity of the sensor was improved by controlling the morphology of the PP3C film by applying the potential. (C) 2011 The Japan Society of Applied Physics

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  • Vapor Sensing Using Waveguide-Based Multiple Surface Plasmon Resonance Sensors 査読

    Kazunari Shinbo, Kenta Mizusawa, Hayato Takahashi, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    JAPANESE JOURNAL OF APPLIED PHYSICS   50 ( 1 )   01BC15-1 - 01BC15-5   2011年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Multiple surface plasmon resonance (SPR) sensors were prepared on a waveguide, and vapor sensing was carried out. A BK-7 slide glass was used as a waveguide core, and three pairs of Ag films (50 nm)/polymer films with various thicknesses were prepared separately on the waveguide. White light was input from the substrate edge, and the spectrum of the output light was observed. Discrete SPR dips can be observed in the output light spectra by selecting the dielectric constant and the thickness of the polymer film, which govern the SPR condition. The sensors with poly( vinyl alcohol) as sensing material were prepared and the water vapor sorption properties were investigated. Furthermore, polyisoprene, poly( vinyl carbazole), poly( methyl methacrylate), and perfluorinated polymer were used as sensing materials, and the detection of various vapors was carried out. (C) 2011 The Japan Society of Applied Physics

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  • Fabrication and Characteristics of Pentacene/Vanadium Pentoxide Field-Effect Transistors

    M. Minagawa, K. Nakai, A. Baba, K. Shinbo, K. Kato, F. Kaneko, C. Lee

    PHYSICS OF SEMICONDUCTORS: 30TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS   1399 ( P1-333 )   627   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Organic field-effect transistors (OFETs) were fabricated using pentacene thin layer, and the effects of inserted Lewis-acid thin layers on electrical properties were investigated. The OFETs have active layers of pentacene and vanadium pentoxide (V2O5) as a Lewis-acid layer. Typical source-drain current (I-DS) vs. source-drain voltage (V-DS) curves were observed under negative gate voltages (V(G)s) application, and the shift of the threshold voltage for FET driving (V-t) to positive side was also observed by V2O5 layer insertion, that is, -2.5 V for device with V2O5 layer and -5.7 V for device without V2O5 layer. It was thought that charge transfer (CT) complexes which were formed at the interface between pentacene and V2O5 layer were dissociated by the applied gate voltage, and the generated holes seem to contribute to drain current and the apparent V-t improvement.

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  • Fabrication and Characteristics of Pentacene/Vanadium Pentoxide Field-Effect Transistors 査読

    M. Minagawa, K. Nakai, A. Baba, K. Shinbo, K. Kato, F. Kaneko, C. Lee

    PHYSICS OF SEMICONDUCTORS: 30TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF SEMICONDUCTORS   1399   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Organic field-effect transistors (OFETs) were fabricated using pentacene thin layer, and the effects of inserted Lewis-acid thin layers on electrical properties were investigated. The OFETs have active layers of pentacene and vanadium pentoxide (V2O5) as a Lewis-acid layer. Typical source-drain current (I-DS) vs. source-drain voltage (V-DS) curves were observed under negative gate voltages (V(G)s) application, and the shift of the threshold voltage for FET driving (V-t) to positive side was also observed by V2O5 layer insertion, that is, -2.5 V for device with V2O5 layer and -5.7 V for device without V2O5 layer. It was thought that charge transfer (CT) complexes which were formed at the interface between pentacene and V2O5 layer were dissociated by the applied gate voltage, and the generated holes seem to contribute to drain current and the apparent V-t improvement.

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  • Gold nanoparticles synthesis used for sensor applications 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Sanong Ekgasit, Chuchaat Thammacharoen, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    PROCEEDINGS OF 2011 INTERNATIONAL CONFERENCE ON ELECTRICAL INSULATING MATERIALS (ISEIM)   395 - 397   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Gold nanoparticles (AuNPs) have a unique property called localized surface plasmon resonance (LSPR). LSPR excitation wavelength is strongly dependent on size of gold nanoparticles. At the LSPR wavelength, gold nanoparticles exhibit an enormous electric field enhancement extended from their surface. We have been synthesized gold nanoparticles using chemical reduction of hydrogen tetrachloroaurate (HAuCl4) with sodium borohydride (NaBH4). The soluble starch was used as a stabilizer. The pH of gold salt solution and concentration of stabilizer were varied to investigate the change of the size and stability of gold nanoparticles. Under basic condition, the gold ion was easily reduced to gold nanoparticles. Then, the smaller size of gold nanoparticles could be observed. The concentration of starch solution also affected on the size and stability of gold nanoparticles. The size of gold nanoparticles was increased with the decreasing of starch concentration. In this work, grating pattern of gold nanoparticles was prepared by imprinting method. There is a possibility to use the grating pattern of gold nanoparticles in SPR grating-coupling method.

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  • Increased short-circuit current in grating-coupled surface plasmon resonance field-enhanced dye-sensitized solar cells 招待 査読

    Akira Baba, Keisuke Wakatsuki, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JOURNAL OF MATERIALS CHEMISTRY   21 ( 41 )   16436 - 16441   2011年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    In this paper, we demonstrate the fabrication of grating-coupled surface plasmon resonance (SPR)-enhanced dye-sensitized solar cells (DSSCs) and their increased short-circuit current properties. DSSCs consisted of a grating substrate/gold/TiO2/dye/electrolyte/indium-tin oxide structure. Blu-ray disc recordables were used as diffraction grating substrates on which gold films were deposited by vacuum evaporation. TiO2 films were prepared on the gold/grating substrates by an electrophoretic deposition technique. 5,10,15,20-Tetrakis (1-methyl-4-pyridinio) porphyrin tetra (p-toluenesulfonate) and sodium copper chlorophyllin layer-by-layer ultrathin films were deposited as the dye layer on the TiO2 films. SPR excitation was observed in the fabricated cells upon irradiation with white light. Up to 4.5-fold increase in the short-circuit photocurrent was observed when the surface plasmon (SP) was excited on the gold gratings as compared with that without SP excitation. Finite-difference time-domain simulation indicated that the electrical field in the dye layer could be increased using the grating-coupled SP technique.

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  • Electropolymerization of Carboxylated Conducting Polymer/CNTs Composites for Use as Immunosensor 査読

    Paphawadee Netsuwan, Saengrawee Sriwichai, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sukon Phanichphant

    PROCEEDINGS OF 2011 INTERNATIONAL CONFERENCE ON ELECTRICAL INSULATING MATERIALS (ISEIM)   27 - 30   2011年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    In this work, electropolymerization of carboxylated conducting polymer/CNTs composites have been studied for construction of surface plasmon resonance immunosensor. The electrochemical experiment was performed in 1.0 M tetrabutylammonium hexafluorophosphate (TBAPF(6)) in acetonitrile containing 10 mM monomers, thianaphthene-2-carboxylic acid and benzothiophene-2-propanoic acid, and CNTs in acetonitrile at scan rate of 20 mV/s using platinum wire as counter electrode and Ag/Ag+ as reference electrode with potential range of 0 V to 1.2 V for 5 cycles. The gold and ITO-coated glass substrates were used as working electrode where the electropolymerization was occurred. The obtained films were characterized by UV-vis absorption spectroscopy, atomic force microscopy and in situ electrochemical-surface plasmon resonance spectroscopy. Further studies about immobilization process are under investigating for this immunosensor system.

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  • Photocurrent Properties in Grating-Coupling Surface Plasmon Resonance Enhanced Dye Sensitized Solar Cell

    Akira Baba, Keisuke Wakatsuki, Gareth Sheppard, Jason Locklin, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    Pacifichem2010   1297   2010年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Transmission Surface Plasmon Resonance Enhanced Microfluidic Biosensing

    Ryuta Kato, Takao Oseki, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Gareth Sheppard, Jason Locklin

    9th International Conference on Nano-Molecular Electronics   PI-7   2010年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Detection of Adrenaline on Poly(3-aminobenzylamine) Ultrathin Film by Electrochemical-Surface Plasmon Resonance Spectroscopy 査読

    Akira Baba, Touru Mannen, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    LANGMUIR   26 ( 23 )   18476 - 18482   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    In this Article, we present a novel method to detect adrenaline on poly(3-aminobenzylamine) (PABA) ultrathin films by electrochemical-surface plasmon resonance (EC-SPR) spectroscopy. We prepared a PABA film, which specifically reacts with adrenaline, on a gold electrode by electropolymerization of 3-aminobenzylamine. The specific reaction of benzylamine within the PABA structure with adrenaline was studied by XPS, UV-vis spectroscopy, and EC-SPR techniques. Adrenaline was detected in real time by EC-SPR spectroscopy, which provides simultaneous monitoring of both optical SPR reflectivity and electrochemical current responses upon injecting adrenaline into the PABA thin film. The number of changes in both current and SPR reflectivity on the injection of adrenaline exhibited the linear relation to the concentration, and the detection limit was 100 pM. The responses were distinctive to those for uric acid and ascorbic acid, which are major interferences of adrenaline.

    DOI: 10.1021/la1034992

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  • Fabrication of Combined Microfluidic Device and Transmission Surface Plasmon Resonance Spectroscopy and Their Biosensor Application

    Akira Baba, Ryuta Kato, Takao Oseki, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Gareth Sheppard, Jason Locklin

    AsiaNANO2010   PB030   2010年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Manipulation of Precursor Carbazole Dendron Polymer Thin Films by Conducting-AFM Nanolithography 査読

    Akira Baba, Ryohei Oyanagi, Takayuki Mashima, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Guoqian Jiang, Rigoberto Advincula

    SSDM 2010   ( A-5-1 )   657 - 658   2010年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Preparation of a Hybrid Sensor of Surface Plasmon Resonance and Quartz Crystal Microbalance by Using Imprinted Grating Structure 査読

    Kazunari Shinbo, Kazutaka Kuroki, Yuki Teshima, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    SSDM 2010   ( A-5-3 )   661 - 662   2010年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Enhanced Photocurrent Generation in Nanostructured Chromophore/Carbon Nanotube Hybrid Layer-by-Layer Multilayers 査読

    Akira Baba, Taihei Matsuzawa, Saengrawee Sriwichai, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Sukon Phanichphant, Futao Kaneko

    JOURNAL OF PHYSICAL CHEMISTRY C   114 ( 35 )   14716 - 14721   2010年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    In this paper, we demonstrate photocurrent generation from nanostructured layer-by-layer (LbL) ultrathin films consisting of chromophores and single-walled carbon nanotubes (SWNT). We fabricated 5,10,15,20-tetrakis(1-methy1-4-pyridinio)porphyrin tetr (p-toluenesulfonate) (TMPyP)-SWNT/sodium copper chlorophyllin (SCC)-SWNT LbL film from noncovalently adsorbed composites. SWNT were dissolved in water-soluble cationic TMPyP and anionic SCC, and the resulting solutions were used for electrostatic LbL multilayer fabrication. The solubility of SWNT in water was studied by UV-vis absorption spectroscopy. The composites were highly dispersed owing to the pi-pi interactions. The fluorescence spectroscopy measurements showed efficient quenching of TMPyP and SCC fluorescence, which was due to the interaction with SWNT. In situ surface plasmon resonance spectroscopy during the LbL multilayer fabrication indicated a stepwise increase in reflectivity, implying the successive formation of nanostructured hybrid ultrathin films. Cyclic voltammetry revealed that the electroactivity of the hybrid film was enhanced by the incorporation of SWNT. The composite LbL film electrode exhibited an enhancement of photocurrent compared to a TMPyP/SCC (no SWNT) film electrode, suggesting efficient charge separation and electron transfer in the system.

    DOI: 10.1021/jp103121m

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  • Imprinting of Grating Structure for SPR on QCM substrate and a Hybrid Sensing for Polymer Thin Film Deposition and Vapor Sorption

    Yuki Teshima, Kazunari Shinbo, Kazutaka Kuroki, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    KJF International Conference on Organic Materials for Electronics and Photonics   108   2010年8月

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  • Poly(pyrrole-3-carboxylic acid) Thin Film Based Electrochemical-Surface Plasmon Resonance Immunosensor for Detection of Human IgG

    Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF International Conference on Organic Materials for Electronics and Photonics   ( PA091 )   102   2010年8月

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  • Fabrication of Grating-Coupling Surface Plasmon Resonance Enhanced Organic Photovoltaic Cell

    Nobutaka Aoki, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF International Conference on Organic Materials for Electronics and Photonics   ( PB023 )   121   2010年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • 金属格子上表面プラズモン励起電場増強色素増感太陽電池の作製と評価

    馬場 暁, 若月 慶介, 新保 一成, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2010 ( 66 )   15 - 18   2010年7月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • Detection of Catecholamines on Electropolymerized Polyaminobenzylamine Thin Films by Electrochemical-Surface Plasmon Resonance Spectroscopy

    Akira Baba, Touru Mannen, Hiroki Sato, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    International Conference on Nanophotonics   ( P-A87 )   187   2010年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Thin Film Deposition and Vapor Detection Utilizing a Hybrid Sensor of QCM and SPR Techniques

    Kazunari Shinbo, Hiroshi Ishikawa, Takumasa Kato, Yoshinori Tsurugai, Kazuya Aida, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    LB13   20   2010年7月

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  • Multiple Vapor Sensing Using Waveguide-based Surface Plasmon Resonance Senso

    Hayato Takahashi, Kenta Mizusawa, Kazunari Shinbo, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    EM-NANO2010   ( PI-33 )   82   2010年6月

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  • Fabrication of Grating Films from Metal Nanoparticle

    Ryosuke Yamazaki, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sanong Ekgasit, Chuchaat Thammacharoen

    ISOME2010   ( P-2 )   76 - 77   2010年6月

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  • Effect of Impurity Ions on the Alignment of 5CB Liquid Crystal Molecules Investigated by Surface Plasmon Resonance and Optical Waveguide Spectroscopy

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ISOME2010   ( P-8 )   88 - 89   2010年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitation and Emission Light Properties Using Hybrid Setup of Prism and Grating Coupling

    Yuta Hirano, Masayuki Sakai, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ISOME2010   ( P-10 )   92 - 93   2010年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication of Thiolene-Based Microfluidic Device Combined with Electrochemical-Surface Plasmon Resonance Spectroscopy

    Ryuta Kato, Takao Oseki, Gareth Sheppard, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Jason Locklin

    EM-NANO2010   ( PI-34 )   83   2010年6月

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  • Detection of Human IgG on Poly (pyrrole-3-carboxylic acid) Thin Film by Electrochemical-Surface Plasmon Resonance Spectroscopy

    Rapiphun Janmanee, Akira Baba, Sukon Phanichphant, Saengrawee Sriwichai, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    EM-NANO2010   ( B7-2 )   43   2010年6月

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  • Electrochemically controlled surface plasmon resonance immunosensor for the detection of human immunoglobulin G on poly(3-aminobenzoic acid) ultrathin films 査読

    Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    SENSORS AND ACTUATORS B-CHEMICAL   147 ( 1 )   322 - 329   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    An electrochemically controlled surface plasmon resonance (SPR) immunosensor based on carboxylated polyaniline was constructed for detecting human immunoglobulin G (IgG) without using further labeled molecules. The carboxylated polyaniline, poly(3-aminobenzoic acid) (PABA), was prepared by electropolymerization of its monomer, 3-aminobenzoic acid (ABA), on a gold-coated high-refractive-index glass slide that was also used as a working electrode for the electrochemical system. The kinetic properties during electropolymerization were monitored in situ with electrochemical-surface plasmon resonance (EC-SPR) spectroscopy. The obtained PABA film, which was used to construct the immunosensor, showed electroactivity in neutral phosphate-buffered saline solution. The carboxylic acid surface of the PABA film was then activated to immobilize anti-human IgG. Finally, the immunosensor electrode was used to probe the binding reaction of anti-human/human IgG with various concentrations of human IgG at different constant applied potentials. The immobilization and binding reaction processes were controlled and also studied in situ by EC-SPR spectroscopy. The binding process at different applied potentials was studied and fitted using the Freundlich model. The surface morphology of the films after the immobilization of anti-human IgG was studied by atomic force microscopy. (c) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.snb.2010.03.031

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  • 表面プラズモン・導波モード同時励起型全反射減衰法によるSiO_2配向膜上5CB液晶分子の配向評価

    五十嵐 彩, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   130 ( 2 )   193 - 197   2010年2月

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    In this study, we report on the evaluation of tilt angles of liquid crystal (LC) molecules near the surface of SiO<sub>2</sub> alignment layers and in the whole cell when constant voltages are applied. A LC molecule, 4-cyano-4'n-pentylbiphenyl, was used in this study. The LC cell consisted of Au (50nm) / SiO<sub>2</sub> (30nm) /LC (3 &mu;m)/ SiO<sub>2</sub> (30nm) / Au (100nm) system. SiO<sub>2</sub> alignment layers were obliquely evaporated on both Au surfaces. Surface plasmon resonance and guided waveguide excitation modes in attenuated total reflection configuration were used to monitor the alignment property of LC molecules adjacent to the surface and the bulk in the LC cell. In the ATR angular scan properties, the theoretical fittings agreed well with the experimental data on the assumption of simplified 5 LC layers model. The profile of the tilt angles from the surface to inside the cells was obtained by the theoretical fitting. In comparison with the internal bulk region, LC molecules near the surface required higher voltages to change their tilt angles toward vertical direction. As demonstrated in this report, this technique should provide the useful information to understand the interfacial phenomena for LC displays.

    DOI: 10.1541/ieejfms.130.193

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  • 細管内金属ワイヤ電極を用いたエレクトロスピニング法による高分子ファイバの作製と構造観察

    小野塚 信太郎, 星野 力也, 水野 佳紀, 新保 一成, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   130 ( 2 )   219 - 220   2010年2月

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    We fabricated electrospun poly (vinylalcohol) (PVA) fibers using a copper wire electrode in Teflon capillary tube, and the SEM images were observed. The apparatus in this method is reasonable, and needed volume of polymer solution and distance between the electrodes can be largely reduced compared to conventional method. The wire electrode tip position in the capillary tube is also important in this method and should be close to the polymer solution surface.

    DOI: 10.1541/ieejfms.130.219

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  • 表面プラズモン・導波モード同時励起型全反射減衰法によるSiO<sub>2</sub>配向膜上5CB液晶分子の配向評価

    五十嵐彩, 馬場 暁, 新保 一成, 加藤 景三, 金子双男

    電気学会論文誌A   130 ( 2 )   219 - 220   2010年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Nanostructured carbon nanotubes/copper phthalocyanine hybrid multilayers prepared using layer-by-layer self-assembly approach 査読

    Akira Baba, Yoshinori Kanetsuna, Saengrawee Sriwichai, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Sukon Phanichphant, Futao Kaneko

    THIN SOLID FILMS   518 ( 8 )   2200 - 2205   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    In this report, we demonstrate a convenient method of fabricating single-walled carbon nanotubes/organic semiconductor hybrid ultrathin multilayers using a layer-by-layer self-assembly approach. Single-walled carbon nanotubes were solubilized by water-soluble cationic alcian blue pyridine variant and anionic copper phthalocyanine-3,4&apos;,4 &apos;&apos;,4&apos;&apos;&apos;-tetrasulfonic acid tetrasodium salt, which were then utilized for electrostatic layer-by-layer multilayer fabrication. The solubilization ability of single-walled carbon nanotubes was studied in water by UV-vis absorption spectroscopy. The composites were highly dispersed owing to the pi-pi interactions. In situ surface plasmon resonance spectroscopy during the layer-by-layer multilayer fabrication indicated a stepwise increase in reflectivity, indicating the successive formation of nanostructured hybrid ultrathin films. Cyclic voltammetry revealed that the electroactivity of the hybrid film was enhanced by the incorporation of single-walled nanotubes. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2009.09.052

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  • Preparation of Electrospun Polymer Fibers Using a Copper Wire Electrode in a Capillary Tube 査読

    Kazunari Shinbo, Shintaro Onozuka, Rikiya Hoshino, Yoshinori Mizuno, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 4 )   1168 - 1169   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Polymer fibers were prepared by an electrospinning method utilizing a copper wire electrode in a capillary tube. The morphology of electrospun poly(vinyl alcohol) (PVA) fibers was observed, and was found to be dependent on the wire electrode tip position in the capillary tube, the concentration of the polymer solution, the distance between the electrodes, and the applied voltage. By using the wire electrode, the experimental setup is simple and the distance between the electrodes and the applied voltage can be easily reduced. Furthermore, the preparation of poly(3-hexylthiophene) (P3HT) fibers was carried out. P3HT fibers were successfully prepared by mixing poly(ethylene oxide) (PEO) in P3HT solution. Orientation control was also carried out by depositing the fibers on a rotating collector electrode, and the alignment of the P3HT: PEO fibers was confirmed. Anisotropy of the optical absorption spectra was also observed for the aligned fibers. (C) 2010 The Japan Society of Applied Physics

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  • Fabrication and Evaluation of Poly(3-hexylthiophene) Field-Effect Transistor With V2O5 Layer 査読

    Masahiro Minagawa, Tetsuyuki Higashikawa, Kentaro Nakai, Kazunari Shinbo, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   519   213 - 221   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Organic field-effect transistors (OFETs) were fabricated using poly(3-hexyl thiophene) (P3HT), and the effects of inserted Lewis-acid thin layers on electrical properties were investigated. The OFETs have active layers of P3HT and vanadium pentoxide (V2O5) as a Lewis-acid layer. Larger drain currents were observed for the OFET with the V2O5 layer than that without the layer. The calculated field-effect mobility of the fabricated OFET was 1.4 x 10(-2) cm(2) / (Vs), where as that of the OFET without the V2O5 layer was 6.2 x 10(-3) cm(2) / (Vs). It was thought that charge transfer (CT) complex which was formed at the interface between P3HT and V2O5 layer was dissociated by gate voltage, and the generated holes seem to contribute to drain current and the apparent high mobility.

    DOI: 10.1080/15421401003597977

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  • Alignment Properties of Liquid Crystal Molecules under AC and DC Voltage Application Studied by Surface Plasmon Resonance and Optical Waveguide Spectroscopy 査読

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 4 )   04DK22-1 - 04DK22-4   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    In this study, we report the evaluation of the tilt angle of liquid crystal (LC) molecules near the surface of SiO2 alignment layers and in the whole cell when AC and/or DC voltages are applied. The LC molecule 4-cyano-4'-n-pentylbiphenyl was used. The LC cell consisted of a Au (50 nm)/SiO2 (30 nm)/LC (3 mm)/SiO2 (30 nm)/Au (100 nm) system. Surface plasmon resonance (SPR) spectroscopy and optical waveguide spectroscopy (OWS) in an attenuated total-reflection configuration were used to monitor the alignment properties of LC molecules. From the SPR/OWS angular scan properties, the profile of the tilt angle from the surface to inside the cell was obtained. Furthermore, the effect of space-charge polarization on the LC alignment properties was observed from the SPR kinetic properties. As demonstrated in this report, this technique should provide useful information for understanding the interfacial phenomena in LC displays. (C) 2010 The Japan Society of Applied Physics

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  • In-Situ Investigation of Tilt Angles of 5CB LC Molecules on SiO2 Alignment Layer Using Surface Plasmon Resonance/Optical Waveguide Spectroscopy 査読

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   519   128 - 133   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    In this study, we report on evaluation of liquid crystal (LC) cells using simultaneous surface plasmon resonance (SPR) and optical waveguide spectroscopy (OWS) technique in attenuated total reflection configuration. This technique allows for in-situ monitoring of alignment property of LC molecules adjacent to the surface and the bulk in the LC cell simultaneously. An increase of the hysteresis both for near the surface and whole cell was observed in SPR/OWS kinetic properties as the number of voltage cycling increased. The LC alignment properties after applying a DC voltage were also measured to study the effect of impurity residual ions in LC cells.

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  • Multimode Surface Plasmon Excitations on Organic Thin Film/Metallic Diffraction Grating 査読

    Akira Baba, Kenji Kanda, Tsutomu Ohno, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 1 )   01AE02-1 - 01AE02-4   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    In this work, we demonstrate multimode surface plasmon (SP) excitations by white light irradiation on metallic diffraction grating/plastic substrates. Recordable compact discs were used as the diffraction grating substrates on which silver films were deposited by vacuum evaporation. Since the grating pitch (1.6 mu m) was larger than that of diffraction gratings commonly used for the excitation of SPs, multimode SP excitations due to several diffraction orders were observed simultaneously in the wavelength region from 400 to 800 nm. The obtained SP excitations were then compared with the calculated SP dispersion on the grating. The multimode SP excitations were further studied on spin-coated poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film/silver grating substrates. An increased photoluminescence intensity due to SP excitations was observed on MEH-PPV/silver grating surfaces. (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.49.01AE02

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  • Preparation of Electrospun Polymer Fibers Using a Copper Wire Electrode in a Capillary Tube 査読

    Kazunari Shinbo, Shintaro Onozuka, Rikiya Hoshino, Yoshinori Mizuno, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   49 ( 4 )   04DK24-1 - 04DK24-5   2010年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Polymer fibers were prepared by an electrospinning method utilizing a copper wire electrode in a capillary tube. The morphology of electrospun poly(vinyl alcohol) (PVA) fibers was observed, and was found to be dependent on the wire electrode tip position in the capillary tube, the concentration of the polymer solution, the distance between the electrodes, and the applied voltage. By using the wire electrode, the experimental setup is simple and the distance between the electrodes and the applied voltage can be easily reduced. Furthermore, the preparation of poly(3-hexylthiophene) (P3HT) fibers was carried out. P3HT fibers were successfully prepared by mixing poly(ethylene oxide) (PEO) in P3HT solution. Orientation control was also carried out by depositing the fibers on a rotating collector electrode, and the alignment of the P3HT: PEO fibers was confirmed. Anisotropy of the optical absorption spectra was also observed for the aligned fibers. (C) 2010 The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.49.04DK24

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  • Grating Coupling Surface Plasmon Excitations and Application to Organic Devices

    Keizo Kato, Akira Baba, Kazunari Shinbo, Futao Kaneko

    9th Int. Discussion & Conf. on Nano Interface Controlled Electronic Devices   ( O6-1 )   56 - 57   2009年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A hybrid humidity sensor using optical waveguides on a quartz crystal microbalance 査読

    Kazunari Shinbo, Shunya Otuki, Yuichi Kanbayashi, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    THIN SOLID FILMS   518 ( 2 )   629 - 633   2009年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    In this study, stab and ridge optical waveguides (OWGs) made of fluorinated polyimides were deposited on a quartz crystal microbalance (QCM), and hybrid sensors using OWG spectroscopy and the QCM technique were prepared. Polyvinyl alcohol (PVA) film with CoCl(2) was deposited on the OWGs, and the characteristics of humidity sensing were investigated. A prism coupler was used to enter a He-Ne laser beam (lambda = 632.8 nm) to the slab OWG. The output light intensity markedly changed due to chromism of the CoCl(2) as a result of humidity sorption, and this change was dependent on the incident angle of the laser beam to the slab OWG. During the measurement of output light, the QCM frequency was simultaneously monitored. The humidity dependence of the sensor with the slab OWG was also investigated in the range from 15 to 85%. For the sensor with the ridge OWG, white light was entered by butt-coupling, and the characteristics of humidity sensing were investigated by observing the output light spectrum and the QCM frequency. (C) 2009 Published by Elsevier B.V.

    DOI: 10.1016/j.tsf.2009.07.059

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  • Electrochemical surface plasmon excitation and emission light properties in poly(3-hexylthiophene) thin films 査読

    Keizo Kato, Kazuki Yamashita, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Futao Kaneko

    THIN SOLID FILMS   518 ( 2 )   758 - 761   2009年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The attenuated total reflection (ATR) and emission light properties utilizing surface plasmon (SP) excitations were measured for the electrochemical change of poly(3-hexylthiophene-2,5diyl) (P3HT) thin films in-situ. The SP emission light could detect the SP excited by molecular luminescence of P3HT. The ATR and SP emission light properties were observed for the doped-dedoped states of P3HT thin film. The ATR and SP emission light properties were remarkably changed with the electrochemical doping and dedoping. The SP emission light also decreased by decrease of the molecular luminescence of P3HT by doping. For the dedoped-state P3HT thin film, SP emission light also increased by increase of the molecular luminescence. The SP emission light excited by molecular luminescence can be controlled by the control of doping-dedoping state. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2009.07.083

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  • Evaluation of 5CB Liquid Crystal Molecules on SiO2 Alignment Layer by Simultaneous Surface Plasmon Resonance and Optical Waveguide Spectroscopy 査読

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    SSDM 2009   ( F-8-4 )   1172 - 1173   2009年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Resonance Sensor Using Grating Coupling Multimode Excitations 査読

    Ryosuke Yamazaki, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Satya Samanta, Jason Locklin

    SSDM 2009   ( P-10-22 )   659 - 660   2009年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Vapor Sensing by Using Multi-Channel Waveguide-based Surface Plasmon Resonance

    Kazunari Shinbo, Kenta Mizusawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    KJF 2009   ( P4 )   40   2009年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Electrochromic Properties of Metallopolymer Ultrathin Films Prepared by Layer-by-Layer Self-Assembly Technique

    Yuta Yashiro, Akira Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Satya Samanta, Jason Locklin

    KJF 2009   ( P230 )   266   2009年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • In-situ Investigation of Tilt angles of 5CB LC molecules on SiO2 Alignment layer using Surface Plasmon Resonance/Optical Waveguide Spectroscopy

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF 2009   ( P30 )   66   2009年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication and Evaluation of Poly (3-hexylthiophene) Field-Effect Transistor with V2O5 Layer

    Tetsuyuki Higashikawa, Masahiro Minagawa, Akira Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF 2009   ( P87 )   123   2009年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface plasmon resonance immunosensor based on electropolymerized poly(3-aminobenzoic acid) for label-free detection of human IgG

    Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   238 ( PMSE 480 )   2009年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER CHEMICAL SOC  

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  • Surface plasmon resonance immunosensor based on electropolymerized poly(3-aminobenzoic acid) for label-free detection of human IgG 査読

    Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   238   2009年8月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

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  • Fabrication and Characteristics of Field-Effect Transistors with Vanadium Pentoxide and Copper Phthalocyanine Multilayers 査読

    Masahiro Minagawa, Syohei Kitamura, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    APPLIED PHYSICS EXPRESS   2 ( 7 )   0715021-1 - 0715021-3   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOCIETY APPLIED PHYSICS  

    Organic field-effect transistors (OFETs) with copper phthalocyanine (CuPc) and vanadium pentoxide (V(2)O(5)) films were fabricated (top-contact electrode/V(2)O(5)/CuPc/SiO(2)/Si/gate electrode structure), and their electrical properties were investigated. The drain current increased due to the insertion Of V(2)O(5) layer, and it was considered to be due to a formation of charge transfer complex between V(2)O(5) and CuPc. The ON/OFF ratio of the OFETs was higher than that of previously reported OFETs with a top-contact electrode/CuPc/V(2)O(5)/SiO(2)/Si/gate electrode structure. The off-current of the OFETs in this study was maintained small so that few carriers would contribute to the current conduction in the off-state. (C) 2009 The Japan Society of Applied Physics

    DOI: 10.1143/APEX.2.071502

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  • Preparation and Properties of Bio-Based Epoxy Montomorillonite Nanocomposites Derived from Polyglycerol Polyglycidyl Ether and epsilon-Polylysine 査読

    Yoshiro Takada, Kiyomi Shinbo, Yoshihiro Someya, Mitsuhiro Shibata

    JOURNAL OF APPLIED POLYMER SCIENCE   113 ( 1 )   479 - 484   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JOHN WILEY & SONS INC  

    Glycerol polyglycidyl ether (GPE) and polyglycerol polyglycidyl ether (PGPE) were cured with epsilon-poly(L-lysine) (PL) using epoxy/amine ratios of 1 : 1 and 2 : 1 to create bio-based epoxy cross-linked resin and the epoxy/amine ratio was 1 : 1, the cured neat resin showed the greatest glass transition temperature (T(g)), as measured by differential scanning calorimetry. Next, the mixture of PGPE, PL, and montomorillonite (MMT) at an epoxy/amine ratio of 1 : 1 in water was dried and cured finally at 110 degrees C to create PGPE-PL/MMT composites. The X-ray diffraction and transmission electron microscopy measurements revealed that the composites with MMT content 7-15 wt % were exfoliated nanocomposites and the composite with MMT content 20 wt % was an intercalated nanocomposite. The T(g) and storage modulus at 50-100 degrees C for the PGPE-PL/MMT composites measured by DMA increased with increasing MMT content until 15 wt % and decreased at 20 wt %. The tensile strength and modulus of the PGPE-PL/MMT composites (MMT content 15 wt % 42 and 5300 MPa) were much greater than those of the cured PGPE-PL resin (4 and 6 MPa). Aerobic biodegradability of the PGPE-PL in an aqueous medium was similar to 4% after 90 days, and the PGPE-PL/MMT nanocomposites with MMT content 7-15 wt % showed lower biodegradability. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 479-484, 2009

    DOI: 10.1002/app.30015

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  • Fabrication of Fluorescence Tunable Electrospun Poly(N-vinylcarbazole) Fibers Containing Gold Nanoparticles

    Akira Baba, Takumi Nakatsukasa, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    20th Int.Conf.on Molecular Electronics & Devices   ( IL8 )   17 - 18   2009年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Thermal Properties of Conduction Current and Carrier Behavior in an Organic Electroluminescent Device 査読

    Masahiro Minagawa, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ELECTRONICS AND COMMUNICATIONS IN JAPAN   92 ( 3 )   24 - 31   2009年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    Organic electroluminescent device (OLED) was fabricated using a vacuum evaporation method and thermal properties were investigated. The OLED has an indium tin oxide (ITO)/N,N&apos;-Biphenyl-N,N&apos;-bis(3-methylphenyl)-1,1&apos;-biphenyl-4,4&apos;-diamine (TPD)/tris(8-hydroxyquinoline) aluminum (Alq)/lithium fluoride (LiF)/aluminum (AI) structure. An electron-dominant device of Al/Alq/LiF/Al structure, or it hole-dominant device of ITO/TPD/Al structure was also fabricated in order to study the carrier behavior in the OLEDs. The current density versus voltage (J-V) properties with various thickness of organic layers were investigated in both electron- and hole-dominant devices, and the thermal dependence of J-V properties was observed in the devices. At room temperature, conductions in a wide current region were considered to be due to space-charge-limited current for all of the devices. Especially for the Al/Alq/LiF/Al device and the OLED, J proportional to V(m+1) relationships were observed across a wide current region. At low temperature, tunnel currents were estimated for the ITO/TPD/Al device. For the Al/Alq/LiF/Al device and the OLED, J proportional to V(m+1) relationships were observed across a wide current region at low temperature. (C) 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 92(3): 24-31, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10048

    DOI: 10.1002/ecj.10048

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  • Multimode Surface Plasmon Excitations on Metallic Diffraction Gratings/Organic Thin Films

    Akira Baba, Ryosuke Yamazaki, Kenji Kanda, Tsutomu Ohno, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    5th Int. Conf. on Molecular Electronics and Bioelectronics   ( B-O8 )   77   2009年2月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Investigation of Electrode position of Palladium Nanoparticles on Single-Walled Carbon Nanotubes

    Yohsuke Sano, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    Int.Symp. on Fusion Tech 2009   18   2009年1月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Multichannel Measuring Method of Waveguide-Based Surface Plasmon Resonance Sensor

    Kenta Mizusawa, Kazunari Shinbo, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    Int.Symp. on Fusion Tech 2009   56   2009年1月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Molecular manipulation and nanofabrication using local polarization in optical near-fields 査読

    Yasuo Ohdaira, Kazunari Shinbo, Akira Baba, Keizo Kato, Futao Kaneko

    PLASMONICS: NANOIMAGING, NANOFABRICATION, AND THEIR APPLICATIONS V   7395   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPIE-INT SOC OPTICAL ENGINEERING  

    We demonstrate nanofabrication of photoreactive azobenzene molecular thin films using optical migration of molecules induced by local polarization in optical near-fields. Transportation and alignment control of the nanomaterial systems were investigated to modulate the excitation of the optical near-fields. Energy transfers from fluorescent molecules were observed along a planar boundary system of metals and dielectrics. The fundamental processes of tunneling energy that flowed to the metallic layer were evaluated from the angular distribution of scattered light in a far field, corresponding to the angular spectrum of scattered fields, including those of evanescent waves excited near the fluorescent molecules and nanostructures fabricated on azo molecular films.

    DOI: 10.1117/12.825955

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  • Evaluation of Photoreactive Azo Dye Molecular Thin Films Utilizing an Optical Interferometer with Evanescent Wave Illumination 査読

    Yasuo Ohdaira, Kazumasa Banba, Kengo Murotani, Takamasa Suzuki, Osami Sasaki, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   504   114 - 123   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    A new Mach-Zehnder type optical-interferometer utilizing evanescent wave illuminations of a reflected beam at a prism surface was constructed to evaluate photoreactive molecular thin films on a prism surface. Refractive index changes of the films due to photoisomerization of azo molecules on the prism caused by an irradiation beam were observed from phase changes between an incident beam and the reflected one at the prism surface. Real-time measurements were also demonstrated using the interferometer microscopy, exhibiting two dimensional distributions of the refractive indices in the molecular films partially excited by the focused irradiation laser beam.

    DOI: 10.1080/15421400902946103

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  • A Hybrid Humidity Sensor using Optical Waveguide on Quartz Crystal Microbalance

    Shunya Otsuki, Kazunari Shinbo, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    8th Int. Conf. on Nano-Molecular Electronics   ( PI-13 )   136 - 137   2008年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Electrochemical Surface Plasmon Excitation and Emission Light Properties in Poly(3-hexylthiophene) Thin Films

    Keizo Kato, Kazuki Yamashita, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Futao Kaneko

    8th Int. Conf. on Nano-Molecular Electronics   ( PII-2 )   266 - 267   2008年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Surface Alignment of LC Using Surface Plasmon Resonance Spectroscopy

    Aya Ikarashi, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IDW 2008   ( LCT2 )   3   2008年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Electrocatalytic Oxidation Properties of Ascorbic Acid at Poly(3,4-ethylenedioxythiophene) Films Studied by Electrochemical-Surface Plasmon Resonance Spectroscopy 査読

    Akira Baba, Yohsuke Sano, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 12 )   1881 - 1882   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this report. we demonstrate electrocatalytic oxidation properties of ascorbic acid at poly(3,4-ethylenedioxythiophene) (PEDOT) thin films in view of their potential application for big-sensing devices. PEDOT thin films were deposited on gold thin films by electropolymerization of EDOT monomer in acetonitrile solvent. In-situ electrochemical-surface plasmon resonance spectroscopy (EC-SPR) was used to detect both electrochemical and optical signals upon an injection of ascorbic acid.

    DOI: 10.1093/ietele/e91-c.12.1881

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  • Surface Plasmon Excitation and Emission Light Property for Otto/Kretschmann Configuration with MEH-PPV Film 査読

    Megumi Hafuka, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 12 )   1883 - 1884   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Attenuated total reflection (ATR) property utilizing surface plasmon (SP) excitation was investigated for BK-7 prism/MgF2/Ag film/fluorescent organic dye film structure. In the structure, it is expected that SPs are excited at MgF2/Ag and Ag/dye film interfaces by Otto and Kretschmann configurations, respectively. In the experimental ATR curve, reflection dips for the SP excitations at the interfaces could be detected. Furthermore. SP emission lights were observed by irradiation of Ar ion laser beam from the dye film side. The SP emission light curve with two peaks was observed and it was also considered that the peaks corresponded to the SP excitation of Otto and Kretschmann Configurations. The SP emission light spectra indicated the excited fluorescent dyes induced the SP emission lights. Intense emission light of Otto configuration was observed in this sample.

    DOI: 10.1093/ietele/e91-c.12.1883

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  • Fabrication of Single-Wall Carbon Nanotubes/Organic Semiconductor Hybrid Multilayers Prepared Using Layer by-Layer Self-Assembly Approach

    Akira Baba, Yoshinori Kanetsuna, Taihei Matsuzawa, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    Asia NANO 2008   ( B-01 )   6   2008年11月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitations and Emission Lights in Nanostructured Organic Thin Films with Luminescent Dye Layers

    Keizo Kato, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Futao Kaneko

    8th Int. Discussion & Conf. on Nano Interface Controlled Electronic Devices   ( OA10 )   38 - 39   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Properties of Ultrathin Metallopolymers Prepared by Layer-by-Layer Self-Assembly Technique

    Yuta Yashiro, Akira Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Satya Samanta, Jason Locklin

    KJF2008   ( P23 )   97   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Emission Light from Prism/MgF2/Ag/MEH-PPV Thin Film Structure

    Kazunari Shinbo, Megumi Hafuka, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    KJF2008   ( P25 )   95   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Poly(3-aminobenzoic acid)-based Immunosensor for Detection of Human Immunoglobulin G

    Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF2008   ( P23 )   35   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Spatial distribution measurement of refractive index changes in azomolecular film utilizing evanescent wave interferometer

    Yasuo Ohdaira, Kazumasa Banba, Kengo Murotani, Akira Baba, Kazunari Shinbo, Osami Sasaki, Keizo Kato, Futao Kaneko

    KJF2008   48   2008年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Adsorption and Surface Plasmon Emission Light of Polystyrene Spheres with Fluorescent Dye on Ag Thin Film

    Kazunari Shinbo, Hiroshi Miura, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 10 )   1663 - 1668   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this study, attenuated total reflection (ATR) utilizing surface plasmon (SP) excitation and SP emission lights were observed for the adsorption of polystyrene (PS) spheres and a water-soluble polymer. The PS spheres contained fluorescent dyes and exhibited red fluorescence. The ATR properties indicated film deposition with increasing number of adsorption cycles. The SP emission light induced by the fluorescent dye ill the spheres was also measured. and all increase in the peak intensity, as well as an angle shift. was observed. Furthermore, the SP emission light spectra were investigated at various emission angles. The dispersion relation obtained front the SP emission light almost corresponded to that obtained from the ATR curves.

    DOI: 10.1093/ietele/e91-c.10.1663

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  • Hybrid gas sensing utilizing localized surface plasmons of gold colloid and a quartz crystal microbalance 査読

    Kazunari Shinbo, Hiroyuki Furukawa, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    THIN SOLID FILMS   516 ( 24 )   9020 - 9024   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Gas sensing properties were investigated using localized surface plasmons (LSPs) and a quartz crystal microbalance (QCM). A thin film of polyvinylalcohol (PVA) and gold colloid (20 ran in diameter) was deposited on the QCM substrate, and the gas responses of the optical absorption of gold colloid LSP and the QCM frequency were simultaneously observed. Vapors of water, ethanol and methylamine in N-2 were detected. The optical absorption spectra changed with the gas adsorption and desorption, and the gas response could be repeatedly observed. Furthermore, the relationship between the QCM frequency and the optical properties depended on the vapor species. Hybrid sensing can be used for detection and discrimination of various vapor adsorptions. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2007.11.110

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  • Adsorption and Surface Plasmon Emission Light of Polystyrene Spheres with Fluorescent Dye on Ag Thin Film 査読

    Kazunari Shinbo, Hiroshi Miura, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 10 )   1663 - 1668   2008年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In this study, attenuated total reflection (ATR) utilizing surface plasmon (SP) excitation and SP emission lights were observed for the adsorption of polystyrene (PS) spheres and a water-soluble polymer. The PS spheres contained fluorescent dyes and exhibited red fluorescence. The ATR properties indicated film deposition with increasing number of adsorption cycles. The SP emission light induced by the fluorescent dye ill the spheres was also measured. and all increase in the peak intensity, as well as an angle shift. was observed. Furthermore, the SP emission light spectra were investigated at various emission angles. The dispersion relation obtained front the SP emission light almost corresponded to that obtained from the ATR curves.

    DOI: 10.1093/ietele/e91-c.10.1663

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  • Detection of Catecholamines with Poly(3-aminobenzylamine) Thin Films Using Electrochemical-Surface Plasmon Resonance Spectroscopy

    Akira Baba, Touru Mannen, Ryohei Ishigami, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuko Fukuda, Hirobumi Ushijima

    SSDM 2008   ( I-6-2 )   812 - 813   2008年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • A Hybrid Sensing Method Utilizing Surface Plasmon Resonance and Quartz Crystal Microbalance

    Kazunari Shinbo, Yoshinori Tsurugai, Kazuya Aida, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    SSDM 2008   ( I-6-3 )   814 - 815   2008年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication of Polymer Nano-Fibers using Electrospinning Method with a Wire Electrode in a Capillary Tube

    Futao Kaneko, Yoshinori Mizuno, Rikiya Hoshino, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato

    US-Japan POLYMAT2008 Summit   25   2008年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Manipulation of Conjugated Precursor Polymer Thin Films by AFM Nanolithography

    Akira Baba, Ryohei Oyanagi, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Guoqian Jiang, Rigoberto Advincula

    US-Japan POLYMAT2008 Summit   27   2008年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Characteristics of Phthalocyanine Field- Effect Transistors with Solvent Vapor Treatment and V2O5 Insertion

    Kazunari Shinbo, Yasuo Takatsuka, Toshiyuki Akazawa, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    ECOF 2008   P61   2008年7月

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  • Electrochemical Surface Plasmon Resonance and Emission Light Properties in Poly(3-hexylthiophene) Thin Films

    Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ECOF 2008   P38   2008年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Nanostructured Carbon Nanotubes/ Organic Semiconductor Hybrid Multilayers Prepared Using Layer-by-Layer Self-Assembly Approach

    Akira Baba, Yoshinori Kanetsuna, Taihei Matsuzawa, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    CARBON 2008   15-P-I70   2008年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Morphology of Polymer Fibers Prepared Using Electrospinning Method with a Copper Wire Electrode in a Capillary Tube

    Kazunari Shinbo, Yoshinori Mizuno, Rikiya Hoshino, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    European MaterialsResearch Society   ( Q-25 )   16 39   2008年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Modification of Surface Morphology and Structures of Electrospun Poly(Nvinylcarbazole) Fibers by Means of Electrochemical Cross-Linking

    Akira Baba, Akihisa Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    European MaterialsResearch Society   ( Q-12 )   9 72   2008年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitation and Emission Light Property for Otto/Kretschmann Configuration with MEH-PPV Film Prism

    M.Hahuka, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ISOME2008   ( 4C-1 )   29   2008年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Humidity adsorption and surface plasmon excitation of poly(vinyl alcohol) films with fluorescent microspheres 査読

    Yutaka Kobayashi, Makoto Fukushima, Akira Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 2 )   1110 - 1114   2008年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    In this study, thin films of poly(vinyl alcohol) (PVA) mixed with 100 nm polystyrene (PS) microspheres were prepared, and changes in attenuated total reflection (ATR) utilizing surface plasmon (SP) excitation due to the adsorption of humidity were investigated. The PS microspheres contained luminescent dyes, and SP emission light due to these dyes was observed. The sample configuration was prism/Ag film (50 nm)/PVA film with sphere. ATR dip and SP emission peak angles shifted with the adsorption and desorption of humidity, and SP emission light intensity changed markedly. Furthermore, kinetic curves were plotted and humidity adsorption responses were repeatedly observed. Finally, the dispersion relations of SPs were obtained from ATR and SP emission light properties.

    DOI: 10.1143/JJAP.47.1110

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  • Characteristics of field-effect transistors with vapor-treated magnesium phthalocyanine films 査読

    Kazunari Shinbo, Toshiyuki Akazawa, Yasuhito Takatsuka, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 1 )   484 - 487   2008年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Vapor treatments using several organic solvents were carried out for vacuum-evaporated magnesium phthalocyanine (MgPc) thin films. The UV-vis absorption spectra, surface morphologies, and X-ray diffraction patterns were markedly altered by the treatments and depend on the vapor. Furthermore, Au top-contact organic field-effect transistors (OFETs) were fabricated using MgPc films with and without the vapor treatments. The FET with N-methylpyrrolidone treatment did not work, but that with dichloromethane vapor treatment showed a large improvement in the on/off ratio and field-effect mobilities. Ethanol vapor treatment (5 min) also improved the FET characteristics, but long-term treatment (60 min) induced poor performance.

    DOI: 10.1143/JJAP.47.484

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  • Electrocatalytic oxidation properties of ascorbic acid at poly(3,4-ethylenedioxythiophene) films studied by electrochemical-surface plasmon resonance spectroscopy

    Akira Baba, Yohsuke Sano, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE Transactions on Electronics   E91-C ( 12 )   1881 - 1882   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electronics, Information and Communication, Engineers, IEICE  

    In this report, we demonstrate electrocatalytic oxidation properties of ascorbic acid at poly(3,4-ethylenedioxythiophene) (PEDOT) thin films in view of their potential application for bio-sensing devices. PE-DOT thin films were deposited on gold thin films by electropolymerization of EDOT monomer in acetonitrile solvent. In-situ electrochemical-surface plasmon resonance spectroscopy (EC-SPR) was used to detect both electrochemical and optical signals upon an injection of ascorbic acid.

    DOI: 10.1093/ietele/e91-c.12.1881

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  • Multimode Surface Plasmon Excitation on Metallic Diffraction Gratings 査読

    Akira Baba, Kenji Kanda, Tsutomu Ohno, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    ISEIM 2008: PROCEEDINGS OF 2008 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING   73 - 73   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INST ELECTR ENGINEERS JAPAN  

    DOI: 10.1109/ISEIM.2008.4664572

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  • Electropolymerized Poly(3-aminobenzoic acid)-Based Surface Plasmon Resonance Immunosensor 査読

    Saengrawee Sriwichai, Akira Baba, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Sukon Phanichphant

    ISEIM 2008: PROCEEDINGS OF 2008 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING   105 - 105   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INST ELECTR ENGINEERS JAPAN  

    DOI: 10.1109/ISEIM.2008.4664451

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  • Preparation and Evaluation of Phthalocyanine/Vanadium Oxide Field-effect Transistors 査読

    Y. Takatsuka, S. Kitamura, T. Akazawa, T. Takahashi, M. Minagawa, Y. Ohdaira, A. Baba, K. Shinbo, K. Kato, F. Kaneko

    ISEIM 2008: PROCEEDINGS OF 2008 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING   72 - 72   2008年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INST ELECTR ENGINEERS JAPAN  

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  • Signal enhancement and tuning of surface plasmon resonance in Au nanoparticle/polyelectrolyte ultrathin films 査読

    Guoqian Jiang, Akira Baba, Hiroshi Ikarashi, Risheng Xu, Jason Locklin, Khan Rana Kashif, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Rigoberto Advincula

    JOURNAL OF PHYSICAL CHEMISTRY C   111 ( 50 )   18687 - 18694   2007年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    Investigations on optical and dielectric properties of hybrid ultrathin layer-by-layer (LbL) films of gold nanoparticles (AuNPs) and polyelectrolytes under different pH conditions resulted in surface plasmon resonance (SPR) signal enhancement under attenuated total reflection (ATR) spectroscopy conditions. Theoretical considerations on the basis of the Maxwell-Garnett theory were made to compare with experimental results. LbL films with different layer architectures were fabricated from AuNPs and two polyelectrolytes: poly(allylamine hydrochloride) (PAH) and poly(styrene sulfonate) (PSS) on Au and Ag thin film substrates for ATR. UV-vis spectroscopy and SPR spectroscopy were applied to study LbL film growth and monitor SPR shift upon pH switching. The (PAH/AuNPs)(x) multilayers showed an interesting dual-responsive SPR change as a function of pH and distance between AuNP layers and metal film. The addition of (PAH/PSS)(y) layers was found to act as an effective cushion to enhance this SPR response due to the significant swelling/shrinking of the film. In the case of [(PAH/PSS)(y) + (PAH/AuNPs)(x)], both theoretical calculations and experimental results showed that the SPR response can either (a) move toward lower incident angle with a sharp peak shape upon swelling in pH = 2 or (b) shift to a higher angle with a broadened peak shape after contraction in pH = 10. This effect was found to be opposite to what is expected from LbL films made up of the polyelectrolytes alone. Moreover, increasing the distance between AuNPs and the metal films also decouples this enhancement effect. A two-wavelength experiment (red and green lasers) was used to quantitatively demonstrate this SPR response to pH switching. Finally, SPR imaging was employed to monitor the SPR change with pH switching between 2 and 10 on the [(PAH/PSS)(4) + (PAH/AuNPs)(2)] film. Thus, on the basis of the SPR spectroscopic and SPR imaging pH response, a reproducible and stable sensing system can be successfully fabricated with these films.

    DOI: 10.1021/jp075986e

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  • 有機EL素子における電気伝導の温度特性とキャリア挙動

    皆川 正寛, 新保 一成, 加藤 景三, 金子 双男

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   127 ( 10 )   635 - 641   2007年10月

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    Organic Electroluminescent device (OLED) was fabricated using a vacuum evaporation method and thermal properties were investigated. The OLED has an Indium Tin Oxide (ITO)/ N,N'-diphenyl-N,N'- bis(3-methylphenyl) 1- 1'biphenyl- 4,4'-diamine (TPD)/ tris- (8-hydroxyquinoline) aluminum (Alq)/ Lithium fluoride (LiF)/ aluminum (Al) structure. An electron dominant device of an Al/ Alq/ LiF/ Al structure, or a hole dominant device of an ITO/ TPD/ Al structure was also fabricated in order to study the carrier behavior in the OLEDs. The current density vs. voltage (<i>J-V</i>) properties with various thickness of organic layers were investigated in the both electron and hole dominant devices, and the thermal dependence of <i>J-V</i> properties was observed in the devices. At room temperature, conductions in large current region were considered to be due to space-charge-limited current for all the devices. Especially, for the Al/ Alq/ LiF/ Al device and the OLED, <i>J&prop;V<sup>m+1</sup></i> relationships were observed across wide current region. At low temperature, tunnel currents were estimated for the ITO/TPD/Al device. For the Al/ Alq/ LiF/ Al device and the OLED, <i>J&prop;V<sup>m+1</sup></i> relationships were observed across wide current region at low temperature.

    DOI: 10.1541/ieejfms.127.635

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  • A Hybrid Sensor Utilizing Surface Plasmon Resonance and Quartz Crystal Microbalance Method

    Yoshinori Tsurugai, Kazuya Aida, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Nobuo Miyadera

    KJF 2007   ( P125 )   205   2007年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Humidity Sensor Using Optical Waveguide on Quarts Crystal

    Shunya Otsuki, Kazunari Shinbo, Yasuo Ohdaira, Futao Kaneko, Keizo Kato, Akira Baba, Nobuo Miyadera

    KJF 2007   ( P126 )   206   2007年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Gap Mode Surface Plasmon Emission Lights in Nanostructured Dielectric Thin Films with Luminescent Organic Dyes

    Keizo Kato, Megumi Hafuka, Masaki Imai, Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Futao Kaneko

    KJF 2007   ( P9 )   89   2007年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Comduction Current Properties and Carrier Behaviors in Organic Electroluminescent Diode

    Futao Kaneko, Mashiro Minagawa, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Akira Baba

    KJF 2007   ( O-7 )   76   2007年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitation and Emission Light properties for Prism/ MgF2/Ag/MEH-PPV Film Structure 査読

    Kazunari Shinbo, Megumi Hafuka, Masahiro Minagawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko

    SSDM 2007   ( H-I-3 )   176 - 177   2007年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Humidity Sensing Using Surface Plasmon Excitation in Fluorescent Microsphere Films 査読

    Yutaka Kobayashi, Makoto Fukushima, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    Transactions of the Materials Research Society of Japan   32 ( 2 )   317 - 320   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Surface plasmon emission light from Ag/MgF2/organic dye/MgF2/Ag films 査読

    Keizo Kato, Masaki Imaia, Yasuo Ohdaira, Kazunari Shinbo, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   472   441 - 449   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The attenuated total reflection (ATR) properties and emission light due to surface plasmon (SP) excitations have been investigated in the prism/Ag/MgF2/organic dye/MgF2/Ag structure. Poly(2-methoxy-5-(2 '-ethyl-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV) was used as the organic dye. SPs were excited at the interfaces of Ag/air, Ag/MgF2 and MgF2/Ag in this structure, and the resonant curve due to the SP excitations was observed by the ATR measurement. The emission light through the prism was observed using various light incidences by reverse and usual irradiations. When the incident light angle was fixed to an SP resonant angle as SPs were excited at two interfaces of Ag/MgF2 and MgF2/Ag, the strongest emission light was observed. The emission light spectra at various emission angles were measured and the emission light was related to photoluminescence of the organic dyes, and the intensity and the spectra strongly depended on the emission angles.

    DOI: 10.1080/15421400701544901

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  • Characteristics of magnesium phthalocyanine field-effect transistors due to vapor treatments 査読

    Toshiyuki Akazawa, Yasuhito Takatsuka, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   471   213 - 219   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Top-contact organic field-effect transistors (OFETs) were fabricated using vacuum evaporated magnesium phthalocyanine (MgPc) thin films with and without ethanol vapor treatments and OFET characteristics were investigated. The UV-vis absorption spectra, surface morphologies and x-ray diffraction patterns of the MgPc films were largely changed and the on/off ratio and field-effect mobilities of the OFETs were improved due to the vapor treatment. Hexamethyldisilazane (HMDS) vapor treatment of n-Si substrate surface also induced improvements of the OFET performance.

    DOI: 10.1080/15421400701548266

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  • Surface Plasmon Emission Light Properties in MIM Structures with Inserted Organic Dye Layer

    Keizo Kato, Masaki Imai, Yasuo Ohdaira, Kazunari Shinbo, Futao Kaneko

    7th International Conference on Nano-Molecular Electronics   ( PSI-61 )   224 - 225   2006年12月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Preparation and evaluation of aligned naphthacene thin films using surface plasmon excitation 査読

    Tohru Shimaoka, Hiroaki Kobayashi, Kazuki Yamashita, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE TRANSACTIONS ON ELECTRONICS   E89C ( 12 )   1758 - 1759   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Molecular aligned naphthacene thins films were fabricated using vacuum evaporation and the rubbing method. The attenuated total reflection (ATR) and emission light properties from surface plasmon (SP) excitation due to molecular luminescence were investigated for these films. The long axis of the rod-like molecule was estimated to align perpendicular to the rubbing direction. The ATR and emission light properties depended on the molecular orientation.

    DOI: 10.1093/ietele/e89-c.12.1758

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  • Electrical properties of organic field-effect transistor with Lewis-acid thin film between organic and insulator layers 査読

    Masahiro Minagawa, Kazunari Shinbo, Kohei Usuda, Toshiaki Takahashi, Masahide Iwasaki, Keizo Kato, Futao Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   45 ( 11 )   8890 - 8893   2006年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Organic field-effect transistors (OFETs) with Lewis-acid films were fabricated using copper phthalocyanine (CuPc), and the operating mechanism was studied. These OfETs have active layers of CuPc and vanadium pentoxide (V2O5) as a Lewis-acid film. A large drain current was observed in OFET's with a V2O5 layer for a positive gate voltage, and the mobility of these OFETs was improved compared with OFETs with only CuPc as an active layer. To investigate the operating mechanism, Xray diffraction patterns, UV-vis absorption spectra, and ionization potentials were measured in V2O5 films and CuPc films with and without a co-evaporation Of V2O5. Each characteristic of the CuPc layer changed owing to the introduction Of V2O5 It was considered that a CT complex is formed in the CuPc layer owing to the interaction between CuPc and V2O5 molecules, and contributes to the large drain current and improvement in mobility.

    DOI: 10.1143/JJAP.45.8890

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  • Attenuated Total Reflection and Surface Plasmon Emission Light Properties in Polyvinyl Alcohol Films with Polystyrene Microspheres

    Makoto Fukushima, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF 2006   ( P-94 )   130   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitations and Emission Light in MIM Structures with and without Organic Dye Layer

    Keizo Kato, Masaki Imai, Yasuo Ohdaira, Kazunari Shinbo, Futao Kaneko

    6th International Discussion & Conference on Nano Interface Controlled Electronic Devices   ( IS-9 )   32 - 33   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Hybrid Gas Sensor Using Quartz Crystal Microbalance and Optical Waveguide

    Yuichi Kanbayashi, Kazunari Shinbo, Yasuo Ohdaira, Futao Kaneko, Keizo Kato, Nobuo Miyadera

    KJF 2006   ( P-174 )   210   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Emission Light from Ag/MgF2/Organic Dye/MgF2/Ag Films

    Masaki Imai, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF 2006   ( P-95 )   131   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication of Nano-Fibers of Polyaniline Using Electrospinning Method

    Yoshinori Mizuno, Futao Kaneko, Kazunari Shinbo, Yasuo Ohdaira, Keizo Kato, Cheon Lee

    KJF 2006   ( P-127 )   163   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of Optically Excited Azo Dye Molecular Thin Films Utilizing Evanescent Wave Interferometer

    Yasuo Ohdaira, Kazumasa Banba, Osami Sasaki, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    KJF 2006   ( P-77 )   113   2006年10月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitations due to Evanescent Waves of Molecular Luminescence in Kretschmann Configuration

    Futao Kaneko, Tohru Shimaoka, Hiroaki Kobayashi, Kazuki Yamashita, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato

    NFO 2006   ( Mo-6-3 )   20   2006年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Migration of Azo Dye Molecules due to Local Polarization in Optical Near-fields

    Yasuo Ohdaira, Masahiko Sugaya, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Hirokazu Hori

    NFO 2006   ( TyP-72 )   208   2006年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication and Ethanol Vapor Treatment of Magnesium Phthalocyanine Field Effect Transistor 査読

    Kazunari Shinbo, Toshiyuki Akazawa, Hiroshi Ikarashi, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    SSDM 2006   ( P-10-16 )   772 - 773   2006年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Gas Sensing Properties of Gold Nano-Particle Thin Films on Quartz Crystal Microbalance

    Kazunari Shinbo, Hiroyuki Furukawa, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    ECOF 2006   ( Po-26 )   68   2006年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Emission Light Properties in MIM Structures with and without Inserted Organic Dye Layers

    Keizo Kato, Masaki Imai, Yasuo Ohdaira, Kazunari Shinbo, Futao Kaneko

    ECOF 2006   ( Or-12 )   78   2006年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Surface Plasmon Excitations due to Evanescent Waves of Molecular Luminescence and Emission Light from Plasmons

    Futao Kaneko, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato

    PIERS 2006   ( 3A4 )   292   2006年8月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Nano-fabrication of surface relief gratings on azo dye films utilizing interference of evanescent waves on prism 査読

    Yasuo Ohdaira, Ken Noguchi, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   284   556 - 560   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Nano-patterns were investigated on azo dye thin films exposed by an interference of evanescent waves propagating on a prism surface. The patterns strongly depended upon polarization of the incident laser beams forming electric field vectors of the evanescent waves in the vicinity of the prism surface. Line structures of surface relief gratings (SRGs) were clearly inscribed by selecting s-polarization of the incident light. The cyclic pattern of the lines was approximately 210 nm that was smaller than a half of the wavelength of the incident laser at 488 nm. Any line patterns were not obtained using p-polarization of the light, but nano-dot patterns were fabricated on azo dye films. This technique based on molecular migration due to evanescent waves is thought to be very useful for nano-device processing and future device applications. (c) 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.colsurfa.2006.02.054

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  • Adsorption of Dye-doped Polystyrene Spheres and Surface Plasmon Emission Light Properties

    Kazunari Shinbo, Hiroshi Miura, Satoshi Takahashi, Yasuo Ohdaira, Keizo Kato, Futao Kaneko

    4th International Symposium on Organic Molecular Electronics   ( EM6 )   49   2006年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Fabrication of Micro-fibers of Polyvinylcarbazol Using Electrospinning Method

    Yoshinori Mizuno, Yukitaka Takahashi, Futao Kaneko, Kazunari Shinbo, Yasuo Ohdaira, Keizo Kato

    7th International Symposium on Functional p–electron Systems   ( PS-A73 )   159   2006年5月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Evaluation of nanostructure and properties of aluminum phthalocyanine chloride thin films due to ethanol-vapor treatment 査読

    K Kato, Y Saito, Y Ohdaira, K Shinbo, F Kaneko

    THIN SOLID FILMS   499 ( 1-2 )   174 - 178   2006年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Aluminum phthalocyanine chloride (AlClPc) thin films were evaporated and the properties of the AlClPc thin films treated with ethanol vapor were investigated using attenuated total reflection (ATR) and emission light measurements due to surface plasmon (SP) excitations. The optical absorption spectra and surface morphology remarkably changed due to the ethanol-vapor treatment. From the ATR measurement, it was found that the thickness evaluated from the theoretical calculations increases with the treatment of ethanol vapor. The emission lights due to SP were also observed for the samples. The emission light intensity increase with the surface roughness for the incident light with wavelength of 488.0 nm. The current vs. voltage characteristics of the AlClPc thin films before and after the ethanol-vapor treatment were also investigated and it was found that the conduction current was increased by the ethanol-vapor treatment. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tsf.2005.07.022

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  • Organic field-effect transistor with V2O5 thin film between organic and insulator 査読

    M Minagawa, K Shinbo, K Usuda, M Iwasaki, K Kato, F Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS   45 ( 1-3 )   L99 - L101   2006年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Top-contact organic field-effect transistors (OFETs) with Lewis-acid films were fabricated using copper phthalocyanine, (CuPc), and the effects of inserted Lewis-acid thin films on electrical properties were investigated. The OFETs have active layers of CuPc and vanadium pentoxide (V2O5) as a Lewis-acid film. Larger drain currents were observed for the OFET with the V2O5 layer than that without the layer. The calculated field-effect mobility of the fabricated OFET was 3.6 x 10(-3) cm(2)/(Vs), where as that of the OFET without the V2O5 layer was 2.5 x 10(-4) cm(2)/(Vs). It was thought that holes and electrons were generated in V2O5 film by gate voltage and the holes were injected into the CuPc layer. The injected holes in the CuPc layer and electrons in the V2O5 layer can contribute to drain current and the apparent high mobility.

    DOI: 10.1143/JJAP.45.L99

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  • Preparation and evaluation of aligned naphthacene thin films using surface plasmon excitation

    Tohru Shimaoka, Hiroaki Kobayashi, Kazuki Yamashita, Yasuo Ohdaira, Kazunari Shinbo, Keizo Kato, Futao Kaneko

    IEICE Transactions on Electronics   E89-C ( 12 )   1758 - 1759   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Electronics, Information and Communication, Engineers, IEICE  

    Molecular aligned naphthacene thins films were fabricated using vacuum evaporation and the rubbing method. The attenuated total reflection (ATR) and emission light properties from surface plasmon (SP) excitation due to molecular luminescence were investigated for these films. The long axis of the rod-like molecule was estimated to align perpendicular to the rubbing direction. The ATR and emission light properties depended on the molecular orientation. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers.

    DOI: 10.1093/ietele/e89-c.12.1758

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  • Special section on towards the realization of organic molecular electronics 査読

    Teruaki Katsube, Mitsuyoshi Onoda, Yuki Hasegawa, Hiroyuki Fujii, Eiji Itoh, Hirotake Kajii, Tohru Kubota, Kazuhiro Kudo, Yutaka Majima, Yoko Matsuzawa, Satoshi Mikoshiba, Hitoshi Muguruma, Shuichi Nagamatsu, Kazuhiro Saito, Kazunari Shinbo, Takao Someya, Okihiro Sugihara

    IEICE Transactions on Electronics   E89-C ( 12 )   1725 - 1726   2006年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electronics, Information and Communication, Engineers, IEICE  

    DOI: 10.1093/ietele/e89-c.12.1725

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  • Attenuated total reflection and surface plasmon emission light properties of molecular aligned naphthacene thin films 査読

    Keizo Kato, Tohru Shimaoka, Kazuki Yamashita, Yasuo Ohdaira, Kazunari Shinbo, Futao Kaneko

    IEEE NMDC 2006: IEEE NANOTECHNOLOGY MATERIALS AND DEVICES CONFERENCE 2006, PROCEEDINGS   ( MEP34 )   592 - +   2006年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Molecular aligned naphthacene thin films were prepared using rubbing method. The attenuated total reflection (ATR) and surface plasmon (SP) emission light properties were investigated. The long axis of the naphthacene molecule was found to be aligned perpendicular to the rubbing direction. The ATR and SP emission light properties depended on the molecular orientation.

    DOI: 10.1109/NMDC.2006.4388918

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  • Luminescence and photoelectric properties of thiophene dendrimer spin-coated films 査読

    K Shinbo, Y Ikeda, CJ Xia, K Kato, F Kaneko, RC Advincula

    CURRENT APPLIED PHYSICS   5 ( 4 )   314 - 316   2005年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Thiophene dendrimer spin-coated films were fabricated and the optical and photoelectric properties were investigated. Absorption edge and peak of photoluminescence (PL) spectra for the film were observed at around 550 and 618 nm, respectively. The excitation spectrum almost corresponded with optical absorption. From the voltage vs. current properties, the Schottky conductions were estimated in the indium tin oxide (ITO)/dendrimer/Al device. Photoelectric properties were also observed and the action spectra of the photocurrent in the device also corresponded with the absorption spectrum. (c) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cap.2004.01.045

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  • Organic light emitting diodes with nanostructured ultrathin layers at the interface between electron- and hole-transport layers 査読

    K Kato, K Takahashi, K Suzuki, T Sato, K Shinbo, F Kaneko, H Shimizu, N Tsuboi, T Tadokoro, S Ohta

    CURRENT APPLIED PHYSICS   5 ( 4 )   321 - 326   2005年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Organic light emitting diodes (OLEDs) with nanostructured ultrathin layers inserted at the interface between electron- and hole-transport layers were investigated. The fundamental structure of the OLEDs fabricated by a vacuum evaporation method was indium-tin-oxide (ITO) anode/copper phthalocyanine (CuPc)/N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD)/8-hydroxyquinoline aluminum (Alq(3))/LiF/Al cathode. Fullerene (C-60) and rhodamine B (RhB) molecules were used as the nanosutructured ultrathin layers inserted at the interface between the Alq(3) and TPD layers. The electroluminescent (EL) properties have been measured for the OLEDs with C-60 and RhB ultrathin layers and the dependences on the thickness and the position of the inserted layers were examined. For the OLEDs with the C-60 ultrathin layer, the improvements of the drive voltage and EL efficiency were observed. The OLED with the inserted C-60 ultrathin film of a monolayer thickness showed the highest efficiency, which was twice as large as that without C-60 layer. On the contrary, the improvements were not observed for the OLEDs with the RhB ultrathin layer. (c) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cap.2004.01.047

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  • Fabrication of surface relief gratings on azo dye thin films utilizing an interference of evanescent waves 査読

    Y Ohdaira, S Hoshiyama, T Kawakami, K Shinbo, K Kato, F Kaneko

    APPLIED PHYSICS LETTERS   86 ( 5 )   051102,1 - 051102,3   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Fabrication of surface relief gratings (SRGs) on azo dye thin films has been investigated utilizing an interference of evanescent waves. SRGs of approximately 210 nm were inscribed on the photoisomerized azo dye films, that were smaller than a half wavelength of an incidence laser of 488.0 nm. The films were set on a right-angled triangular prism surface and were in the interference of evanescent waves of totally reflected laser beams at the prism surface. The interference at the surface was performed using a laser beam through the one side of the isosceles and the returned beam at the other side of the isosceles where a mirror was set. The SRG patterns of azo dye films due to trans-cis transition of the dyes were observed in situ using an atomic force microscope above the prism surface. (C) 2005 American Institute of Physics.

    DOI: 10.1063/1.1857070

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  • Surface plasmon emission light property due to molecular luminescence and molecular interaction 査読

    K Shinbo, S Toyoshima, Y Ohdaira, K Kato, F Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   44 ( 1B )   599 - 603   2005年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC APPLIED PHYSICS  

    Surface plasmon (SP) emission light was observed for a merocyanine (MC) Langmuir-Blodgett (LB) film and an MC/crystal violet (CV) hetero-LB film in the ATR Kretschmann configuration. Intense photoluminescence of CV and quenching of MC were observed due to an energy transfer from MC to CV in the hetero-LB film. SP emission light due to CV was also observed for the MC/CV hetero-LB film. Furthermore, the emission light properties of the MC/CV hetero-LB film did not depend on the polarization direction of excitation light and were considered to be a result of the molecular shape of CV.

    DOI: 10.1143/JJAP.44.599

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  • Preparation and NO2 gas properties of layer-by-layer alternate films of copper phthalocyanine derivatives 査読

    K Shinbo, N Watanabe, K Kato, F Kaneko, RC Advincula

    Proceedings of the 2005 International Symposium on Electrical Insulating Materials, Vols, 1-3   218 - 221   2005年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INST ELECTR ENGINEERS JAPAN  

    Copper phthalocyanine (CuPc) alternate layer-by-layer (LbL) films were fabricated and the electrical properties due to NO2 gas adsorption were investigated. Water-soluble CuPc, that is, cationic Alcian blue, pyridine variant (AB) and anionic copper phthalocyanine-3,4',4",4"'-tetrasulfonic acid, tetrasodium salt (CuPcTs) were used for the fabrication of the alternate LbL films. UV-visible absorption and ellipsometry measurements were carried out and successive depositions of the CuPc alternate LbL films were confirmed. The average thicknesses of the AB and CuPcTs monolayers were estimated to be about 0.7 and 0.4 nm, respectively. The fundamental electrical properties were investigated for the CuPc alternate LbL films with Au gap electrodes and the properties in the direction parallel to the surfaces of the LbL films were investigated. The response to NO2 gas was also measured and the large increase of conduction currents due to NO2 gas adsorption was observed. The magnitude of the conduction current after 30 min exposure to 100. ppm NO2 gas was 10(3)-10(4) times larger than that in N-2 gas. Fast response was observed for the thin LbL films.

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  • Surface plasmon excitations and emission light due to molecular luminescence on metal thin film 査読

    F Kaneko, S Toyoshima, Y Ohdaira, K Shinbo, K Kato

    Organic and Nanocomposite Optical Materials   846   99 - 104   2005年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MATERIALS RESEARCH SOCIETY  

    Emission light due to surface plasmon (SP) excitations has been investigated in Kretschmann configuration of prism/metal thin film/organic dye thin films by means of direct irradiation of a laser beam from air to the films. Emission light through the prism coincided with the resonant conditions of SP excitations in the configuration. It was thought that SPs on the metal surface were excited by luminescence of dye molecules close to the metal surface, and the SPs propagating along the metal surface were converted to the emission light according to the resonant conditions of SPs in the configuration. Intensities and spectra of the SP emission light through the prism strongly depended upon emission angles, nanostructures of dye films, the film thickness and mixture of two kinds of dyes.

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  • Nano-inscription of surface relief gratings of azo dye molecular films utilizing interference of evanescent waves on prism surface 査読

    F Kaneko, Y Ohdaira, K Noguchi, S Hoshiyama, H Maki, K Shinbo, K Kato

    Proceedings of the 2005 International Symposium on Electrical Insulating Materials, Vols, 1-3   251 - 254   2005年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INST ELECTR ENGINEERS JAPAN  

    A novel method was performed for optical fabrication of nano-structures on organic photosensitive thin films utilizing evanescent waves on prism surface. The evanescent waves are produced by means of total internal reflection of laser beams on a prism surface and the intensity shows exponential decay from the surface. Nano-patterns of surface relief gratings (SRGs) were inscribed for spin-coated azo dye (congo red) films showing photoisomerization by the evanescent waves. The cycle pattern of the SRG was approximately 210nm that was smaller than a half of the incident laser wavelength of 488 run. In the conventional technique of fabrication of SRGs, it is very difficult to obtain narrower lattices and one can not obtain any smaller lattices of SRGs than a half wavelength of the laser beam. This techniques based on molecular migration due to evanescent waves are thought to be very useful for nano-device processing and future device applications.

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  • Multiple Surface Plasmon Excitations and Emission Light due to Reverse Irradiation in Kretschmann Configuration with Nanostructured Dye LB Films 査読

    S.Toyoshima, F.Kaneko, T.Sato, K.Shinbo, K.Kato, Y.Ohdaira, T.Waklamatsu

    Trans. Mat. Res. Soc. Jpn.   29, 3   755 - 758   2004年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Photoelectric Cells of Organic Dye Thin Films Utilizing Surface Plasmon Excitations 査読

    K.Kato, M.Hirano, F.Takahashi, K.Shinbo, F.Kaneko, T.Wakamatsu

    Trans. Mat. Res. Soc. Jpn   29, 3   775 - 778   2004年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Electrical properties and gas response in alternate layer-by-layer films of copper phthalocyanine dyes 査読

    K Kato, N Watanabe, S Katagiri, K Shinbo, F Kaneko, J Locklin, A Baba, RC Advincula

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   43 ( 4B )   2311 - 2314   2004年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Alternate layer-by-layer (LbL) films were fabricated using two kinds of copper phthalocyanine (CuPc) dyes and the electrical properties due to NO2 gas adsorption were investigated. Water-soluble CuPc dyes, that is, cationic Alcian blue, pyridine variant (AB) and anionic copper phthalocyanine-3,4',4",4'"-tetrasulfonic acid, tetrasodium salt (CuPcTs) were used for the alternate LbL films. Successive depositions of the CuPc alternate LbL films were confirmed using UV-visible absorption and ellipsometry measurements. The average thicknesses of the AB and CuPcTs monolayers were estimated to be 0.7 nm and 0.4 nm, respectively. The fundamental electrical properties were examined for the CuPc alternate LbL films with Au gap electrodes and the properties in the direction parallel to the surfaces of the LbL films were measured. The conduction currents were considered to be dominated by hopping conduction. The response to NO, gas was also measured and the large increase in conduction Currents due to NO, gas adsorption was observed. The magnitude of the conduction current after 30 min exposure to 100 ppm NO2 gas was 10(3)-10(4) times larger than that in N-2 gas.

    DOI: 10.1143/JJAP.43.2311

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  • Conversion between three- and two-dimensional optical waves in attenuated total reflection Kretschmann configuration with nanostructured Langmuir-Blodgett films 査読

    F Kaneko, K Wakui, H Hatakeyama, S Toyoshima, K Shinbo, K Kato, T Kawakami, Y Ohdaira, T Wakamatsu

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   43 ( 4B )   2335 - 2340   2004年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Surface plasmon (SP) emission light has been investigated for rhodamine-B (RB) dye Langmuir-Blodgett (LB) films on silver (Ag) thin film in the attenuated total reflection (ATR) Kretschmann configuration by means of reverse irradiation of a laser beam. Emission light through the prism was clearly observed for the configuration of prism/Ag/LB films corresponding to the resonant excitation conditions for SPs using the reverse irradiation. The intensities of the SP emission light increased with the thickness of the RB LB films. but nonlinear reductions of the SP emission light and photoluminescence (PL) were observed due to nonradiative energy transfer at the very small separations between the RB and Ag films. It is thought that the SPs, that is. two-dimensional optical waves, are excited by PL of the RB dyes on the Ag film and that this phenomenon is very useful for applications utilizing dye molecules on metal thin films.

    DOI: 10.1143/JJAP.43.2335

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  • ナノ構造制御ローダミンBLB膜のホトルミネッセンスとクレッチマン配置での表面プラズモン放射光 査読

    和久井 克明, 畠山 弘次, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, 川上 貴浩, 若松 孝

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   124 ( 3 )   293 - 298   2004年

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 電気学会  

    Photoluminescence and surface plasmon emission light have been investigated in the attenuated total reflection (ATR) Kretschmann configuration. Surface plasmons (SPs), two-dimensional optical waves, were excited when rhodamine-B (RB) dye Langmuir-Blodgett (LB) films on metal thin film were directly irradiated by laser beams in the Kretschmann configuration. Emission light, that is, three-dimensional optical waves through the prism were observed corresponding to the resonant conditions of SP excitations in the configuration. The intensity of the SP emission light was small for the RB LB film with 4 layers, but the intensities increased in proportion to the thickness for the LB films having above 8 layers. Photoluminescence intensities also strongly depended upon the nanostructured separation between the RB LB films and metal thin films. It is thought that the phenomena are very useful for applications utilizing dye molecules on metal and conversion between three- and two-dimensional optical waves.

    DOI: 10.1541/ieejfms.124.293

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  • Enhancement of photoelectric effect in organic dye thin film cells by surface plasmon excitation 査読

    K Kato, M Hirano, K Shinbo, F Kaneko, T Wakamatsu

    CRITICAL INTERFACIAL ISSUES IN THIN-FILM OPTOELECTRONIC AND ENERGY CONVERSION DEVICES   796   3 - 8   2004年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MATERIALS RESEARCH SOCIETY  

    Photoelectric properties have been investigated for the organic dye thin film cells utilizing surface plasmon (SP) excitation. The cells fabricated in this work had a prism/Al thin film/copper phtalocyanine (CuPc) thin film/Ag thin film structure, which was the Kretschmann configuration in the attenuated total reflection (ATR) method. Since the CuPc thin film exhibits p-type conduction, the Schottky and Ohmic contacts can be obtained at the interfaces between the CuPc and Al thin films and between the CuPc and Ag thin films, respectively, and the cells used in this work show photoelectric properties. The ATR and short-circuit photocurrent properties have been simultaneously measured as a function of the incident angles of the laser beams. The experimental and calculated results of the ATR and short-circuit photocurrent properties and the optical absorptions of the organic dye layers were discussed. It was found that the photoelectric effect in the organic dye thin film cells the Kretschmann configuration in the ATR method was enhanced by the SP excitation.

    DOI: 10.1557/PROC-796-V5.8

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  • Evaluation of Structure and Emission Property of Alternate Self-Assembled Ultrathin Films Containing Azo-Dye by Surface Plasmon Excitation Method 査読

    K.Kato, J.Kawashima, K.Shinbo, F.Kaneko, A.Baba, R.C.Advincula

    Trans. Mat. Res. Soc. Jpn.   28, 1   43 - 46   2003年12月

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  • Fabrication and Electrochemical Properties of Water-soluble Phtalocyanine Layer-by-layer Deposited Films 査読

    K.Shinbo, K.Onishi, S.Miyabayashi, K.Kato, F.Kaneko, R.C.Advincula

    Trans. Mat. Res. Soc. Jpn.   28, 1   63 - 66   2003年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Excitations of Multiple Surface Plasmons and Emission Light in Nanostructured LB Films 査読

    F.Kaneko, T.Sato, M.Terakado, K.Shinbo, K.Kato, T.Wakamatsu

    Trans. Mat. Res. Soc. Jpn.   28, 1   39 - 42   2003年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Conversion between Three and Two Dimensional Optical Waves utilizing Surface Plasmon Excitations in Attenuated Total Reflection Kretschmann Configuration 査読

    Futao Kaneko, Takuya Nakano, Toshiharu Sato, Wataru Saito, Kazunari Shinbo, Keizo Kato, Takashi Wakamatsu

    Transactions of Materials Research Society of Japan   28 ( 4 )   1027 - 1030   2003年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Attenuated total reflection and emission due to surface plasmon excitation of layer-by-layer ultrathin films containing azo-dye 査読

    K Kato, J Kawashima, A Baba, K Shinbo, F Kaneko, RC Advincula

    THIN SOLID FILMS   438   101 - 107   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The properties of attenuated total reflection (ATR) and emission due to surface plasmon (SP) excitation were investigated for the alternate layer-by-layer ultrathin films self-assembled on Ag thin films using polycation (poly(diallyldimethylammonium chloride), PDADMAC) and azo-dye (Direct Red 80, DR80). The emission light had peaks at the same angles as the resonant angles of the ATR curves and the shapes of the emission spectra also corresponded to those of the ATR curves, and the emission was considered to be mainly due to the SP excitation mediated by the surface roughness of Ag thin films. The structure of the PDADMAC/DR80 layer-by-layer films was found to change due to the photoisomerization of DR80 molecules by the irradiation of polarized visible light, and the surface roughness of the layer-by-layer films was also found to increase by the irradiation and hardly to change after 5-min irradiation. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0040-6090(03)00780-6

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  • Fabrication and electrochemical properties of layer-by-layer deposited films containing phthalocyanine dyes 査読

    K Shinbo, K Onishi, S Miyabayashi, K Takahashi, K Takahashi, K Kato, F Kaneko, RC Advincula

    THIN SOLID FILMS   438   177 - 181   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Ultrathin films containing water-soluble copper (11) phthalocyanine-3,4',4",4'''- tetrasulfonic acid (CuPcTs) and poly(diallyldimethylammonium chloride) (PDADMAC) were fabricated using the electrostatic layer-by-layer deposition technique. UV-vis absorption spectra and ellipsometry measurements suggested successive linear depositions of the bilayers of CuPcTs and PDADMAC. The thickness of the CuPcTs monolayer obtained from the ellipsometry was smaller than the plain size of CuPcTs and the molecule planes were considered and tilted in the film. The surface morphology was also observed using atomic force microscopy. The cyclic votammogram (C-V) of the fabricated films in 0.1 M KCl aqueous solution suggested the oxidation and reduction of the CuPcTs at approximately +0.9 and +0.05 V vs. Ag/AgCl, respectively. UV-vis absorption spectra were observed for the films at applied voltages of +0.9 and 0.0 V in the KCl aqueous solution and electrochromisms were repeatedly observed. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0040-6090(03)00730-2

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  • Molecular thin film structure and multiple surface plasmon excitations at nano-interfaces in the attenuated total reflection Kretschmann configuration 査読

    F Kaneko, W Saito, T Sato, H Hatakeyama, K Shinbo, K Kato, T Wakamatsu

    THIN SOLID FILMS   438   108 - 113   2003年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Relationships between molecular thin film structure and multiple surface plasmon (SP) excitations at nano-interfaces have been investigated for prism/metal thin film/molecular thin films in the attenuated total reflection Kretschmann configuration. Recently, emission light through the prism that strongly depended upon the emission angles was observed using the reverse irradiation, that is, direct irradiation of a laser beam from air to molecular thin films. Emission light in the reverse irradiation has investigated in detail for organic thin films with various structures. From the dispersion property of the emission spectra at various emission angles, it was estimated that the emission light was caused by excitation of multiple SPs at the nano-interfaces. The emission properties also depended upon the amount of dye molecules, nano-spacing between the metal and dyes, and polarizations of the laser beam. It is thought that the phenomenon is useful for application to new devices utilizing multiple SP excitations. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0040-6090(03)00783-1

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  • Emission light and multiple surface plasmon excitations at prism/Ag/merocyanine Langmuir-Blodgett films 査読

    F Kaneko, T Sato, M Terakado, T Nakano, K Shinbo, K Kato, N Tsuboi, T Wakamatsu, RC Advincula

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   42 ( 4B )   2511 - 2515   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Emission light through a prism has been investigated for prism/silver (Ag) thin film/merocyanine (MC) Langmuir-Blodgett (LB) films in the Kretschmann configuration. Emission light was observed by means of direct irradiation of a laser beam from air to the MC LB films, that is, reverse irradiation. The emission properties coincided with resonant conditions of surface plasmon (SP) excitations in the Kretschmann configuration. Emission due to SP excitations depended upon the position of the MC LB film in the LB hetero films of arachidic acid (C20)MC/C20 on the Ag thin film. The strongest emission was observed at some separation of the MC LB layer from the metal surface. Emission properties were also investigated for the hetero LB films of MC and C20 on aluminum (Al) thin film and for the MC LB films with various thicknesses. It is thought that the phenomenon is useful for application to new devices utilizing multiple SP excitations.

    DOI: 10.1143/JJAP.42.2511

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  • Organic light-emitting diodes with a nanostructured fulterene layer at the interface between Alq(3) and TPD layers 査読

    K Kato, K Suzuki, K Shinbo, F Kaneko, N Tsuboi, S Kobayashi, T Tadokoro, S Ohta

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   42 ( 4B )   2526 - 2529   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Organic light-emitting diodes (OLEDs) with a nanostructured fullerene (C-60) layer at and near the interface between the electron- and hole-transport layers were fabricated using a vacuum evaporation method. The OLEDs had a fundamental structure of indium-tin-oxide (ITO) anode/copper phtalocyanine (CuPc)/N,N'-dephenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD)/8-hydroxyquinoline aluminum (Alq(3))/LiF/Al cathode. The electroluminescent (EL) properties have been investigated for the OLEDs with a nanostructured C-60 layer at the TPD/Alq(3) interface and at the different positions in the Alq(3) layer near the TPD/Alq(3) interface. The dependences of the EL properties on the thickness of the inserted C-60 layer and on the position from the interface were examined. The OLEDs with a C-60 monolayer inserted at the TPD/Alq(3) interface showed the highest efficiency.

    DOI: 10.1143/JJAP.42.2526

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  • Organic light-emitting diodes with a nanostructured fulterene layer at the interface between Alq(3) and TPD layers 査読

    K Kato, K Suzuki, K Shinbo, F Kaneko, N Tsuboi, S Kobayashi, T Tadokoro, S Ohta

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   42 ( 4B )   2526 - 2529   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Organic light-emitting diodes (OLEDs) with a nanostructured fullerene (C-60) layer at and near the interface between the electron- and hole-transport layers were fabricated using a vacuum evaporation method. The OLEDs had a fundamental structure of indium-tin-oxide (ITO) anode/copper phtalocyanine (CuPc)/N,N'-dephenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD)/8-hydroxyquinoline aluminum (Alq(3))/LiF/Al cathode. The electroluminescent (EL) properties have been investigated for the OLEDs with a nanostructured C-60 layer at the TPD/Alq(3) interface and at the different positions in the Alq(3) layer near the TPD/Alq(3) interface. The dependences of the EL properties on the thickness of the inserted C-60 layer and on the position from the interface were examined. The OLEDs with a C-60 monolayer inserted at the TPD/Alq(3) interface showed the highest efficiency.

    DOI: 10.1143/JJAP.42.2526

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  • Fabrication and surface plasmon excitation properties of polystyrene submicron and micron sphere thin films 査読

    K Shinbo, S Miyabayashi, H Kobayashi, H Shimizu, K Kato, F Kaneko, T Kawakami, M Tanaka, T Wakamatsu, RC Advincula

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   42 ( 4B )   2506 - 2510   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Polystyrene submicron and micron sphere films were fabricated and the optical properties were investigated using surface plasmon spectroscopy (SPS) and reverse irradiation utilizing the SPS Kretschmann configuration. The diameters of the spheres were 0.1 and 1.0 mum. For the 0.1-mum-sphere films, the dip angles of the SPS curves shifted to higher angles with the amount of spheres in the films. However, for the 1.0-mum-sphere films, the SPS curves did not shift with the amount of spheres which is considered to be due to the change of the effective dielectric constant in the decay length of the evanescent field intensity of surface plasmon. Furthermore, emitted light due to reverse irradiation was also observed as a function of the emitted angle in the Kretschmann configuration. The peak angles of the emitted light almost corresponded to the dip angles of the SPS curves and the emitted light was considered to be due to surface plasmon excitation.

    DOI: 10.1143/JJAP.42.2506

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  • Ambipolar organic thin film transistor-like behavior of cationic and anionic phthalocyanines fabricated using layer-by-layer deposition from aqueous solution 査読

    J Locklin, K Shinbo, K Onishi, F Kaneko, ZN Bao, RC Advincula

    CHEMISTRY OF MATERIALS   15 ( 7 )   1404 - 1412   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    Organic thin film field effect transistors of water-soluble cationic and anionic phthalocyanine derivatives were successfully prepared using the layer-by-layer deposition technique. The alternating film growth and subsequent transistor properties were studied with a variety of techniques including ellipsometry, UV-vis spectroscopy, polarized UV-vis spectroscopy, AFM, and field effect transistor measurements. A stepwise and regular deposition of copper(II) phthalocyanine tetrakis(methyl pyridinium) chloride and copper(II) phthalocyanine tetrasulfonic acid, tetrasodium salt multilayers in both pure water and 0.03 M NaCl solution was observed. Differences in linear growth were observed between pure water and 0.03 M NaCl-based solutions. Polarized UV-vis spectra indicated that the conjugated phthalocyanine ring lies almost flat on the substrate surface with a random orientation within the plane of the substrate. Unusual "ambipolar" transistor-like behavior was found for the films that can be attributed to an ion-modulated electrical conduction mechanism, which relies on the assistance of mobile ions to stabilize the oxidized or reduced species in the channel region.

    DOI: 10.1021/cm021073f

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  • Fabrication and surface plasmon excitation properties of polystyrene submicron and micron sphere thin films 査読

    K Shinbo, S Miyabayashi, H Kobayashi, H Shimizu, K Kato, F Kaneko, T Kawakami, M Tanaka, T Wakamatsu, RC Advincula

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   42 ( 4B )   2506 - 2510   2003年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Polystyrene submicron and micron sphere films were fabricated and the optical properties were investigated using surface plasmon spectroscopy (SPS) and reverse irradiation utilizing the SPS Kretschmann configuration. The diameters of the spheres were 0.1 and 1.0 mum. For the 0.1-mum-sphere films, the dip angles of the SPS curves shifted to higher angles with the amount of spheres in the films. However, for the 1.0-mum-sphere films, the SPS curves did not shift with the amount of spheres which is considered to be due to the change of the effective dielectric constant in the decay length of the evanescent field intensity of surface plasmon. Furthermore, emitted light due to reverse irradiation was also observed as a function of the emitted angle in the Kretschmann configuration. The peak angles of the emitted light almost corresponded to the dip angles of the SPS curves and the emitted light was considered to be due to surface plasmon excitation.

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  • A scheduling method for painting line under Pull production 査読

    JK Yoo, K Shinbo, Y Shimizu

    JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING   46 ( 1 )   88 - 92   2003年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    This paper concerns with a scheduling method for painting (preceding) line with much longer production lead-time than assembly (subsequent) line. In general, production schedule of the painting line is made independently based on the forecasted job requirement at the assembly line. When the job requirement changes at the assembly line by virtue of the change of customer order, therefore, production balance is destroyed between the both lines. To avoid the tardiness caused by such unbalance, we need to have many inventories for the painting line. Such countermeasure is taken place in many companies actually. Thus, to avoid the tardiness while keeping small inventory, we propose a scheduling method that makes a Pseudo-Pull production possible for the painting line. We have evaluated the proposed method through computer simulations.

    DOI: 10.1299/jsmec.46.88

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  • Photoelectric cells of copper phtalocyanine thin films utilizing surface plasmon excitation 査読

    K Kato, F Takahashi, K Shinbo, F Kaneko, T Wakamatsu

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1-3   1092 - 1095   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Short-circuit photocurrent (I-SC) due to surface plasmon (SP) excitation has been investigated for the photoelectric cells using copper phtalocyanine (CuPc). The CuPc molecule exhibits p-type conduction, and the Schottky and Ohmic contacts are obtained at the interfaces between CuPc and Al thin films and between CuPc and Ag thin films, respectively. Since the Schottky diodes show the photoelectric effects, the Schottky photoelectric cells have been constructed. The cells had a prism/Al/CuPc/Ag structure of the Kretschmann configuration in the attenuated total reflection (ATR) method. SP has been resonantly excited at the interface between Ag and air. The ATR and the I-SC properties have been simultaneously measured as a function of the incident angles of the laser beams. The peaks of the I-SC have corresponded to the resonant angles of the ATR curves. The electric fields and optical absorptions in the cells have been also calculated using the complex dielectric constants and the film thicknesses obtained from the ATR measurements. The calculated absorptions in the CuPc thin film as a function of,the incident angles have corresponded to the results of I-SC. It has been estimated that the I-SC could be enhanced by the excitations of SP in the ATR configuration.

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  • Attenuated total reflection and emission properties of self-assembled layer-bylayer films containing azobenzene dye 査読

    K Kato, J Kawashima, K Shinbo, F Kaneko, K Kato, K Shinbo, F Kaneko, A Baba, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   407   501 - 509   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Self-assembled layer-by-layer films were fabricated on Ag-evaporated glass substrates using Direct Red 80 (DR80) azobenzene dye and poly (diallyldimethylammonium chloride) (PDADMAC), The properties of attenuated total reflection (ATR) and emission due to surface plasmon excitation were investigated. The ATR was measured for the Kretschmann configuration of a prism/Ag/layer-by-layer film structure and the emission through the prism was measured when the sample was excited by reverse irradiation in the Kretschmann configuration. The peak angles of the emission spectra almost agreed with the resonant angles of the ATR curves. The shapes of the emission spectra also corresponded to the ATR curves. ne structural change of the self-assembled films due to photoisomerization of DR80 molecules was also investigated. From the ATR measurements, the structure of the self-assembled films was found to change due to the photoisomerization by the irradiation of polarized visible light. The surface roughness of the self-assembled films due to the photoisomerization was examined from the scattered light measurements.

    DOI: 10.1080/744819019

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  • Fabrication and Electrochromic Properties of Layer-by-layer Self-assembled Ultrathin Films Containing Water-soluble Phthalocyanine 査読

    Kazunari Shinbo, Keizo Kato, Futao Kaneko, Ken Onishi, Rigoberto C. Advincula, Xiaowu Fan

    Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   407 ( 3 )   97 - 104   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    Alternate ultrathin films of water-soluble copper (II) phthalocyanine-3, 4′,4″,4‴-tetrasulfonic acid (CuPcTs) and poly(diallyldimethylammonium chloride) (PDADMAC) were fabricated using the electrostatic layer-by-layer self-assembly technique. Linear depositions of the bilayers were observed from the UV-vis absorption spectra and ellipsometry. The average thickness of the CuPcTs monolayer obtained from ellipsometry was about 1.2nm and CuPcTb molecules were estimated to be tilted to the film surface. The cyclic votammo-gram (C-V) of the fabricated films in aqueous solution containing 0.1 M KCl suggested the oxidation and reduction of the CuPcTb at around +0.9 V and 0.05 V respectively. UV-vis absorption spectra were observed for the films at applied voltages of 0.8 Vand 0 V in the KCl aqueous solution and reversible absorption changes were observed.

    DOI: 10.1080/15421400390264054

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  • Attenuated total reflection and emission properties of self-assembled layer-bylayer films containing azobenzene dye 査読

    K Kato, J Kawashima, K Shinbo, F Kaneko, K Kato, K Shinbo, F Kaneko, A Baba, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   407   501 - 509   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Self-assembled layer-by-layer films were fabricated on Ag-evaporated glass substrates using Direct Red 80 (DR80) azobenzene dye and poly (diallyldimethylammonium chloride) (PDADMAC), The properties of attenuated total reflection (ATR) and emission due to surface plasmon excitation were investigated. The ATR was measured for the Kretschmann configuration of a prism/Ag/layer-by-layer film structure and the emission through the prism was measured when the sample was excited by reverse irradiation in the Kretschmann configuration. The peak angles of the emission spectra almost agreed with the resonant angles of the ATR curves. The shapes of the emission spectra also corresponded to the ATR curves. ne structural change of the self-assembled films due to photoisomerization of DR80 molecules was also investigated. From the ATR measurements, the structure of the self-assembled films was found to change due to the photoisomerization by the irradiation of polarized visible light. The surface roughness of the self-assembled films due to the photoisomerization was examined from the scattered light measurements.

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  • Surface plasmon resonance and emitted light properties of polystyrene sphere films 査読

    K Shinbo, S Miyabayashi, K Yoshizawa, H Shimizu, K Kato, F Kaneko, M Tanaka, T Wakamatsu, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   407   469 - 476   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Polystyrene sphere films were fabricated and the optical properties were investigated using surface plasmon spectroscopy (SPS) and emitted light due to reverse irradiation utilizing SPS Kretschmann configuration. The films were fabricated using sphere dispersed solution with various diameters from about 100 to 300 nm. The morphologies of the fabricated films were observed using atomic force microscopy and the sphere films had almost three layer structure. In SPS curve, large dip and shallow broad dip were observed at around 75degrees and 50degrees, respectively. The dips were considered to be due to the three layer structure and some defects in the film. Furthermore, emitted lights due to reverse irradiation were also observed as a function of the emitted angle in the Kretschmann configuration of the SPS measurement. Emitted lights due to surface plasmon excitation were also observed and the peak angle of the emitted light almost corresponded to the dip angle of the SPS curves.

    DOI: 10.1080/15421400390263848

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  • Fabrication and electrochromic properties of layer-by-layer self-assembled ultrathin films containing water-soluble phthalocyanine 査読

    K Shinbo, K Kato, F Kaneko, K Onishi, RC Advincula, XW Fan, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   407   493 - 500   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Alternate ultrathin films of water-soluble copper (H) phthalocyanine-3,4',4",4'''-tetrasulfonic acid (CuPcTs) and poly(diallyldimethylammonium chloride) (PDADMAC) were fabricated using the electrostatic layer-by-layer self-assembly technique. Linear depositions of the bilayers were observed from the UV-vis absorption spectra and ellipsometry. The average thickness of the CuPcTs monolayer obtained from ellipsometry was about 1.2 nm and CuPcTs molecules were estimated to be tilted to the film surface. The cyclic votammogram (C-V) of the fabricated films in aqueous solution containing 0.1 M KCl suggested the oxidation and reduction of the CuPcTs at around +0.9V and 0.05V respectively. UV-vis absorption spectra were observed for the films at applied voltages of 0.8V and 0V in the KCl aqueous solution and reversible absorption changes were observed.

    DOI: 10.1080/15421400390264054

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  • Multiple surface plasmon excitations and nanostructured devices of organic ultrathin films 査読

    F Kaneko, K Kato, K Shinbo, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   407   459 - 468   2003年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/organic ultrathin films. Structure and optical properties of organic ultrathin films have been evaluated using the ATR measurement due to SP excitations. Recently, emission light through the prism was observed using direct irradiation of a laser beam from air to the organic films, that is, reverse irradiation. The emission spectra strongly depended upon the emission angles through the prism and were caused by multiple SP excitations. The emission properties also depend upon structure of metal and organic thin films, dye molecules, separation between metal and molecules, molecular interaction, and so on. It is thought that the phenomenon is useful for application to new devices utilizing multiple SP excitations, and nanostructured devices of organic films using multiple SP excitations are described.

    DOI: 10.1080/15421400390263820

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  • cDNA microarry analysis on peach fruit 査読

    T Imai, T Yamamoto, N Matsuta, J Yazaki, M Ishikawa, F Fujii, K Shinbo, Z Shimatani, Y Nagata, A Hashimoto, T Ohta, Y Sato, S Honda, K Yamamoto, K Sakata, T Sasaki, N Kishimoto, S Kikuchi, T Hayashi

    PLANT AND CELL PHYSIOLOGY   44   S53 - S53   2003年

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

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  • Surface plasmon excitation and emitted light characteristics of polystyrene sphere films 査読

    K Shinbo, S Miyabayashi, K Kato, F Kaneko, M Tanaka, T Wakamatsu, RC Advincula

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1-3   737 - 740   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Polystyrene submicron and micron sphere films were fabricated and the optical properties were investigated using surface plasmon resonance (SPR) and reverse irradiation utilizing the SPR Kretschmann configuration. BK-7 (n=1.515) and S-TIH53 (n=1.805) prisms were used for the measurements. The diameters of the spheres were 0.1 and 1.0 gm. For the 0.1-mum-sphere films, some SPR dips were observed and were considered to be due to the existence of defects in the film. For the highly packed 1.0-mum-sphere films, SPR dip was observed only in the curves obtained using S-TIH53 prism and it was considered to be due to the size and the large dielectric constant of the sphere. Emitted light due to reverse irradiation was observed as a function of the emitted angle in the Kretschmann configuration. The peak angles of the emitted light almost corresponded to the dip angles of the SPR curves and the emitted light was considered to be due to surface plasmon excitation.

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  • Excitation of multiple surface plasmons and emission light in nanostructured molecular films 査読

    F Kaneko, T Sato, M Terakado, H Hatakeyama, K Shinbo, K Kato, T Wakamatsu

    PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1-3   53 - 56   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/organic dye Langmuir-Blogett (LB) ultrathin films. Emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, that is, reverse irradiation. Intensities and spectra of the emission light through the prism strongly depended upon emission angles and nanostructures of dye LB films and metal ultrathin films in the Kretschmann configuration. The emission properties coincided with resonant conditions of SP excitations in the ATR Kretschmann configuration. It was thought that multiple SPs were excited at the interface of metal and LB films and some of multiple SPs were transferred to emission light corresponding to the resonant conditions of SPs in the ATR method. It is thought that the phenomenon due to multiple SP excitations is very useful for application to new devices.

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  • Nanostructured LB films and emission light due to multiple surface plasmon excitations in the Kretschmann configuration 査読

    F Kaneko, M Terakado, T Sato, H Hatakeyama, W Saito, K Shinbo, K Kato, T Wakamatsu

    ASIANANO 2002, PROCEEDINGS   35 - 40   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/Langmuir-Blodgett (LB) films containing dyes. The emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, i.e., reverse irradiation. The emission intensities depend on the emission angles through the prism, nanostructure of metal and LB films, dye molecules, separation between metal and dye molecules, interactions of dye molecules, etc. The spectra is strongly depended on the emission angles, and the emission light was caused by multiple SP excitations. Nanostructured devices of LB films using SP excitations are described.

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  • Multiple surface plasmon excitations and nanostructured devices of organic ultrathin films 査読

    Futao Kaneko, Keizo Kato, Kazunari Shinbo, Takashi Wakamatsu

    Molecular Crystals and Liquid Crystals   407   63 - 72   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Taylor and Francis Inc.  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/organic ultrathin films. Structure and optical properties of organic ultrathin films have been evaluated using the ATR measurement due to SP excitations. Recently, emission light through the prism was observed using direct irradiation of a laser beam from air to the organic films, that is, reverse irradiation. The emission spectra strongly depended upon the emission angles through the prism and were caused by multiple SP excitations. The emission properties also depend upon structure of metal and organic thin films, dye molecules, separation between metal and molecules, molecular interaction, and so on. It is thought that the phenomenon is useful for application to new devices utilizing multiple SP excitations, and nanostructured devices of organic films using multiple SP excitations are described.

    DOI: 10.1080/744819014

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  • Fabrication and electrochromic properties of layer-by-layer self-assembled ultrathin films containing water-soluble phthalocyanine 査読

    Kazunari Shinbo, Keizo Kato, Futao Kaneko, Ken Onishi, Rigoberto C. Advincula, Xiaowu Fan, Rigoberto C. Advincula

    Molecular Crystals and Liquid Crystals   407   97 - 104   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Taylor and Francis Inc.  

    Alternate ultrathin films of water-soluble copper (II) phthalocyanine-3,4′ ,4″ ,4‴-tetrasulfonic acid (CuPcTs) and poly(diallyldimethylammonium chloride) (PDADMAC) were fabricated using the electrostatic layer-by-layer self-assembly technique. Linear depositions of the bilayers were observed from the UV-vis absorption spectra and ellipsometry. The average thickness of the CuPcTs monolayer obtained from ellipsometry was about 1.2nm and CuPcTs molecules were estimated to be tilted to the film surface. The cyclic votammogram (C-V) of the fabricated films in aqueous solution containing 0.1 M KCl suggested the oxidation and reduction of the CuPcTs at around +0.9 V and 0.05 V respectively. UV-vis absorption spectra were observed for the films at applied voltages of 0.8Vand 0V in the KCl aqueous solution and reversible absorption changes were observed.

    DOI: 10.1080/744819018

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  • Surface plasmon resonance and emitted light properties of polystyrene sphere films 査読

    Kazunari Shinbo, Syunsuke Miyabayashi, Kazushi Yoshizawa, Hidehiko Shimizu, Keizo Kato, Futao Kaneko, Masato Tanaka, Takashi Wakamatsu, Rigoberto C. Advincula

    Molecular Crystals and Liquid Crystals   407   73 - 80   2003年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Taylor and Francis Inc.  

    Polystyrene sphere films were fabricated and the optical properties were investigated using surface plasmon spectroscopy (SPS) and emitted light due to reverse irradiation utilizing SPS Kretschmann configuration. The films were fabricated using sphere dispersed solution with various diameters from about 100 to 300 nm. The morphologies of the fabricated films were observed using atomic force microscopy and the sphere films had almost three layer structure. In SPS curve, large dip and shallow broad dip were observed at around 75° and 50°, respectively. The dips were considered to be due to the three layer structure and some defects in the film. Furthermore, emitted lights due to reverse irradiation were also observed as a function of the emitted angle in the Kretschmann configuration of the SPS measurement. Emitted lights due to surface plasmon excitation were also observed and the peak angle of the emitted light almost corresponded to the dip angle of the SPS curves.

    DOI: 10.1080/744819015

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  • Evaluation of Structures and Functions in Organic Ultrathin Films on Metal Thin Films Utilizing Surface Plasmon Excitations 査読

    K.Kato, K.Shinbo, F.Kaneko, T.Wakamatsu

    KIEE International Transactions on Electrical Material   12C   128 - 135   2002年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Electrical and Emitting Properties of Organic Electroluminescent Diodes with Nanostructured Cathode Buffer-Layers of Al/Alq3 Ultrathin Films 査読

    K.Shinbo, E.Sakai, F.Kaneko, K.Kato, T.Kawakami, T.Tadokoro, S.Ohta, R.C.Advincula

    IEICE Trans. Electron.   E85-C   1233 - 1238   2002年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Emission light from prism/silver/rhodamine-B LB film and multiple surface plasmon excitations in the ATR Kretschmann configuration 査読

    F Kaneko, T Nakano, M Terakado, K Shinbo, K Kato, T Kawakami, T Wakamatsu

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   22 ( 2 )   409 - 412   2002年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Emission light through the prism in the Kretschmann configuration of prism/Ag thin film/rhodamine-B (RB) Langmuir-Blodgett (LB) film has been observed by means of direct irradiation of a laser beam from air to the RB LB film, that is, the reverse irradiation method against the conventional attenuated total reflection (ATR) method. The emission light intensities and the spectra strongly depended upon the emission angle at the prism. The relation between the peak wavelengths of the spectra and the emission angles corresponded to the dispersion property of the resonant excitations of surface plasmons (SPs) in the ATR configuration. It was concluded that the emission light was caused by multiple excitations of SPs in the ATR configuration. Emission light through the prism was also observed below the reflection angle of the resonant one when the SP was resonantly excited in the conventional ATR measurement. This emission light also showed the same property as the one in the reverse irradiation method. It is thought that the phenomenon will be used as a new sensing device. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0928-4931(02)00199-6

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  • Enhancement of optical absorption and photocurrents in solar cells of merocyanine Langmuir-Blodgett films utilizing surface plasmon excitations 査読

    K Kato, H Tsuruta, T Ebe, K Shinbo, F Kaneko, T Wakamatsu

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   22 ( 2 )   251 - 256   2002年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Short-circuit photocurrents (I-SC) due to surface plasmon (SP) excitations were investigated for the solar cells using Langmuir-Blodgett (LB) films of merocyanine (MC) dye molecules. The Schottky photoelectric devices with two kinds of structures, that is, prism/Al/MC LB film/Ag (type A) and prism/MgF2/AlMC LB film/Ag (type B) were prepared. Type A has the Kretschmann configuration and type B has both the Kretschmann and the Otto configurations. In the attenuated total reflection (ATR) measurements, SPs were resonantly excited at the interface between Ag and air for type A and at the interfaces between MgF2 and Al and between Ag and air for type B. The ATR and I-SC properties were simultaneously measured as a function of the incident angles of the laser beams. The peaks of I-SC corresponded to the resonant angles of the ATR curves. The electric fields and optical absorption in the cells were also estimated. The calculated absorption in the MC layers as a function of the incident angles corresponded to the I-SC curves. The optical absorption in the MC layers turns out to be correlated directly to the profiles of I-SC. It was estimated that I-SC could be enhanced by the excitations of SPs in the ATR configurations. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0928-4931(02)00174-1

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  • In situ investigations on the preparations of layer-by-layer films containing azobenzene and applications for LC display devices 査読

    K Shinbo, A Baba, F Kaneko, T Kato, K Kato, RC Advincula, W Knoll

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   22 ( 2 )   319 - 325   2002年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Preparations of alternate layer-by-layer self-assembled films of poly(diallyldimethyl ammonium chloride) (PDADMAC) and Direct Red 80 (DR80, azobenzene dye) and photo-induced surface relief gratings (SRGs) of the films have been investigated in situ using attenuated total reflection (ATR), that is, surface plasmon resonance spectroscopy (SPS) and quartz crystal microbalance (QCM) measurements. Gratings of the PDADMAC/DR80 films were fabricated by exposure to interference patterns of Ar+ laser light at 488 nm for 30 min. The formation of the gratings was observed using atomic force microscopy (AFM). The films were used for applications to liquid crystal (LC) display devices, and aligning properties of nematic liquid crystal molecules, 5CB, on the SRG in the films were also investigated in a hybrid LC cell configuration by monitoring birefringence properties of the LC cell in situ. It was estimated that the LC molecules in the cell did not align immediately after the photo-induced SRG was inscribed, but almost along the gratings after heat treatment at 40 degreesC for 1 min. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0928-4931(02)00214-X

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  • Electrical and emitting properties of organic electroluminescent diodes with nanostructured cathode buffer-layers of Al/Alq3 ultrathin films 査読

    K Shinbo, E Sakai, F Kaneko, K Kato, T Kawakami, T Tadokoro, S Ohta, RC Advincula

    IEICE TRANSACTIONS ON ELECTRONICS   E85C ( 6 )   1233 - 1238   2002年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Organic light emitting diodes (OLEDs) containing nanostructured cathode buffer layers were fabricated, and their electrical and emitting properties were investigated. The OLEDs have an ITO anode/CuPc/TPD/Alq3/buffer layer/Al cathode structure with the buffer layers made from nanostructured alternating layers Alq3 and Al. The driving voltage and the efficiency of the devices were improved by insertion of the buffer layer. It was estimated that some modulations of the Schottky barrier at the, Alq3 and the Al cathode interface were induced due to the insertion of the buffer layer and it caused an enhancement of electron injection from the Al cathode.

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  • Light emission due to multiple surface plasmon excitations from prism/Ag/organic dyes. 査読

    K Shinbo, T Nakano, M Terakado, K Kato, F Kaneko, R Advincula

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   223   U78 - U78   2002年4月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

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  • Light emission property from organic dye thin films due to excitation of multiple surface plasmons 査読

    T Nakano, M Terakado, F Kaneko, K Shinbo, K Kato, T Kawakami, T Wakamatsu

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   41 ( 4B )   2774 - 2778   2002年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Light emission from the prism has been investigated for the attenuated total reflection (ATR) Kretschmann configuration of prism/silver (Ag) film/organic dye thin films by means of the direct irradiation of a laser beam from air to the organic dye films, that is, reverse irradiation. Light emission was observed for merocyanine (MC) Langmuir-Blodgett (LB) films and hetero LB films of MC and crystal violet (CV) on Ag films using reverse irradiation, The light emission intensities and the spectra strongly depended upon the emission angles,v,here the light was observed through the prism. The relation between the peak wavelengths and the emission angles corresponded to the dispersion property of the resonant excitation of surface plasmons (SPs) in the ATR configuration. From the calculated dispersion properties of SPs, it was estimated that the light emission was caused by multiple excitations of SPs. The light emission property also depended upon the structure of the organic molecular thin films, and it was thought that the light emission from the hetero film of MC and CV was due to energy transfer from MC to CV molecules. It is thought that the phenomenon is useful for application to a new luminescent device and sensors.

    DOI: 10.1143/JJAP.41.2774

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  • Evaluation of structure and gas response in porphyrin Langmuir-Blodgett films by attenuated total reflection measurements 査読

    K Kato, H Araki, K Shinbo, F Kaneko, CM Dooling, TH Richardson

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   41 ( 4B )   2779 - 2783   2002年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Attenuated total reflection (ATR) properties were measured for porphyrin Langmuir-Blodgett (LB) films, and the structure and response to NO2 gas were investigated. The porphyrin molecule was 5,10,15,20-tetrakis(3,4-bis[2-ethylhexyloxyphenyl])-21H,23H-porphine (EHO). The EHO LB films were deposited onto Ag evaporated glass substrates by a vertical dipping method with an ultrafast deposition rate of 1000 mm/min. The response of optical absorbance to NO2 gas was very fast. The thickness and the complex dielectric constants of the EHO LB films evaluated from the ATR properties measured at 632.8 nm were thought to be related to the island structure of the EHO LB films. The isolated micron-size domains, which are themselves composed of grains of several nm in diameter, were also observed in the EHO LB films by atomic force microscopy. The ATR properties at 488.0 nm were considered to be related to the dispersion properties due to the optical absorption band of the EHO LB films. From the NO2 gas response measurements, the ATR properties at 488.0 nm were found to be more sensitive than those at 632.8 nm. The response to NO2 gas and the recovery properties in the ATR measurements were also examined.

    DOI: 10.1143/JJAP.41.2779

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  • Alignments of nematic liquid crystal molecules on azo-dye-containing alternate self-assembled films investigated using attenuated total reflection method 査読

    K Shinbo, J Ishikawa, A Baba, F Kaneko, K Kato, RC Advincula

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   41 ( 4B )   2753 - 2758   2002年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    Photoinduced in-plane alignments of nematic liquid crystal (LC) molecules, 5CB, have been investigated in a LC cell prepared with alternate self-assembled films of polyelectrolytes and low-molecular-weight azobenzene molecules on gold electrodes using the attenuated total reflection (ATR) measurement method. A high dichroism of the self-assembled film was observed with the irradiation of linearly polarized light. The ATR properties due to excitations of surface plasmon polaritons (SPP) were observed in the LC cell and changed with the irradiation of linearly polarized visible light to the LC cell. The experimental results corresponded well with the calculated shifts at different orientation states of 5CB molecules. It was estimated that the LC molecules have in-plane alignments and that the LC molecules are oriented perpendicular to the polarization direction of the irradiated visible light. The molecular orientations could be controlled by the polarization direction of irradiated light on the hybrid LC cell. In-situ observations for the cell were also carried out during the irradiation. Furthermore, the thickness and dielectric constants of the self-assembled films were evaluated using the ATR method.

    DOI: 10.1143/JJAP.41.2753

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  • Fabrication and surface plasmon resonance (SPR) properties of polystyrene micro-sphere thin film arrays. 査読

    K Shinbo, S Miyabayashi, H Kobayashi, F Kaneko, K Kato, M Tanaka, RC Advincula

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   223   D24 - D24   2002年4月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

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  • Photo-induced fabrication of surface relief gratings in alternate self-assembled films containing azo dye and alignments of LC molecules 査読

    Futao Kaneko, Takashi Kato, Akira Baba, Kazunari Shinbo, Keizo Kato, Rigoberto C Advincula

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   198-200   805 - 810   2002年2月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Elsevier  

    Photo-induced surface relief gratings of alternate layer-by-layer self-assembled films containing azobenzene dyes were fabricated. The alignment properties of nematic liquid crystal (LC) molecules on these films were investigated in a hybrid LC cell configuration. Poly(diallyldimethylammonium chloride) (PDADMAC) and Direct Red 80 (DR80, azobenzene dye) were deposited using the alternate layer-by-layer self-assembly method. The gratings of the PDADMAC/DR80 films were fabricated by exposure to interference patterns of Ar+ laser light at 488 nm. The formation of the gratings on the films was observed using atomic force microscopy. Furthermore, the alignment properties of LC molecules, 5CB, on the films were investigated by monitoring the change in birefringence of the LC cell in situ. This in-plane alignment was observed after ∼30 min exposure with the laser, simultaneous with the formation of the interference patterns. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01005-6

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  • Surface plasmon resonance properties and gas response in porphyrin Langmuir-Blodgett films 査読

    K Kato, CA Dooling, K Shinbo, TH Richardson, F Kaneko, R Tregonning, MO Vysotsky, CA Hunter

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   811 - 816   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Surface plasmon resonance (SPR) properties were measured for porphyrin Langmuir-Blodgett (LB) films and the response to NO2 gas was investigated. The porphyrin molecule was 5,10,15,20-tetrakis(3,4-bis[2-ethylhexy-loxyphenyl])-21H, 23H-porphine (EHO). The EHO porphyrin LB films were deposited onto the cover glass with evaporated Ag thin films by vertical dipping method with a very fast deposition rate of 1000 mm min(-1). The SPR measurements were carried out at wavelengths of 488 and 632.8 nm. The SPR properties measured at 488 nm were considered to be related to the dispersion properties due to the optical absorption band of the EHO LB films. The thickness and the complex dielectric constants of the EHO LB films evaluated from the SPR properties measured at 632.8 nm were thought to be related to the island structure of the EHO LB films. From the NO2 gas response measurements, the SPR properties at 488 nm were found to be more sensitive to NO2 gas than those at 632.8 nm. The response rate to NO2 gas and the recovery properties were also examined. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01006-8

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  • Electrical and luminescent properties due to gas adsorption in electroluminescent device of metal-free phthalocyanine 査読

    K Shinbo, M Minagawa, H Takasaka, K Kato, F Kaneko, T Kawakami

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   905 - 909   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Electroluminescent (EL) devices of metal-free phthalocyanines (H2Pc) were fabricated and electrical and luminescent properties due to NO, gas adsorption were studied. The device had an ITO bottom electrode (anode)/H(2)pC (100 nm)/Al top electrode (cathode) structure. The H2Pc and the Al films were vacuum evaporated. Especially, the Al films were deposited using an oblique deposition method in order to form porous structure to enable NO2 gas adsorption into the H2PC layer through the Al film. The conduction currents and the EL intensities of the device increased with NO2 adsorption. Open-circuit voltage generations due to NO2 gas adsorption were also observed. It was estimated that the adsorbed NO2 molecules in H2Pc generated holes by capturing negative electrons and charge separation of the negative charged NO2 and positive holes induced the open circuit voltage. It was concluded that the increase in the conduction currents due to the gas adsorption was caused by the modification of the depletion layer, and that efficient injection of electrons and recombination of carriers produced the improvement in the EL efficiency. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01018-4

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  • Photo-induced in-plane alignment of LC molecules on layer-by-layer self-assembled films containing azo dyes evaluated by attenuated total reflection measurements 査読

    J Ishikawa, A Baba, F Kaneko, K Shinbo, K Kato, RC Advincula

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   917 - 922   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The photo-induced in-plane alignment of nematic liquid crystal (LC) molecules, 5CB, has been investigated in a cell prepared with alternate layer-by-layer self-assembly of polyelectrolyte and low-molecular weight azobenzene dye films on gold electrodes using the attenuated total reflection (ATR) measurement method. The ATR properties due to excitation of surface plasmon polaritons were observed in the LC cell. They sensitively changed with irradiation of linearly polarized visible light, The experimental results corresponded well with the calculated ATR curves at different polarization states. We have demonstrated that in-plane alignment of the LC molecules on the self-assembled films could also be controlled by the polarization direction of irradiated visible light on the LC cell. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01020-2

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  • Gas sensing properties of porphyrin assemblies prepared using ultra-fast LB deposition 査読

    TH Richardson, CM Dooling, O Worsfold, LT Jones, K Kato, K Shinbo, F Kaneko, R Tregonning, MO Vysotsky, CA Hunter

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   843 - 857   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The UV-vis absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis(3,4-bis[2-ethylhexyloxyphenyl])21H,23H-porphine is very sensitive to low concentrations of NO2. LB films prepared at very high deposition rates (similar to 1000 mm min(-1)) yield t(50) response and recovery times of 25 and 33 s, respectively, and show a sensitivity of 60% relative absorbance change (at 430 nm) for 4.4 ppm NO2. Atomic force microscopy shows that the morphology of these films is characterised by isolated micron-size domains, which are themselves composed of grains of several nm in diameter. This unconventional LB structure leads to a useful sensing material as a result of the molecular functionality of the porphyrin coupled to the enhanced surface area of the porous film assembly. The optical response of the EHO gradually decreases as its temperature is increased, resulting from the shift in the adsorption-desorption equilibrium towards desorption. An activation energy for adsorption of 0.68 eV is obtained. The spectrum recovers fully after exposure to NO2 and the rate of recovery can be accelerated dramatically with gentle heating (similar to 350 K) for a few seconds. The concentration dependence of the optical response over the range 0.8-4.4 ppm follows a Langmuir model. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01011-1

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  • Network Management System CX6600-NM 査読

    S Kasaki, H Yamanaka, K Shinbo, T Oshima, K Momohara, K Hayakawa

    NEC RESEARCH & DEVELOPMENT   43 ( 1 )   79 - 83   2002年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NEC CORPORATION  

    This paper describes the network management system CX6600-NM that monitors and controls the IP network CX product which is composed on the IP network. CX6600-NM has the management function of QoS/VoIP/UMS/VPN at the value-added feature, as well as a fault management, a configuration management and a performance management which are basic features for network management system. These value-added features being integrated with such systems as SMS (Service Management System) enable advanced service provisioning.

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  • Nano-structure control of cathode buffer-layers and luminescent properties of organic electroluminescent device 査読

    K Shinbo, E Sakai, F Kaneko, K Kato, T Kawakami, T Tadokoro, S Ohta, RC Advincula

    ORGANIC OPTOELECTRONIC MATERIALS, PROCESSING AND DEVICES   708   95 - 100   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MATERIALS RESEARCH SOCIETY  

    Organic light emitting diodes (OLEDs) containing cathode buffer layers of nanometer thickness were fabricated and their electrical and emitting properties were investigated. The OLEDs have an indium tin oxide (ITO) anode/ copper phthalocyanine (CuPc) / N, N'-dephenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD) / 8- hydroxyquinoline aluminum (Alq3) / buffer layer / Al cathode structure with the buffer layers made from alternating thin films of Alq3 and Al with nanometer thickness. Improvement of driving voltage and the efficiency for the devices were observed by insertion of the buffer layer. It was estimated that some modulations of the Schottky barrier at the Alq3 and the Al cathode interface were induced due to the insertion of the buffer layer and it caused an enhancement of electron injection from the Al cathode. A model of the band structure at the buffer layer was proposed.

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  • cDNA microarray analysis of gene expression during Fe-deficiency stress in barley suggests that polar transport of vesicles is implicated in phytosiderophore secretion in Fe-deficient barley roots 査読

    T Negishi, H Nakanishi, J Yazaki, N Kishimoto, F Fujii, K Shinbo, K Yamamoto, K Sakata, T Sasaki, S Kikuchi, S Mori, N Nishizawa

    PLANT AND CELL PHYSIOLOGY   43   S77 - S77   2002年

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

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  • Nanostructured lb films and emission light due to multiple surface plasmon excitations in the kretschmann configuration 査読

    Futao Kaneko, Mitsuru Terakado, Toshiharu Sato, Hirotsugi Hatakeyama, Wataru Saito, Kazunari Shinbo, Keizo Kato, Takashi Wakamatsu

    International Journal of Nanoscience, Vol 1, Nos 5 and 6   1 ( 5-6 )   409 - 414   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/Langmuir-Blodgett (LB) films containing dyes. The emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, i.e., reverse irradiation. The emission intensities depend on the emission angles through the prism, nanostructure of metal and LB films, dye molecules, separation between metal and dye molecules, interactions of dye molecules, etc. The spectra is strongly depended on the emission angles, and the emission light was caused by multiple SP excitations. Nanostructured devices of LB films using SP excitations are described.

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  • Microarray analysis of gene expression in rice plants and silicon nutrition 査読

    S Watanabe, E Shimoi, J Yazaki, F Fujii, K Shinbo, Z Shimatani, Y Nagata, A Hashimoto, T Ohta, Y Sato, S Honda, K Yamamoto, K Sakata, T Sasaki, N Kishimoto, S Kikuchi, H Hayashi, T Yoneyama, T Fujiwara

    PLANT AND CELL PHYSIOLOGY   43   S199 - S199   2002年

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

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  • Microarray analysis of sink-source transition in rice leaf sheaths 査読

    S Takahashi, K Ishimaru, M Kosone, J Yazaki, F Fujii, K Shinbo, K Yamamoto, K Sakata, T Sasaki, N Kishimoto, S Kikuchi

    PLANT AND CELL PHYSIOLOGY   43   S190 - S190   2002年

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

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  • A high-capacity switching method for IP datagrams with multistage networks 査読

    T Saito, H Aida, T Aoki, N Nishimura, K Shinbo

    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS   85 ( 8 )   57 - 65   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    The rapidly spreading use of the Internet and the general use of video communication through the Internet have caused a rapid increase in Internet traffic. It is highly probable that the Internet will be used as the network for future multimedia communications. In that case, the capacity of IP routers for the Internet must be enlarged. At present, an IP router capacity of several gigabits per second can be realized, but ATM technology must be applied if a still larger capacity is to be achieved. The IP traffic is of variable length, and the packets are long, which can be handled by ATM. If a high-capacity switch that can handle packets of variable length is created, performance will be improved compared to high-capacity switches based on ATM. The purpose of this paper is to achieve a capacity of 1 Tbps order. Several IP datagram switching methods are proposed and evaluated. (C) 2002 Wiley Periodicals, Inc.

    DOI: 10.1002/ecja.1118

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  • Analyses of rice genes respond on low phosphorus condition using microarrays 査読

    J Wasaki, R Yonetani, S Kuroda, T Shinano, J Yazaki, F Fujii, K Shinbo, K Yamamoto, K Sakata, T Sasaki, N Kishimoto, S Kikuchi, M Osaki

    PLANT AND CELL PHYSIOLOGY   43   S238 - S238   2002年

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    記述言語:英語   出版者・発行元:OXFORD UNIV PRESS  

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  • Multiple surface plasmon excitations in molecular thin films on silver films in the Kretschmann ATR configuration 査読

    F Kaneko, T Nakano, M Terakado, K Shinbo, K Kato, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   377   53 - 56   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Emission light through the prism has been investigated from the Kretschmann configuration of the prism/ Ag thin film/ rhodamine-B (RB) LB Film in the resonant excitation of the attenuated total reflection (ATR) measurement. The emission light and the spectra strongly depended upon the emission angles where the light was observed. The emission properties corresponded to the dispersion property of the resonant excitations of surface plasmons (SPs) in the ATR configuration. It was concluded that the emission light was caused by multiple excitations of SPs in the AFR configuration. It is thought that the phenomenon will be used as a new sensing device.

    DOI: 10.1080/10587250290088528

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  • Photoelectric cells of merocyanine Langmuir-Blodgett films utilizing surface plasmon excitations 査読

    K Kato, F Takahashi, K Shinbo, F Kaneko, T Wakamatsu

    ORGANIC OPTOELECTRONIC MATERIALS, PROCESSING AND DEVICES   708   391 - 396   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MATERIALS RESEARCH SOCIETY  

    Short-circuit photocurrents (I-SC) due to surface plasmon (SP) excitations have been investigated for the photoelectric cells using Langmuir-Blodgett (LB) films of merocyanine (MC) dye. The MC dye exhibits p-type conduction, and the Schottky and Ohmic contacts are obtained at the interfaces between MC LB films and Al thin films and between MC LB films and Ag thin films, respectively. Since the Schottky diodes show the photoelectric effects, the Schottky photoelectric cells have been constructed. The cells with two kinds of structures, that is, prism/Al/MC/Ag (type I) and prism/MgF2/Al/MC/Ag (type II), have been prepared. In the attenuated total reflection (ATR) method, the types I and II have the Kretschmann and both the Kretschmann and Otto configurations, respectively. SP has been resonantly excited at the interface between Ag and air for the type I and at the interfaces between MgF2 and Al between Ag and air for the type II. The ATR and the Isc properties have been simultaneously measured as a function of the incident angles of the laser beams. The peaks of the I-SC have corresponded to the resonant angles of the ATR curves. The electric fields and optical absorptions in the cells have been also calculated using the dielectric constants and the film thicknesses obtained from the ATR measurements. The calculated absorptions in the MC layers as a function of the incident angles have corresponded to the results of I-SC. It has been estimated that the I-SC for both types I and II could be enhanced by the excitations of SP in the ATR configurations.

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  • Multiple surface plasmon excitations in molecular thin films on silver films in the Kretschmann ATR configuration 査読

    F Kaneko, T Nakano, M Terakado, K Shinbo, K Kato, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   377   53 - 56   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Emission light through the prism has been investigated from the Kretschmann configuration of the prism/ Ag thin film/ rhodamine-B (RB) LB Film in the resonant excitation of the attenuated total reflection (ATR) measurement. The emission light and the spectra strongly depended upon the emission angles where the light was observed. The emission properties corresponded to the dispersion property of the resonant excitations of surface plasmons (SPs) in the ATR configuration. It was concluded that the emission light was caused by multiple excitations of SPs in the AFR configuration. It is thought that the phenomenon will be used as a new sensing device.

    DOI: 10.1080/10587250290088528

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  • Nanostructured lb films and emission light due to multiple surface plasmon excitations in the kretschmann configuration 査読

    Futao Kaneko, Mitsuru Terakado, Toshiharu Sato, Hirotsugi Hatakeyama, Wataru Saito, Kazunari Shinbo, Keizo Kato, Takashi Wakamatsu

    International Journal of Nanoscience, Vol 1, Nos 5 and 6   1 ( 5-6 )   409 - 414   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal/Langmuir-Blodgett (LB) films containing dyes. The emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, i.e., reverse irradiation. The emission intensities depend on the emission angles through the prism, nanostructure of metal and LB films, dye molecules, separation between metal and dye molecules, interactions of dye molecules, etc. The spectra is strongly depended on the emission angles, and the emission light was caused by multiple SP excitations. Nanostructured devices of LB films using SP excitations are described.

    DOI: 10.1142/S0219581X02000413

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  • Emission light from prism/silver/molecular ultrathin films and excitations of multiple surface plasmons in ATR Kretschmann configuration 査読

    F Kaneko, T Nakano, T Sato, K Shinbo, K Kato, T Kawakami, T Wakamatsu

    POLYMER INTERFACES AND THIN FILMS   710   225 - 230   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:MATERIALS RESEARCH SOCIETY  

    Emission light through the prism has been investigated from the Kretschmann configuration of the prism/ Ag thin film/ rhodamine-B (RB) LB film in the resonant excitation of the attenuated total reflection (ATR) measurement. The emission light and the spectra strongly depended upon the emission angles where the light was observed. The emission properties corresponded to the dispersion relation of the resonant excitations of surface plasmons (SPs) in the ATR configuration. It was concluded that the emission light was caused by multiple excitations of SPs in the ATR configuration. it is thought that the phenomenon will be used as a new sensing device.

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  • Emission from merocyanine Langmuir-Blodgett films utilizing surface plasmon excitation 査読

    K Kato, M Terakado, K Shinbo, F Kaneko, T Wakamatsu

    THIN SOLID FILMS   393 ( 1-2 )   97 - 102   2001年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Attenuated total reflection (ATR) properties, scattered light and emission due to surface plasmon (SP) excitation from merocyanine (MC) Langmuir-Blodgett (LB) films on Ag thin films were investigated. A Kretschmann configuration of the ATR measurement, prism/Ag thin film/air or prism/Ag thin film/MC LB film/air structure, were used for the SP excitation. The thicknesses and the dielectric constants of the Ag thin films and the MC LB films were obtained from the ATR measurement. Scattered light due to the SP excitation was also observed from the Ag thin film or the MC LB film in the ATR measurements. Furthermore, emission was observed through the prism when a laser beam was irradiated to the sample from the air. The angles of the emission peaks almost corresponded to the resonant angles of the ATR curves. It was considered that the emission was due to the SP excitation and depended on the surface roughness of the films. The intensity of the emission from the Ag thin film strongly depended on the incident angle of the laser beam. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0040-6090(01)01106-3

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  • Taking advantage of optical and electrical properties of organic molecules for gas sensing applications 査読

    TH Richardson, CM Dooling, O Worsfold, LT Jones, K Kato, K Shinbo, F Kaneko, R Treggoning, MO Vysotsky, CA Hunter

    THIN SOLID FILMS   393 ( 1-2 )   259 - 266   2001年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The discipline of molecular electronics has grown rapidly over the last 10 years and is driven by the promise of the enhanced applied physical properties of functionalised organic materials compared to their inorganic partners. The subject can be divided generally into two broad themes, namely active molecular-scale electronics (or photonics), in which the control or generation of charge (or photons) at the nanoscale is attempted, and passive supra-molecular electronics (or photonics), in which the specific functionality of the molecules is modified by some interaction or process. In this paper, an example of the latter approach to molecular electronics will be given and this will describe the gas sensing properties of a tetra-substituted porphyrin molecule. The optical absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis(3,4-bis[2-ethylhexyloxy]phenyl)-21H,23H-porphine(EHO) is highly sensitive to low concentrations of NO2. LB films prepared at much faster than conventional deposition rates (similar to 1000 min min(-1)) yield t(50) response and recovery times of 25 and 33 s, respectively, and show a sensitivity of 60% relative absorbance change (at 430 nm) for 4.4 ppm NO2. The morphology of these films is revealed using atomic force microscopy to contain isolated micron-size domains which are composed of grains of several nm in diameter. This unconventional structure leads to a useful sensing material as a result of the molecular functionality of the porphyrin coupled to the enhanced surface area of the porous film assembly. The EHO film shows a gradually diminishing optical response as its temperature is increased, resulting from the shift in the adsorption- desorption equilibrium towards desorption. The spectrum recovers fully after exposure to NO2. The rate of recovery is slow at room temperature but can be accelerated dramatically with gentle heating (similar to 350 K) for a few seconds. The kinetics of the gas sensing process have been modelled and found to fit Elovichian surface adsorption for an initial fast surface adsorption process. This is followed by a much slower diffusive process in which the NO2 molecules diffuse through the bulk of the assembly. The concentration dependence of the optical response over the range 0.8-4.4 ppm follows a Langmuir model. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0040-6090(01)01080-X

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  • フタロシアニン電界発光素子におけるNO_2ガス吸着に伴う電気伝導および発光特性の変化 査読

    皆川 正寛, 高坂 秀明, 加藤 景三, 金子 双男, 新保 一成

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   121 ( 7 )   642 - 647   2001年7月

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    記述言語:日本語   出版者・発行元:電気学会  

    DOI: 10.1541/ieejfms1990.121.7_642

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  • ポルフィリンLB膜の全反射減衰特性とガス応答 査読

    加藤 景三, 荒木 仁, Dooling Colin M., H. RICHARDSON Tim, 新保 一成, 金子 双男

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   121 ( 7 )   677 - 682   2001年7月

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    記述言語:日本語   出版者・発行元:電気学会  

    DOI: 10.1541/ieejfms1990.121.7_677

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  • Luminescent properties of SrAl2O4 : Eu thin films deposited by intense pulsed ion-beam evaporation 査読

    K Kato, Y Ogura, M Sengiku, K Shinbo, F Kaneko, Y Oda, K Yatsui

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   40 ( 2B )   1038 - 1041   2001年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    SrAl2O4 activated with Eu, a long-phosphorescence material with high brightness, has been successfully deposited on Si substrates using intense pulsed ion-beam evaporation. Efficient preparation of long-phosphorescence thin films has been achieved using a high-density ablation plasma produced by the interaction of an intense pulsed ion-beam with the SrAl2O4:Eu target. The prepared SrAl2O4:Eu thin films had a polycrystalline structure without annealing and showed a typical photoluminescence of SrAl2O4:Eu at around 520 nm. Thermoluminescence (TL) measurements were carried out in order to obtain the lifetimes of the phosphorescence. In particular, TL spectra in the higher temperature region, which contributed to the long phosphorescence, were examined by the partial heating technique to evaluate the distributed trap depths and the lifetimes. The phosphorescence lifetime at 300 K for the prepared film was found to be about 180 min.

    DOI: 10.1143/JJAP.40.1038

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  • Preparation of SrAl2O4 : Eu phosphor thin films by intense pulsed ion-beam evaporation 査読

    M Sengiku, Y Oda, WH Jiang, K Yatsui, Y Ogura, K Kato, K Shinbo, F Kaneko

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   40 ( 2B )   1035 - 1037   2001年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:INST PURE APPLIED PHYSICS  

    SrAl2O4 activated with Eu phosphors has been known to exhibit high brightness and long-lasting phosphorescence without radioactive materials. In this paper, SrAl2O4Eu thin films have been successfully deposited on Si(100) or graphite substrates using an intense pulsed ion-beam evaporation technique. The results of X-ray diffraction and photoluminescence suggest that SrAl2O4:Eu thin films which have a polycrystalline structure can be produced in vacuum, without substrate heating and annealing. The composition and morphology of the films have been analyzed by Rutherford backscattering spectroscopy (RBS) and scanning electron microscopy (SEM). From RES analysis, we have obtained good stoichiometry between the target and the films prepared.

    DOI: 10.1143/JJAP.40.1035

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  • Cooperativity of binuclear Zn(II) complexes of bisimidazolyl ligands in the hydrolysis of bis(2,4-dinitrophenyl) phosphate in aqueous solution 査読

    S Kondo, K Shinbo, T Yamaguchi, K Yoshida, Y Yano

    JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2   ( 1 )   128 - 131   2001年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    Hydrolysis of bis(2,4-dinitrophenyl) phosphate (BDNPP) by Zn(II) with ligands bearing plural bis(imidazol-2-yl) groups was kinetically studied in aqueous solution. The binuclear Zn(lr) complex of 1,3-bis(diimidazol-2-yl-hydroxymethyl)benzene (2a) was found to be most effective for hydrolysis of BDNPP (1.2 x 10(3)-fold). ESI-MS study revealed formation of 2a . Zn(II)(2) in MeOH-H2O, suggesting that the rate acceleration is due to so called double Lewis acid activation. The pH-rate profile showed that the pK(a) of the active species is around 7.5. The rate accelerations by the complexes of 2a with other metal ions were 4.3-fold for Ni(II), 7.1-fold for Co(II), and 1.9 x 10(2)-fold for La(III).

    DOI: 10.1039/b002395g

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  • Photo-induced in-plane alignments of liquid crystal molecules on alternate self-assembled ultrathin films containing azo-dye and evaluation by the attenuated total reflection measurement 査読

    K Shinbo, J Ishikawa, A Baba, F Kaneko, K Kato, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   370   193 - 196   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    A liquid crystal (LC) cell with alternate self-assembled films containing azobenzene dye as aligning layers was fabricated and photo-induced inplane alignments of nematic LC molecules, 5CB, have been investigated in the cell using the attenuated total reflection (ATR) method. The ATR properties due to excitations of surface plasmon polaritons (SPP) were observed in the LC cell and sensitively changed with irradiation of linearly polarized visible light to the LC cell. The experimental results corresponded well with the calculated shifts at different alignment states. It was evaluated that the LC molecules within the penetration length of the SPP (about 130 nm) were aligned perpendicular to the polarized direction of the irradiation light, and that the tilt angle was almost 0 degree.

    DOI: 10.1080/10587250108030069

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  • Detection of evanescent fields on arachidic aced Lb films on AL - Films caused by resonantly excited surface plasmons 査読

    T Nakano, H Kobayashi, F Kaneko, K Shinbo, K Kato, TA Kawakami, T Wakamatsu

    NOVEL METHODS TO STUDY INTERFACIAL LAYERS   11   43 - 53   2001年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    DOI: 10.1016/S1383-7303(01)80015-6

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  • Surface plasmon emission spectra from rhodamine-B Lb thin films on silver thin films 査読

    T. Nakano, T. Wakamatsu, H. Kobayashi, F. Kaneko, K. Shinbo, K. Kato, T. Kawakami

    Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   370   265 - 268   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Taylor and Francis Inc.  

    Spectra of emission light from Ag/ Rhodamine-B (RB) LB films due to surface plasmon (SP) excitations have been investigated using an attenuated total reflection (ATR) method and a reversed ATR (RATR) method. In the R-ATR configuration, emission light was observed through the prism, and the intensities and spectra strongly depended upon the emission angle where the light was observed. The relation between the wavelengths and the emission angles agreed with the resonant conditions of excitations of SPs in the ATR configuration. It was concluded that the emission light was caused by excitations of multiple SPs. © 2001 Taylor and Francis, Inc.

    DOI: 10.1080/10587250108030085

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  • Enhancement of photocurrents in merocyanine LB film cell utilizing surface plasmon polariton excitations 査読

    F Kaneko, K Shinbo, K Kato, T Ebe, H Tsuruta, S Kobayashi, T Wakamatsu

    NOVEL METHODS TO STUDY INTERFACIAL LAYERS   11   85 - 94   2001年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    DOI: 10.1016/S1383-7303(01)80018-1

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  • Fast, reversible optical sensing of NO2 using 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine assemblies 査読

    CM Dooling, O Worsfold, TH Richardson, R Tregonning, MO Vysotsky, CA Hunter, K Kato, K Shinbo, F Kaneko

    JOURNAL OF MATERIALS CHEMISTRY   11 ( 2 )   392 - 398   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    The optical absorbance spectrum of LB film assemblies of 5,10,15,20-tetrakis[3,4-bis(2-ethylhexyloxy)phenyl]-21H,23H-porphine (EHO) is highly sensitive to low concentrations of NO2 in nitrogen. LB films prepared at much faster than conventional deposition rates (similar to 1000 mm min(-1)) yield t(50) response and recovery times of 25 s and 33 s respectively and show a sensitivity of 60% relative absorbance change (at 430 nm) for 4.4 ppm NO2. The morphology of these films is revealed using atomic force microscopy to contain isolated micron-size domains which are themselves composed of grains of several nm in diameter. This unconventional structure leads to a useful sensing material as a result of the molecular functionality of the porphyrin coupled to the enhanced surface area of the porous film assembly. The EHO film shows a gradually diminishing optical response as its temperature is increased, resulting from the shift in the adsorption-desorption equilibrium towards desorption as expected. The UV-visible spectrum recovers fully after exposure to NO2. The rate of recovery is slow at room temperature but can be accelerated dramatically with gentle heating (similar to 350 K) for a few seconds. The concentration dependence of the optical response over the range 0.8-4.4 ppm follows a Langmuir model.

    DOI: 10.1039/b006342h

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  • Scattered light and emission from AG thin film and merocyanine Langmuir-Blodgett film on AG thin film due to surface plasmon polariton excitation 査読

    K Shinbo, K Honma, M Terakado, T Nakano, K Kato, F Kaneko, T Wakamatsu

    NOVEL METHODS TO STUDY INTERFACIAL LAYERS   11   71 - 83   2001年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    DOI: 10.1016/S1383-7303(01)80017-X

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  • Surface plasmon emission spectra from Rhodamine-B Lb thin films on silver thin films 査読

    T Nakano, T Wakamatsu, H Kobayashi, F Kaneko, K Shinbo, K Kato, T Kawakami

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   370   265 - 268   2001年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Spectra of emission light from Ag/ Rhodamine-B (RB) LB films due to surface plasmon (SP) excitations have been investigated using an attenuated total reflection (ATR) method and a reversed ATR (R-ATR) method. In the R-ATR configuration, emission light was observed through the prism, and the intensities and spectra strongly depended upon the emission angle where the light was observed. The relation between the wavelengths and the emission angles agreed with the resonant conditions of excitations of SPs in the ATR configuration. It was concluded that the emission light was caused by excitations of multiple SPs.

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  • 金属/有機薄膜における表面プラズモンの励起と光放射特性 査読

    中野 貴之, 小林 肇, 金子 双男, 新保 一成, 加藤 景三, 川上 貴浩, 若松 孝

    電気学会論文誌A(基礎・材料・共通部門誌)   121 ( 7 )   683 - 688   2001年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    DOI: 10.1541/ieejfms1990.121.7_683

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  • A Photoelectric Property of Merocyanine LB Film Cell Utilizing Surface Plasmon Polariton Excitation 査読

    K. Shinbo, T. Ebe, F. Kaneko, K. Kato, T. Wakamatsu

    IEICE Trans. Electron   E83-C, 7   1081 - 1087   2000年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Preparation of sputtered SrAl2O4 : Eu films and their thermoluminescence properties 査読

    Tsutai, I, T Kamimura, K Kato, F Kaneko, K Shinbo, M Ohta, T Kawakami

    ELECTRICAL ENGINEERING IN JAPAN   132 ( 1 )   7 - 14   2000年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    SrAl2O4 activated with Eu, a new fluorescent material having a long decay time, was deposited on Si substrates using an RF sputtering technique with facing targets. The as-deposited films did not show any peaks in the X-ray diffraction spectra and no photoluminescence was observed. However, X-ray diffraction peaks and a photoluminescent peak at about 520 nm were observed after annealing in a reducing Ar+H-2 gas and an inert Ar gas. The structure of the sputtered films was investigated using EDS and SEM. The thermoluminescence peaks were observed, and the Lifetime of the fluorescence and the activation energies were calculated from the peaks. The results in this work are useful for future applications. (C) 2000 Scripta Technica.

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  • Optical properties in Langmuir-Blodgett films of crystal violet dyes adsorbing cyanine dyes 査読

    Keizo Kato, Kazunari Shinbo, Katsunari Obata, Futao Kaneko

    Synthetic Metals   111   615 - 618   2000年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Sequoia SA  

    Langmuir-Blodgett (LB) films of crystal violet (CV) dyes incorporating cyanine (Cy) dyes (CVCy LB films) have been prepared by the diffusion-adsorption LB method, and the optical properties have been investigated. In the photoluminescence (PL) spectrum of the CVCy LB films, a weak, narrow peak at around 470 nm and an intense peak at around 700 nm were observed, which were caused by the Cy and the CV dyes, respectively. The PL peak at about 470 nm became more intense as the irradiation time of the laser excitation light increased. The PL peak initially appearing at about 700 nm, broadened and moved to lower wavelength with increasing irradiation time. CV/DSACy LB heterofilm of the CV LB film without Cy dyes on distearyldimethylammonium bromide (DSA) LB film with adsorbed Cy dyes (DSACy LB film) was also prepared for the comparison. The absorption spectrum was similar to that of the CVCy LB film. On the contrary, in the PL spectrum of the CV/DSACy LB hetrofilm, the peak at around 470 nm was more intense and the peak at around 700 nm was weaker. From the results, the PL properties of the CVCy LB films were thought to be related to the energy transfer between the CV and the Cy dyes.

    DOI: 10.1016/S0379-6779(99)00391-4

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  • Enhancement of short-circuit photocurrent in merocyanine LB film cell utilizing surface plasmon polariton excitation 査読

    K Shinbo, A Baba, H Tsuruta, T Ebe, F Kaneko, K Kato, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   349   231 - 234   2000年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH SCI PUBL LTD  

    In this study, photocurrents enhanced by the surface plasmon polariton (SPP) excitation were observed in a merocyanine (MC) Langmuir-Blodgett (LB) film cell. The excitation of the SPP was carried out by the incidence of a laser beam in the attenuated total reflection (ATR) measurement system. The excitation of the SPF induces the strong absorption of the incident light and large photocurrents in the device.

    DOI: 10.1080/10587250008024907

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  • Photo-induced alignments of liquid crystal molecules on alternate self-assembly films evaluated by the attenuated total reflection measurement 査読

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi, Rigoberto C. Advincula

    Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals   347   15 - 24   2000年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Taylor and Francis Inc.  

    Photo-induced in-plane alignments of nematic liquid crystal (LC) molecules, 5CB, have been investigated in the cell with alternate self-assembly films of polyelectrolyte and low-molecular weight dyes on the gold electrodes using the attenuated total reflection (ATR) measurement method. Reflectivities due to the excitations of the surface plasmon polariton (SPP) were observed in the ATR properties of the LC cell. In-plane switching of LC molecules adjacent to the aligning layer was evaluated from the ATR curves by means of irradiation of the linearly polarized visible light to the LC cell. It was also estimated that the re-orientation of the LC molecules occurred within about 130 nm from the surface of the aligning layer on the prism by the irradiation of the polarized light. 2000 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.

    DOI: 10.1080/10587250008024825

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  • A measurement of evanescent fields generating on metal thin films and Langmuir-Blodgett ultrathin films 査読

    T Nakano, T Wakamatsu, H Kobayashi, F Kaneko, K Shinbo, K Kato, T Kawakami

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   349   235 - 238   2000年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH SCI PUBL LTD  

    Surface plasmons (SPs) were resonantly excited for aluminum (Al) thin films and arachidate acid (C20) LB ultrathin films on the substrates in a Kretschmann configuration of the attenuated total reflection (ATR) method. Evanescent fields generating on the Al thin films and the LB films due to excitations of the SPs were detected as luminescent light from a metallic needle probe covered with CdS in the localized evanescent fields. The luminescent light, that is, the evanescent fields were measured as a Function of the incident angle of the laser beam exciting the SPs and as a function of the distance from the surface. The luminescent light intensity was biggest at a lower angle than the resonant angle. These properties were calculated and discussed. Evanescent fields were also measured for C20 LB films on Al thin films.

    DOI: 10.1080/10587250008024908

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  • Photo-induced alignments of liquid crystal molecules on alternate self-assembly films evaluated by the attenuated total reflection measurement 査読

    A Baba, F Kaneko, K Shinbo, K Kato, S Kobayashi, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   347   259 - 268   2000年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH SCI PUBL LTD  

    Photo-induced in-plane alignments of nematic liquid crystal (LC) molecules, 5CB, have been investigated in the cell with alternate self-assembly films of polyelectrolyte and low-molecular weight dyes on the gold electrodes using the attenuated total reflection (ATR) measurement method. Reflectivities due to the excitations of the surface plasmon polariton (SPP) were observed in the ATR properties of the LC cell. In-plane switching of LC molecules adjacent to the aligning layer was evaluated from the ATR curves by means of irradiation of the linearly polarized visible light to the LC cell. It was also estimated that the re-orientation of the LC molecules occurred within about 130 nm from the surface of the aligning layer on the prism by the irradiation of the polarized light.

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  • Evaluation of temperature and voltage dependences of nematic liquid crystal molecules on Langmuir-Blodgett films in the thick cell using the attenuated total reflection method 査読

    A Baba, F Kaneko, K Shinbo, T Wakamatsu, K Kato, S Kobayashi

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   8-9   145 - 150   1999年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Tilt angles of nematic liquid crystal molecules, 5CB, have been investigated in the thick cells having aligning layers of polyimide (PI) Langmuir-Blodgett (LB) films on aluminum electrodes using the attenuated total reflection (ATR) measurement method. The ATR curves strongly depended upon AC voltages applied to the cells and the properties at each voltage were similar between 17 and 25 degrees C. The resonant excitations of the surface plasmon polariton (SPP) were observed in a broad region of the incident angle in the ATR measurements. The tilt angles of the liquid crystal molecules were calculated by fitting the theoretical ATR curves to the experimental ones. The results showed that the ATR measurement method was very useful for evaluating behaviors of liquid crystal molecules in thick cells. (C) 1999 Elsevier Science S.A. All rights reserved.

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  • 厚いセル内のLB膜上液晶分子の全反射減衰法による評価 査読

    馬場 暁, 金子 双男, 新保 一成, 加藤 景三, 小林 敏志, 若松 孝

    電気学会論文誌A(基礎・材料・共通部門誌)   119 ( 1 )   124 - 129   1999年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    Behaviors of liquid crystal molecules, 5CB, have been investigated in the thick cells having aligning layers of the polyimide (PI) Langmuir-Blodgett (LB) films on the aluminum electrodes using the attenuated total reflection (ATR) measurement method. The ATR curves strongly depended upon the AC voltages applied to the cell and upon temperatures. The resonant excitations of the surface plasmon polariton (SPP) were observed in the broad region of the incident angle in the ATR measurements. The tilt angles of the liquid crystal molecules were calculated by fitting the theoretical ATR curves to the experimental ones. The results showed that the ATR measurement method was very useful for evaluating the behaviors of liquid crystal molecules in thick cells.

    DOI: 10.1541/ieejfms1990.119.1_124

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  • Thermoluminescence properties of SrAl2O4:Eu sputtered films with long phosphorescence 査読

    Keizo Kato, Itaru Tsutai, Takuya Kamimura, Futao Kaneko, Kazunari Shinbo, Masatoshi Ohta, Takahiro Kawakami

    Journal of Luminescence   82 ( 3 )   213 - 220   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Science Publishers B.V.  

    SrAl2O4 activated with Eu, one of the long phosphorescent materials with high brightness, was deposited on Si substrates using an RF sputtering technique with facing targets. The as-deposited SrAl2O4:Eu films did not show any peaks in the X-ray diffraction spectra, and the photoluminescence (PL) was not observed. However, the X-ray diffraction peaks were observed after annealing, and a PL peak at about 520 nm was observed after annealing in a reducing H2 + Ar gas or an inert Ar gas. The composition and morphology of the sputtered films were observed using an energy dispersive spectrometer (EDS) and a scanning electron microscope (SEM). The thermoluminescence (TL) measurements were carried out, and decay times of the phosphorescence and the activation energies were obtained from the peak temperature. TL spectra in higher temperature region which contribute for the long phosphorescence, were examined by the partial heating technique to evaluate the distributed trap depths and the lifetimes.

    DOI: 10.1016/S0022-2313(99)00036-8

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  • Detection of surface-plasmon evanescent fields using a metallic probe tip covered with fluorescence 査読

    T. Wakamatsu, T. Nakano, K. Shinbo, K. Kato, F. Kaneko

    Review of Scientific Instruments   70 ( 10 )   3962 - 3966   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Institute of Physics Inc.  

    A new experimental system has been constructed to detect evanescent fields of metal surface plasmons (SPs) using a metallic probe tip covered with fluorescence cadmium sulfide (CdS). The evanescent fields of the SPs sensitive to the metal interfaces were observed as fluorescent light from CdS on the tip. No additional lock-in detection technique with a vibrating probe tip is necessary in the system, in spite of the scattered light enhanced by SP due to the surface roughness. The fluorescent light measured for the Al film sample shows exponential decay with distance from the sample surface, indicating that the SP evanescent fields are detected with our apparatus. © 1999 American Institute of Physics.

    DOI: 10.1063/1.1150020

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  • Evaluation of surface roughness of metal thin films and Langmuir-Blodgett ultrathin films from scattered light due to surface plasmon polariton 査読

    Y Aoki, K Kato, K Shinbo, F Kaneko, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   327   127 - 130   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH SCI PUBL LTD  

    Scattered light properties from Ag thin films and arachidic acid (C20) Langmuir-Blodgett (LB) films on the Ag thin films were investigated to evaluate the surface roughnesses of these films utilizing the surface plasmon polariton (SPP) excited in the attenuated total reflection (ATR) configuration. The surface roughness of the films was estimated from the angular distribution of the scattered lights. This result was qualitatively corresponding to the evaluation by the atomic force microscope (AFM) measurements.

    DOI: 10.1080/10587259908026796

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  • Attenuated total reflection properties and complex dielectric constants in azobenzene LB films adsorbing cyanine dyes 査読

    T Fukami, F Kaneko, K Shinbo, T Wakamatsu, K Kato, S Kobayashi

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   327   103 - 106   1999年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH SCI PUBL LTD  

    Attenuated total reflection (ATR) properties have been investigated for azobenzene LB films adsorbing cyanine dyes on aluminum thin films. The ATR properties changed as the LB films were annealed. From the ATR properties, the complex dielectric constants were calculated as a uniaxial anisotropic dielectrics. It was thought that the ATR properties and the dielectric constants were caused by the dispersion properties due to the absorption bands.

    DOI: 10.1080/10587259908026790

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  • 銅フタロシアニンLB膜素子の構造とNO_2ガス電流応答特性 査読

    新保 一成, 竹石 剛, 近藤 祐介, 加藤 景三, 金子 双男, 小林 敏志

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   118 ( 12 )   1405 - 1411   1998年12月

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    記述言語:日本語   出版者・発行元:電気学会  

    DOI: 10.1541/ieejfms1990.118.12_1405

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  • Evaluation of Arachidic Acid Langmuir-Blodgett Ultrathin Films on Silver Thin Films from Scattered Light Using Surface Plasmon Polariton Excited at the Interfaces 査読

    Y.Aoki, K.Kato, K.Shinbo, F.Kaneko, T.Wakamatsu

    IEICE Transaction on Electronics   E81-C, 7   1098 - 1105   1998年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Evaluatin of Tilt Angles of Nematic Liquid Crystal Molecules on Polyimide Langmuir Blodgett Films using Attenuated Total Reflection Measurement Method 査読

    A.Baba, F.Kaneko, K.Shinbo, K.Kato, S.Kobayashi, T.Wakamatsu

    Jpn. J. Appl. Phys.   37, 5A   2581 - 2586   1998年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.37.2581

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  • Structures and electrical properties of arachidic acid Langmuir-Blodgett films with cyanine dyes prepared by applying bias voltages 査読

    K Kato, M Abe, K Obata, K Shinbo, F Kaneko, S Kobayashi

    THIN SOLID FILMS   331 ( 1-2 )   32 - 38   1998年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Arachidic acid (C20) Langmuir-Blodgett (LB) films with cyanine (Cy) dyes were fabricated by the diffusion-adsorption LB method with applying bias voltages V-d, and the structures and the electrical properties were investigated. From the absorption spectra, the amount and the orientation of the Cy dyes and the formation of the aggregates in the LB films were found to be controlled by V-d. The electrical properties were investigated from conduction current and thermally stimulated current (TSC) measurements. The current-voltage characteristics and: transient current properties showed the ionic hopping conduction. From the transient current properties. the sample deposited under negative V-d seemed to include larger amounts: of mobile ions and the mobile ions were supposed to be positive. The TSCs were also due to the ionic space charge polarization. The results in this work will be useful for the control of electrical properties in LB film devices. (C) 1998 Elsevier Science S,A. All rights reserved.

    DOI: 10.1016/S0040-6090(98)00942-0

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  • Evaluation of C<sub>15</sub>TCNQ Langmuir-Blodgett Ultrathin Films on Aluminum Thin Films by Attenuated Total Reflection Measurements 査読

    Keizo Kato, Yusuke Aoki, Kenichi Ohashi, Kazunari Shinbo, Futao Kaneko

    Japanese Journal Applied Physics   35 ( 10 )   5466 - 5470   1998年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1143/JJAP.35.5466

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  • SrAl_2O_4:Euスパッタ薄膜の作製と熱ルミネセンス特性 査読

    傳井 達, 上村 拓也, 加藤 景三, 金子 双男, 新保 一成, 太田 雅壽, 川上 貴浩

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   118 ( 9 )   1015 - 1020   1998年9月

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    記述言語:日本語   出版者・発行元:電気学会  

    DOI: 10.1541/ieejfms1990.118.9_1015

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  • Thermally stimulated currents and electrical conduction in self-assembled ultrathin films 査読

    K Shinbo, K Suzuki, K Kato, F Kaneko, S Kobayashi

    THIN SOLID FILMS   327   209 - 213   1998年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    Ultrathin films were formed from two types of non-conjugated polyelectrolytes, that is, polyallylamine (PAH) and polystyrensulfonate (PSS) using a self-assembly process and their electrical properties were investigated. Current versus voltage properties of the devices showed hopping conduction. The conduction was considered to be due to the migration of mobile ions in the sample, and that was also supported by temperature and humidity dependence of transient currents. Furthermore, thermally stimulated currents (TSCs) properties also suggested the ionic space charge polarization. Although the origin of mobile ions is not yet clear, the existence of sodium in the films was observed from the electron spectroscopy for the chemical analysis (ESCA). The humidity (i.e. water in the devices) also had a great influence on the electrical properties. The sodium ions and/or oxonium ions in the device are considered mobile ions. (C) 1998 Elsevier Science S.A. All rights reserved.

    DOI: 10.1016/S0040-6090(98)00630-0

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  • Evaluation of arachidic acid Langmuir-Blodgett ultrathin films on silver thin films from scattered light using surface plasmon polariton excited at the interfaces 査読

    Y Aoki, K Kato, K Shinbo, F Kaneko, T Wakamatsu

    IEICE TRANSACTIONS ON ELECTRONICS   E81C ( 7 )   1098 - 1105   1998年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    Attenuated total reflection (ATR) properties and scattered light properties were measured for Ag thin films and arachidic acid (C20) Langmuir-Blodgett (LB) ultrathin films on the Ag thin films to obtain the information about their complex dielectric constants and surface roughness utilizing an excited surface plasmon polariton. The complex dielectric constants for the Ag thin films and the C20 LB films were obtained by fitting the calculated ATR curves to the experimental ones. The surface roughnesses of these films were estimated by the angular distribution of the scattered light assuming the Gaussian function as an autocorrelation function and a linear superposition of roughness spectra. The angular spectra strongly depended on the roughness parameters: the transverse correlation length sigma and the surface corrugation depth delta. The experimental angular distributions were explained by some pairs of sigma and delta. It was suggested that the surface roughness of the C20 LB films changed with the number of monolayers since the angular spectra varied with the number of the C20 LB monolayers on the Ag films. It is thought that the measurement of the scattered light is useful to evaluate surface roughnesses of LB ultrathin films.

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  • 全反射減衰法によるシアニン色素吸着アゾベンゼンLB膜の光学特性と熱処理特性の評価 査読

    深海 徹夫, 金子 双男, 新保 一成, 加藤 景三, 小林 敏志, 若松 孝

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   118 ( 1 )   71 - 77   1998年1月

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  • Evaluation of liquid crystal molecules on polyimide LB films using attenuated total reflection measurement 査読

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi

    Thin Solid Films   327-329 ( 1-2 )   353 - 356   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

    Tilt angles of nematic liquid crystal molecules, 5CB, have been investigated in cells with rubbing-free aligning layers of polyimide Langmuir-Blodgett (LB) films on the aluminum electrodes using the attenuated total reflection (ATR) measurement. The ATR properties were evaluated from the surface plasmon polariton and the guided wave excitation modes when various DC voltages were applied to the cell. The tilt angles near the aligning layers of the polyimide (Pl) LB films and in the middle layer of the cell were calculated by fitting the theoretical ATR curves to the experimental ones. This technique is very useful for evaluating aligning properties of liquid crystal molecules on LB films in the cells.

    DOI: 10.1016/S0040-6090(98)00668-3

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  • Orientations of Liquid Crystal Molecules on Polyimide LB Films Evaluated by the Attenuated Total Reflection Measurement 査読

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi, Takashi Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   316   231 - 234   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:GORDON BREACH PUBLISHING, TAYLOR & FRANCIS GROUP  

    Tilt angles of liquid crystal molecules, 5CB, have been investigated in the liquid crystal cells with the polyimide (PI) LB alignment films on the aluminum electrodes using the attenuated total reflection (ATR) measurement. The ATR properties were evaluated from the surface plasmon polariton (SPP) and the guided wave excitation modes (GWEM) when various DC voltages were applied to the cell. The tilt angles of the liquid crystal molecules were calculated by fitting the theoretical ATR curves to the experimental ones using a three layers model. Furthermore, the electric field intensities in the cell were calculated at several incident angles.

    DOI: 10.1080/10587259808044498

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  • Scattered light due to excited surface plasmon in arachidic acid LB ultrathin films on silver thin films 査読

    Yusuke Aoki, Keizo Kato, Kazunari Shinbo, Futao Kaneko, Takashi Wakamatsu

    Thin Solid Films   327-329 ( 1-2 )   360 - 363   1998年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

    Scattered light due to exdted surface plasmon in arachidic add (C20) Langmuir-Blodgett (LB) ultrathin films on the silver (Ag) thin films was measured to obtain information about surface roughness of the films. The scattered light intensities were assumed to be described by a linear superposition of roughness spectra, and the experimental angular distributions were ex plained by some pairs of the transverse corraation length σ and the surface corrugation depth δ. The angular spectra strongly depended on the roughness parameters, σ and δ. The roughness parameters for the C20 LB films were decided by fitting the theoretical angular patterns to the experimental results. The angular spectra varied with the number of the C20 LB monolayerson the Ag films. It is suggested that the surface roughness of the C20 LB films changed with the number of monolayers. The scattered light method is useful for evaluating surf ace roughnesses of LB ultrathin films.

    DOI: 10.1016/S0040-6090(98)00670-1

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  • Temperature and voltage dependence of attenuated total reflection properties of liquid crystal molecules on the LB films 査読

    A Baba, F Kaneko, K Shinbo, T Wakamatsu, K Kato, S Kobayashi

    1998 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS, PROCEEDINGS   591 - 594   1998年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INSTITUTE ELECTRICAL ENGINEERS JAPAN  

    Behaviors of liquid crystal molecules, 5CB, have been investigated in the thick cells having aligning layers of the polyimide (PI) Langmuir-Blodgett (LB) films on the aluminum electrodes using the attenuated total reflection (ATR) measurement method. The ATR curves strongly depended upon the AC voltages applied to the cell and upon temperatures. The resonant excitations of the surface plasmon polariton (SPP) were observed in the broad region of the incident angle in the ATR measurements. The tilt angles of the liquid crystal molecules were calculated by fitting the theoretical ATR curves to the experimental ones. The results showed that the ATR measurement method was very useful for evaluating the behaviors of liquid crystal molecules in thick cells.

    DOI: 10.1109/ISEIM.1998.741812

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  • Thermoluminescence properties of SrAl2O4 : Eu sputtered films with long phosphorescence 査読

    Tsutai, I, T Kamimura, K Kato, F Kaneko, K Shinbo, M Ohta, T Kawakami

    1998 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS, PROCEEDINGS   51 - 54   1998年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:INSTITUTE ELECTRICAL ENGINEERS JAPAN  

    SrAl2O4 activated with Eu, one of new long phosphorescent materials with high brightness, was deposited on Si substrates using an RF sputtering technique with, facing targets. The photoluminescence (PL) was not observed for the as-deposited SrAl2O4:Eu films. However, a PL peak at about 520 nm was observed after annealing in a reducing H-2+Ar gas. The thermoluminescence (TL) measurements were carried out, and the Lifetimes of the phosphorescence were obtained from the peaks. TL spectra in higher temperature region which contribute for the long phosphorescence, were examined by the partial heating technique to evaluate the distributed trap depths and lifetimes. The results in this work are useful for the development of phosphors.

    DOI: 10.1109/ISEIM.1998.741682

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  • 全反射減衰法によるポリイミドLB配向膜上液晶層の評価 査読

    馬場 暁, 金子 双男, 新保 一成, 加藤 景三, 小林 敏志

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   117 ( 12 )   1233 - 1238   1997年12月

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  • 可視光レーザーを用いた全反射減衰法によるドナー性分子吸着 TCNQ LB膜の評価 査読

    大橋 健一, 新保 一成, 加藤 景三, 金子 双男

    レーザー研究   25 ( 1 )   72 - 76   1997年1月

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    記述言語:日本語   出版者・発行元:レ-ザ-学会  

    DOI: 10.2184/lsj.25.72

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  • Ionic conduction currents and TSCs in self-assembled monolayers 査読

    K Shinbo, K Suzuki, K Kato, F Kaneko, S Kobayashi

    PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1 AND 2   559 - 562   1997年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:I E E E  

    Ultrathin films were formed from two type non-conjugated polyelectrolytes, that is, polyallylamine (PAH) and polystyrensulfonate (PSS) using a self-assembly process. It was found that these self-assembled monolayers (SAMs) have excellent layered structure from their optical absorption spectrum. The films were deposited in solutions with various concentrations of the polymers and the condition for the stable deposition was obtained. Current vs. electric field properties of the devices showed the hopping conduction. The conduction was considered to be due to migration of mobile ions in the sample, that was also supported by temperature dependence of transient currents. Furthermore, thermally stimulated currents (TSCs) properties also suggested the ionic space charge polarization. Although the origin of the mobile ions an not clear yet, the existence of sodium in the films are observed from the electron spectroscopy for the chemical analysis (ESCA). The humidity, that is, water in the devices also has great influence on the electrical properties. The sodium ions and/or oxonium ions in the device are considered as mobile ions.

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  • Evaluation of structures in C(18)TCNQ Langmuir-Blodgett ultrathin films with and without adsorbed donors using attenuated total reflection method 査読

    K Kato, K Ohashi, Y Aoki, K Shinbo, F Kaneko, S Kobayashi

    PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1 AND 2   563 - 566   1997年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:I E E E  

    The structures are investigated using attenuated total reflection (ATR) method for octadecyl-7,7',8,8'-tetracyano-quinodimethane (C(18)TCNQ) Langmuir-Blodgett (LB) ultrathin films with and without adsorbed electronic donors of p-phenylenediamine (PD) and N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD). The thickness of the LB films are determined by the theoretical curve fitting to the ATR curves assuming the dielectric constant of the LB films. The obtained thickness of the LB films without adsorbed donors is much larger than the molecular length of C(18)TCNQ. This is thought to be caused by the formation of the bimolecular layers in the LB films. In contrast, the LB films with adsorbed donors have monomolecular layered structure.

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  • Attenuated total reflection properties and structures in squarylium LB films 査読

    F Kaneko, S Honda, T Fukami, K Kato, T Wakamatsu, K Shinbo, S Kobayashi

    THIN SOLID FILMS   284   417 - 419   1996年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA LAUSANNE  

    The attenuated total reflection (ATR) properties, as a function of the incident angle of the laser beam, were investigated for squarylium (SQ) Langmuir-Blodgett (LB) films on thin Ag layers. Photosensitive SQ dyes exhibit strong absorption in the visible. The ATR curves are strongly dependent on the number of LB monolayers; the resonant angles at the dips increase with increasing number of monolayers. The complex dielectric constants of the LB films (uniaxial anisotropic dielectrics) were determined by fitting the theoretical ATR curves to the experimental curves. The ATR properties suggest that the tilt angles of the long axes of the chromophores in the SQ molecules are about 10 degrees from the LB film plane for two layers and about 30 degrees for more than four layers, Since H aggregation of SQ molecules in LB films is generated on annealing and the absorption spectra change, the ATR properties were also investigated for annealed SQ LB films. The properties are of interest for optical applications.

    DOI: 10.1016/S0040-6090(95)08355-3

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  • Ionic conduction and photoisomerization in azobenzene Langmuir-Blodgett films adsorbing cyanine dyes 査読

    K Shinbo, T Kontani, M Watanabe, T Fukami, K Kato, F Kaneko, S Kobayashi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   35 ( 9A )   4765 - 4769   1996年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN J APPLIED PHYSICS  

    Azobenzene (At) Langmuir-Blodgett (LB) films adsorbing cyanine dyes (NK-3) were deposited and the electrical properties were investigated in detail. The current vs electric field characteristics suggested ionic hopping conduction, and the transient current properties showed current peaks due to migration of mobile ions. The thermally stimulated currents (TSCs) were also due to the ionic space charge polarization, that is, displacement of mobile ions over long distances in the LB films. These results indicated that the electrical properties of the Az LB devices are strongly dependent on the mobile ions in the devices. In addition, the TSC and the short-circuit photocurrent properties due to the dyes were also changed by isomerization of the Az molecules. The results showed that the ionic space charge polarization and the aggregates of the dyes were affected by the isomerization.

    DOI: 10.1143/JJAP.35.4765

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  • Attenuated total reflection properties and structures in spiropyran LB thin films 査読

    K Kato, H Saiki, H Okuchi, F Kaneko, T Wakamatsu, K Shinbo, S Kobayashi

    THIN SOLID FILMS   284   420 - 423   1996年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA LAUSANNE  

    Attenuated total reflection (ATR) properties and structures were investigated for spiropyran (SP) Langmuir-Blodgett (LB) thin films. The SP LB films were deposited in the dark onto the cover glass evaporated with AE, The mixture of SP, arachidic acid (C20) and octadecane (HC18) were used for the LB depositions. The ATR properties changed with the molar ratios of the mixtures, SP molecules were found to be better packed forming monolayers in the films with HC18 than without HC18. The ATR properties of the films with HC18 exhibited reversible changes caused by the isomerization, but the charge was small because of the small rate of the isomerization of SP molecules. This result also indicates that the samples with HC18 were compactly packed. The ATR properties also changed with the temperature of heat treatment for the SP LB films with SP and photomerocyanine (PMC) forms. The changes of the structures and the optical properties in the SP LB thin films could be evaluated from ATR measurements.

    DOI: 10.1016/S0040-6090(95)08356-1

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  • クリスタルバイオレット吸着アラキジン酸LB膜の光・電気特性 査読

    加藤 景三, 立山 敦之, 新保 一成, 金子 双男, 小林 敏志

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   116 ( 1 )   73 - 79   1996年1月

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    記述言語:日本語   出版者・発行元:電気学会  

    DOI: 10.1541/ieejfms1990.116.1_73

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  • スピロピランLB膜の超薄膜構造と全反射減衰法による評価 査読

    若松 孝, 大口 寿史, 齊木 仁, 新保 一成, 加藤 景三, 金子 双男

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   116 ( 1 )   55 - 61   1996年1月

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    Structure and optical properties for LB ultrathin films of spiropyran (SP) dyes have been investigated using the attenuated total reflection (ATR) method, which resonantly excites surface plasmon at an interface between metal and dielectrics. SP dyes change from SP to photomerocyanine (PMC) forms by UV irradiation, and visible irradiation or heat treatment causes the reverse change. The LB ultrathin films, which consisted of the mixtures of SP, arachidic acid (C20) and octadecane (HC 18), were deposited on Ag thin films in the dark. The ATR properties due to the change of the molar ratios of the mixtures were observed, and showed that the SP LB films containing HC18 had the highly ordered structure. The ATR for the SP LB films with HC18 exhibited the reversible changes by the photoisomerization. The structure and the optical properties of the SP LB films changed with the temperatures of the heat treatment, and the ATR properties corresponding to the heat treatment were also observed.

    DOI: 10.1541/ieejfms1990.116.1_55

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  • 全反射減衰法による金属薄膜上のアラキジン酸カドミウム塩LB超薄膜の構造評価 査読

    金子 双男, 本多 章作, 若松 孝, 新保 一成, 加藤 景三, 小林 敏志

    電気学会論文誌A(基礎・材料・共通部門誌)   115 ( 11 )   1137 - 1143   1995年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    Attenuated total reflection (ATR) properties have been investigated as a function of incident angles of visible laser beams for LB ultrathin films of arachidic cadmium salt on Ag and Al thin films. The ATR properties are measured for the LB ultrathin films with different numbers of the monolayers. The resonance angles for both the LB films on Ag and Al films strongly depend upon the number of the monolayers. The calculated ATR curves fit the experimental ones, assuming that the complex dielectric constants are isotropic and constant for all LB films. The thicknesses of the LB monolayers are decided from the theoretical curves. The result shows that the deposition of the LB films on Al films is better than the one on Ag films. The ATR measurement has not been reported for LB films on Al films until now. It is thought that the ATR measurement for LB films on Al films is very useful because most LB films are easily deposited on Al thin films.

    DOI: 10.1541/ieejfms1990.115.11_1137

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  • ADSORPTION OF CYANINE DYES AND OPTICAL-PROPERTIES OF PHOSPHATIDIC-ACID LANGMUIR MONOLAYERS AND LANGMUIR-BLODGETT-FILMS 査読

    K SHINBO, F KANEKO, S KOBAYASHI

    THIN SOLID FILMS   243 ( 1-2 )   630 - 633   1994年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA  

    The optical properties and the aggregate structure are investigated for phosphatidic acid (PA) Langmuir films adsorbing cyanine dyes from the aqueous solution to the air-water interface and for PA Langmuir-Blodgett (LB) films containing the dyes on glass substrates. H* aggregation of the dyes oriented perpendicularly to the water surface is observed for the PA Langmuir films for subphases at pH 5. The H* aggregate, however, is not observed after the LB films are deposited onto the substrates, and J aggregates appear instead. Aggregate properties of the dyes in the PA Langmuir films and the LB films depend on the pH of the subphase and are different from those of the dyes adsorbed in arachidic acid (C20) films. Furthermore, absorption peaks of the aggregate models, calculated using the extended dipole model, coincide with the experimental absorption spectra. The properties are of great interest for controlling the characteristics of LB films adsorbing dyes and fabricating LB devices.

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  • ORDERED STRUCTURE AND ELECTRICAL-PROPERTIES IN SPIROPYRAN LANGMUIR-BLODGETT-FILMS 査読

    K KATO, K SHINBO, M SUZUKI, F KANEKO, S KOBAYASHI

    THIN SOLID FILMS   243 ( 1-2 )   480 - 483   1994年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA LAUSANNE  

    Electrical properties for Langmuir-Blodgett (LB) films of spiropyran (SP) dyes (SP98 and SP1822) and their structure are investigated. SP dyes change from SP to photomerocyanine (PMC) forms as a result of UV irradiation. The UV-irradiated SP dyes change from PMC to SP forms again by visible irradiation or heat treatment. Thermally stimulated current (TSC) measurements are used to examine the electrical properties of the SP LB films. The TSC for the SP LB films is found to be due to the dipolar depolarization. The TSC of the SP98 LB films strongly depends on their structure, and exhibits reversible changes caused by the isomerization. The TSC for the SP1822 LB films, however, does not change clearly as a result of the isomerization. The TSC due to the dipolar depolarization is thought to depend on how the molecules are packed in the LB films. The microscopic behaviour of the molecule may be influenced by its surrounding space.

    DOI: 10.1016/0040-6090(93)04084-6

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  • STRUCTURE AND ELECTRICAL-PROPERTIES OF PHOSPHATIDIC-ACID LANGMUIR-BLODGETT-FILMS ADSORBING CYANINE DYES 査読

    F KANEKO, K SHINBO, Y KOBAYASHI, K KATO, S KOBAYASHI

    THIN SOLID FILMS   243 ( 1-2 )   489 - 492   1994年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE SA LAUSANNE  

    The structure and electrical properties of phosphatidic acid (PA) Langmuir-Blodgett (LB) films adsorbing cyanine dyes (NK-3) with sandwich electrodes are investigated. PA LB monolayers adsorbing the dyes and the monolayers of Cd salt without the dyes are deposited using the subphases, containing various concentrations of the dyes and containing CdCl2 instead of the dyes respectively. Thermally stimulated current (TSC) measurements are used to examine the dipolar polarizations in the PA LB films, in the temperature region between 100 and 300 K. A marked increase in TSCs is observed above 180 K and especially above 250 K for the devices containing the dyes. The TSCs are caused by the dipolar polarizations, and the TSCs increase with increasing quantity of the dyes contained in the LB devices. Conduction currents are also measured at room temperature for the PA LB film devides. Increases in the conduction currents are also observed in the LB films containing the dyes. Furthermore, the conduction currents markedly increase when using the upper Au electrode. The current I vs. voltage V properties nearly follow the Schottky-type relation log I is-proportional-to V 1/2 . However, the conduction currents are very complicated, and this is thought to be due to composite mechanisms in the film and at the interface. The results are useful for applications of ultrathin film devices in the future.

    DOI: 10.1016/0040-6090(93)04217-G

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  • Anomalous conduction currents and TSCs in LB films adsorbing dyes 査読

    F KANEKO, M WATANABE, S ITO, K SHINBO, K KATO, S KOBAYASHI

    PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON PROPERTIES AND APPLICATIONS OF DIELECTRIC MATERIALS, VOLS 1 AND 2   201 - 204   1994年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:I E E E  

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  • 有機分子の微視的挙動を用いた超薄膜デバイス -メモリーおよびセンサの提案- 査読

    金子双男, 新保一成, 山下 建, 加藤景三, 加藤 智, 小 豊, 鈴木 勝, 小林敏志

    電気学会論文誌A   113 ( 11 )   762 - 768   1993年11月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejfms1990.113.11_762

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  • NUCLEATE POOL BOILING HEAT-TRANSFER OF MAGNETIC FLUID IN A MAGNETIC-FIELD 査読

    M TAKAHASHI, K SHINBO, R OHKAWA, M MATSUZAKI, A INOUE

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   122 ( 1-3 )   301 - 304   1993年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Saturated pool boiling heat transfer of toluene-solvent magnetic fluid on a horizontal surface was investigated in the vertically linear profile of a magnetic field. The heat transfer is enhanced for a dilute fluid or under a high field gradient, while being reduced for a dense fluid at high heat flux under a low field gradient.

    DOI: 10.1016/0304-8853(93)91096-P

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  • Fabrication of a quartz-crystal microbalance/surface-plasmon-resonance hybrid sensor and taking advantage of their responses for evaluation of thin films and liquids 招待

    Kazunari Shinbo, Chutiparn Lertvachirapaiboon, Yasuo Ohdaira, Akira Baba, Keizo Kato

    AM-FPD 2019 - 26th International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, Proceedings   2019年7月

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    担当区分:筆頭著者, 責任著者  

    © 2019 FTFMD. Hybrid sensors of quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) were prepared, and the film depositions, vapor sorptions to polymer films, and liquid properties were observed. The relationship between the SPR wavelength and QCM frequency shifts depends on both the refractive index and the density of the adsorbed molecule and would give information for identification. Furthermore, the swelling of the film can be monitored using the different laws of nature in the SPR and QCM methods.

    DOI: 10.23919/AM-FPD.2019.8830578

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  • Detection of human immunoglobulin G by transmission surface plasmon resonance using the in situ gold nanoparticle growth method

    Theerasak Juagwon, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Toemsak Srikhirin, Tanakorn Osotchan, Akira Baba

    IEICE Transactions on Electronics   E102C ( 2 )   125 - 131   2019年2月

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    Copyright © 2019 The Institute of Electronics, Information and Communication Engineers. In this work, we report the in situ growth of gold nanoparticles (AuNPs) for the improvement of a transmission surface plasmon resonance (T-SPR) sensor to detect human immunoglobulin G (IgG). Human IgG was immobilized on an activated self-assembled monolayer of 11-mercaptoundecanoic on a gold-coated grating substrate. The T-SPR system was also used to monitor the construction of sensor chips as well as the binding of IgG and anti-IgG conjugated with AuNPs. After specific adsorption with IgG, the T-SPR signal was further enhanced by the in situ growth of AuNPs bound with anti-IgG. Using AuNP conjugation and in situ growth of bound AuNPs, the sensitivity of the IgG immunosensor was improved by two orders of magnitude compared with that without conjugated AuNPs.

    DOI: 10.1587/transele.2018OMP0004

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  • 新潟支所の最近の活動

    新保 一成

    電気学会誌   138 ( 5 )   298 - 298   2018年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    <p>新潟支所は1980年(昭和55年)に開設され,40年近くの歴史となる。これは,東京支部にある九つの支所のうち,茨城支所に次いで2番目に古いものである。対象地域は新</p>

    DOI: 10.1541/ieejjournal.138.298

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  • 金属グレーティング上有機薄膜の表面プラズモン透過光と高感度センサ応用 (有機エレクトロニクス)

    加藤 景三, ラートバチラパイボーン チュティパーン, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 334 )   59 - 64   2017年12月

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  • 光導波路型表面プラズモン共鳴および水晶振動子微量天秤法を用いた複合型吸着センサ (誘電・絶縁材料研究会・有機薄膜,有機・バイオデバイス,一般)

    新保 一成, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI   2017 ( 72 )   37 - 40   2017年7月

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  • 光導波路型表面プラズモン共鳴センサによる湿度・アンモニアガスセンシング (誘電・絶縁材料 電子材料合同研究会 ナノ構造制御有機薄膜・デバイス,フレキシブルデバイス,バイオエレクトロニクス)

    新保 一成, 駒井 稜, 本多 浩気, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI   2017 ( 63 )   17 - 20   2017年6月

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  • 複合プラズモニック構造有機太陽電池の作製と評価 (有機エレクトロニクス) -- (材料デバイスサマーミーティング)

    馬場 暁, ラートバチラパイボーン チュティパーン, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 93 )   29 - 32   2017年6月

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  • 多検体同時検出型電気化学 : 表面プラズモン共鳴バイオセンサ (特集 光が担う健康の管理と増進)

    馬場 暁, Lertvachirapaiboon Chutiparn, 新保 一成, 加藤 景三, 金子 双男

    光アライアンス   28 ( 5 )   16 - 20   2017年5月

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    記述言語:日本語   出版者・発行元:日本工業出版  

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  • プラズモン励起を利用した金属/有機薄膜構造の作製と評価 (誘電・絶縁材料研究会・次世代エレクトロニクスのための界面評価と制御技術)

    馬場 暁, ラートバチラパイボーン チュティパーン, 新保 一成, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI   2017 ( 14 )   11 - 14   2017年2月

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  • 招待講演 表面プラズモン励起を利用した高機能・高性能有機センサ (有機エレクトロニクス)

    加藤 景三, ラートバチラパイボーン チュティパーン, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 392 )   41 - 46   2017年1月

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  • 金量子ドット-金微粒子複合有機太陽電池の作製と評価 (誘電・絶縁材料研究会・有機材料・薄膜・デバイス一般)

    馬場 暁, ペットサン ソピット, パングダム アピチャット, ラートバチラパイボーン チュティパーン, ウンヌンカド コンタッド, 新保 一成, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI   2017 ( 1 )   19 - 22   2017年1月

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  • 金量子ドット-金微粒子複合有機太陽電池の作製と評価 (有機エレクトロニクス)

    馬場 暁, ペットサン ソピット, パングダム アピチャット, ラートバチラパイボーン チュティパーン, ウンヌンカド コンタッド, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 392 )   19 - 22   2017年1月

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  • 招待講演 表面プラズモン励起を利用した高機能・高性能有機センサ (誘電・絶縁材料研究会・有機材料・薄膜・デバイス一般)

    加藤 景三, ラートバチラパイボーン チュティパーン, 馬場 暁, 新保 一成, 金子 双男

    電気学会研究会資料. DEI   2017 ( 1 )   41 - 46   2017年1月

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  • 希釈水素ガス雰囲気中におけるPd超薄膜を堆積したフタロシアニンマグネシウム薄膜の特性 (電子部品・材料)

    清水 英彦, 新保 一成, 岩野 春男, 川上 貴浩, 福嶋 康夫, 永田 向太郎

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 311 )   49 - 53   2016年11月

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  • グレーティングカップリング長距離伝搬表面プラズモン励起透過光特性とセンサ応用

    新保 一成, 中條 博史, 小幡 尚希, チュティパーン ラートバチラパイボーン, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI   2016 ( 71 )   31 - 34   2016年7月

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  • グレーティングカップリング長距離伝搬表面プラズモン励起透過光特性とセンサ応用 (有機エレクトロニクス)

    新保 一成, 中條 博史, 小幡 尚希, チュティパーン ラートバチラパイボーン, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 134 )   31 - 34   2016年7月

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  • 若手研究者の挑戦(第5回)表面プラズモン共鳴励起を利用したセンサー・デバイス応用

    馬場 暁, 新保 一成, 加藤 景三

    Optronics : 光技術コーディネートジャーナル   35 ( 1 )   166 - 170   2016年1月

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    記述言語:日本語   出版者・発行元:オプトロニクス社  

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  • C-13-1 グレーティングカップリング長距離伝搬表面プラズモン励起と透過光特性(C-13.有機エレクトロニクス,一般セッション)

    瀧澤 紘大, 小幡 尚希, 新保 一成, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2015 ( 2 )   74 - 74   2015年8月

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  • 斜め蒸着法によるキャリア発生型有機電界効果トランジスタのオンオフ比改善 (有機エレクトロニクス)

    田村 英継, 新保 一成, 馬場 暁

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 163 )   29 - 32   2015年7月

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  • 光導波路分光法を用いた電解質交互吸着膜の堆積その場観察 (有機エレクトロニクス)

    新保 一成, 石郷岡 誠, 大平 泰生

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 68 )   11 - 14   2015年5月

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  • 金属ナノ構造制御プラズモニック有機太陽電池の作製と評価 (有機エレクトロニクス)

    馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 516 )   17 - 20   2015年3月

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    金属格子を用いたグレーティングカップリング表面プラズモン共鳴法では、金属で覆われたグレーティング基板上に入射した光の波数にグレーティングベクトルが足し合わさることによりプラズモンの波数と一致して表面プラズモンを共鳴励起する方法であり、プリズムを必要としないことなどから実用的なデバイスへの応用が検討されてきている。我々は金属格子上での表面プラズモン共鳴励起を利用した有機太陽電池への応用や、異常透過を利用したセンサー応用への検討も行ってきている。最近、金属格子上に金属微粒子を配置することにより伝搬型プラズモンと局在表面プラズモンを同時に励起することで、さらなる電界の増強が得られることを示し、光電変換デバイス等への応用に有用であることを示してきた。本報告では、主にナノインプリンティング法を用いた金属ナノ構造制御プラズモニック有機太陽電池ついて報告する。

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  • CS-4-2 表面プラズモン共鳴を利用した高性能有機センサの開発(CS-4.有機エレクトロニクス材料・デバイスの過去・現在と未来への展望,シンポジウムセッション)

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会総合大会講演論文集   2015 ( 2 )   "S - 16"-"S-17"   2015年2月

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  • 研究グループ紹介:新潟大学 超域学術院ナノ構造制御による高機能化・新機能創製と革新的電子デバイスへの応用研究グループ

    新保 一成

    電気学会論文誌A(基礎・材料・共通部門誌)   135 ( 10 )   NL10_1 - NL10_1   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人 電気学会  

    DOI: 10.1541/ieejfms.135.NL10_1

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  • CS-2-4 表面プラズモン共鳴分光法を利用した複合センサによる電解質交互吸着膜の堆積その場評価(CS-2.機能性有機材料と有機電子・光デバイスの最近の進展,シンポジウムセッション)

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2014 ( 2 )   "S - 6"-"S-7"   2014年9月

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  • CS-2-5 複合プラズモニック構造導入光電変換デバイスの作製と評価(CS-2.機能性有機材料と有機電子・光デバイスの最近の進展,シンポジウムセッション)

    馬場 暁, ノートチャナット スペーラ, エクガシット サノン, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2014 ( 2 )   "S - 8"-"S-9"   2014年9月

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  • 水晶振動子・表面プラズモン共鳴複合センサによる電解質交互吸着膜の堆積その場評価 (電子部品・材料 材料デバイスサマーミーティング)

    新保 一成, 河内 啓介, 廣上 昌洋, 大平 泰正, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 95 )   17 - 20   2014年6月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    あらましATカット水晶基板を光導波路として用い、電極上で表面プラズモン(SP)を励起することにより、水晶振動子(QCM)と表面プラズモン共鳴(SPR)の複合センサを構築した。これによりポリアリルアミン(PAH)とポリスチレンスルホン酸(PSS)水溶液による交互吸着膜の堆積過程のその場評価を行った。SPR特性から得られた堆積膜厚は、QCM特性から得られたものに比べて小さくなる傾向があり、特にpHが低い場合に顕著になった。これは、低pHではPAHのアミノ基が電離してポリマー鎖間のクーロン反発力が増し、薄膜が膨潤して膜中に水分が含まれQCMで検出されたためと考えられた。

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  • 招待講演 ナノ構造制御有機薄膜の表面プラズモン共鳴励起と高性能デバイス・センサへの応用 (有機エレクトロニクス)

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 461 )   23 - 28   2014年3月

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    高性能な有機デバイス・センサの開発に向けて有機薄膜が盛んに研究されている.筆者らは,これまでに表面プラズモン共鳴(SPR)によるナノ構造制御有機薄膜の評価とデバイス・センサ応用に関して種々の研究を行ってきた.本論文では,SPRを利用した高性能有機デバイス・センサについて報告する.すなわち,クレーディングカップリングSPRを用いた有機太陽電池,光導波路(OWG)分光法とSPRを用いた複合センサ,透過型SPRセンサ,ロングレンジSPRを利用したバイオセンサについて,最近の研究成果について報告する.

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  • C-13-1 金属微粒子分散酸化チタン膜上グレーティング構造固体電解質を利用した表面プラズモン共鳴増強色素増感太陽電池の作製と評価(C-13.有機エレクトロニクス,一般セッション)

    原 一馬, Ninsonti Hathaithip, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会総合大会講演論文集   2014 ( 2 )   118 - 118   2014年3月

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  • CS-2-4 エレクトロスピニング法によるナノファイバーの作製とロングレンジ表面プラズモン共鳴バイオセンサーへの応用(CS-2.界面におけるナノバイオテクノロジー,シンポジウムセッション)

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2013 ( 2 )   "S - 5"-"S-6"   2013年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 光導波路分光法を用いた溶液中における有機薄膜の堆積その場評価 (有機エレクトロニクス)

    新保 一成, 平川 諒, 澁市 真吾

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 115 )   5 - 8   2013年7月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • キャリア発生層挿入ペンタセン電界効果トランジスタの構造と特性評価 (有機エレクトロニクス)

    薄葉 俊, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男, 皆川 正寛

    電子情報通信学会技術研究報告 : 信学技報   112 ( 469 )   9 - 12   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    有機電界発光素子において報告されているキャリア発生層を、有機電界効果トランジスタに適用した。ペンタセン薄膜トランジスタに五酸化バナジウム(V_2O_5)を材料とするキャリア発生層を挿入したところ、挿入無しの場合に比べ約2.5倍のトレイン電流が観測された。またペンタセンとV2O5の共蒸着層を挿入したところ、さらに倍程度の電流となり大きな効果が確認された。このような電流増加にはペンタセンとV_2O_5の電荷移動(CT)錯体の形成が関与していると考えられ、共蒸着層ではCT錯体の形成が顕著になったためと考えられた。

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  • CS-4-9 表面プラズモン共鳴・光導波路分光法複合センサを用いた有機色素薄膜の堆積評価(CS-4.有機エレクトロニクスデバイス作製・評価技術の最新動向と今後の展望)

    新保 一成, 押鐘 太希, 横山 信司, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会総合大会講演論文集   2013 ( 2 )   "S - 27"-"S-28"   2013年3月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • C-13-10 光導波路分光・水晶振動子複合センサによる鉛フタロシアニン蒸着膜の堆積評価(C-13.有機エレクトロニクス)

    鵜野 成博, 平川 諒, 大平 泰生, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会総合大会講演論文集   2013 ( 2 )   153 - 153   2013年3月

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  • 表面プラズモン・光導波路分光複合センサによる薄膜堆積評価

    加藤 景三, 横山 信司, 押鐘 太希, 新保 一成, 馬場 暁, 金子 双男

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2013 ( 1 )   21 - 24   2013年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • 導電性高分子薄膜を用いた透過型表面プラズモン共鳴特性制御

    深谷 樹斗, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   112 ( 244 )   27 - 30   2012年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年、表面プラズモン共鳴法(SPR)は高感度なセンシングが可能であることから、バイオセンサーへの応用が注目されている。また最近になり、透過型表面プラズモン共鳴(T-SPR)法による表面プラズモン異常透過光が観測されており、そのセンサーへの応用の可能性が検討されている。本研究では導電性高分子のドーピング・脱ドーピングによる電気特性、光学特性の変化を利用したT-SPRの制御を行うと共に金微粒子による電場増強を利用したT-SPRのシグナル増強を行った。

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  • C-13-4 HAT-CNキャリア発生層を挿入した有機FET作製と特性評価(C-13.有機エレクトロニクス,一般セッション)

    後藤 貴俊, 皆川 正寛, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2012 ( 2 )   123 - 123   2012年8月

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  • C-13-2 水中で安定なPAAファイバーの作製とロングレンジ表面プラズモン共鳴法によるバイオセンサへの応用(C-13.有機エレクトロニクス,一般セッション)

    三宮 拓, 馬場 暁, Netsuwan Paphawadee, Sriwichai Saengrawee, 新保 一成, 加藤 景三, 金子 双男, Phanichphant Sukon

    電子情報通信学会ソサイエティ大会講演論文集   2012 ( 2 )   121 - 121   2012年8月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • エレクトロスピニング法によるナノファイバーの作製と電子デバイスへの応用

    金子 双男, 馬場 暁, 新保 一成, 加藤 景三

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   112 ( 139 )   33 - 36   2012年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    エレクトロスピニング法によるナノファイバーの作製において、キャピラリー内に銅線電極を配置することで、ポリマー溶液に圧力を加える必要のないエレクトロスピニング装置を開発した。本方法によって少ない溶媒で径の小さいナノファイバーが作製できた。金微粒子を含むカルバゾール前駆体ファイバーをエレクトロスピニング法で堆積し、その後に電解液中で電解重合やドーピングを行い、この処理によって発光特性を変えることができることを示した。さらに、金微粒子の添加量によっても発光特性を変えることができた。ナノファーバーは表面積が大きく高感度なセンシングが期待できることから、エレクトロスピニング法で堆積したナノファイバーを用いて長距離伝搬表面プラズモン・バイオセンサーを作製し、ヒト免疫グロブリンGの検出を試みたので報告する。

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  • 表面プラズモン励起を利用した有機太陽電池 (特集 有機系太陽電池が動き出す) 招待

    馬場 暁, 新保 一成, 加藤 景三

    ディスプレイ   18 ( 7 )   15 - 20   2012年7月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)   出版者・発行元:テクノタイムズ社  

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  • 金属格子上に配置した銀微粒子による表面プラズモン共鳴と距離依存特性

    ラートバチラパイボーン チュティパーン, 馬場 暁, エクガシット サノン, タマチャロエン チュチャート, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   112 ( 57 )   59 - 62   2012年5月

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    記述言語:英語   出版者・発行元:一般社団法人電子情報通信学会  

    近年、金属ナノホールアレイや金属格子により観測されている表面プラズモン共鳴異常透過現象は、ある波長のみ選択的に光が透過できることからさ様々な応用が期待されている。我々は、最近金属格子を利用したこの透過型表面プラズモン共鳴法(T-SPR)を用いたバイオセンサーへの応用を報告してきた。今回我々は、銀微粒子を金属格子上に配置することにより、T-SPR信号を増幅させることができたので報告する。金属格子表面からの銀微粒子の配置距離を変化させることにより、T-SPR信号の増幅度の違いが観測された。高分子電解質を用いた交互吸着法により、ナノメートルオーダーでの配置距離の制御を行った。

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  • CS-5-4 導電性高分子薄膜を用いた透過型表面プラズモン共鳴特性の制御とセンシング応用(CS-5.有機分子の特性を活かした材料評価技術とセンシング技術,シンポジウムセッション)

    馬場 暁, 多田 幸司, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会総合大会講演論文集   2012 ( 2 )   "S - 19"-"S-20"   2012年3月

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  • 多チャンネル表面プラズモン導波路センサの作製とガスセンシング

    高橋 勇人, 水澤 謙太, 新保 一成, 馬場 暁, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2012 ( 1 )   29 - 33   2012年1月

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    記述言語:日本語   出版者・発行元:電子情報通信学会  

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  • エバネッセント波と表面プラズモン共鳴を利用した有機デバイス・センサ

    加藤 景三, 馬場 暁, 新保 一成, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   111 ( 236 )   1 - 6   2011年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    有機デバイスやセンサは,フレキシブルで,費用効率が高く,大量生産が容易であることなどから,最近,それらの開発のために,有機エレクトロニクスとフォトニクスに関する研究が数多く行われている.特に,有機電界効果トランジスタ,有機発光ダイオード,有機太陽電池,バイオセンサが大変活発に研究されてきている.金属と誘電体界面での表面プラズモン(SP)励起によるエバネッセント波や表面プラズモン共鳴(SPR)は,誘電体超薄膜の評価や有機デバイス・センサへの応用に非常に有用である.本論文では,エバネッセント波やSPRを利用した有機デバイス・センサに関する最近の研究成果について報告する.

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  • 透過型表面プラズモン共鳴分光/マイクロ流体デバイスの作製とバイオセンサーへの応用

    加藤 竜太, 大関 隆夫, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男, シェパード ギャレス, ロックリン ジェイソン

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   111 ( 236 )   9 - 13   2011年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年、表面プラズモン共鳴法(SPR)は高感度なセンシングが可能であることから、バイオセンサーへの応用が注目されている。表面プラズモン(SP)を共鳴励起させるために、プリズムを用いたプリズムカップリングSPR法やグレーティング基板を用いたグレーティングカップリングSPR(G-SPR)法がある。また近年、G-SPRを用いたSP異常透過光が観測されおり、そのセンサーへの応用の可能性が検討されている。本研究では、簡便性と実用性という点からこのT-SPRに注目し、T-SPRとマイクロ流体デバイスと組み合わせることで今までになかった簡便でコンパクトなバイオセンサーを作製した。そこで、IgGとanti-IgGの抗原抗体反応を行うことでこのデバイスのバイオセンサーへの有用性を示した。

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  • CS-4-3 光導波路分光・水晶振動子複合センサを用いた有機薄膜の堆積評価(CS-4.有機半導体の物性とデバイス応用および今後の展開,シンポジウムセッション)

    新保 一成, 鵜野 成博, 石川 寛, 黒澤 英二, 横山 信司, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会ソサイエティ大会講演論文集   2011 ( 2 )   "S - 10"-"S-11"   2011年8月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 水晶振動子微量天秤・導波路型表面プラズモン共鳴複合法による薄膜堆積評価と蒸気センシング

    石川 寛, 大平 泰生, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2011 ( 54 )   45 - 48   2011年7月

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  • グレーティングカップリング表面プラズモン共鳴を利用した色素増感太陽電池の光電変換特性向上

    馬場 暁, 若月 慶介, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   111 ( 73 )   35 - 38   2011年5月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    ある条件の下で,金属薄膜に光を入射すると金属表面にプラズモンが共鳴励起され,電場を数十倍に増幅することが可能となる。グレーティングカップリング表面プラズモン共鳴法はプリズムが不必要な方法である。この方法では,金属で覆われたグレーティング面に光を入射することでSPを共鳴励起することができる。このようなことから、実際に実用化が考えられている色素増感太陽電池の電極構造を格子上に作製するだけで表面プラズモンを電極表面に共鳴励起することも可能である。本研究では,グレーティングカップリング表面プラズモン共鳴法によって共鳴励起されるSPの増強エネルギーを色素増感太陽電池に応用するために、デバイスの作製・評価を行った。

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  • 透過型グレーティングカップリング表面プラズモン共鳴特性の評価

    多田 幸司, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電気学会研究会資料. EFM, 電子材料研究会   2010 ( 1 )   27 - 32   2010年5月

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  • 白色光照射グレーティングカップリング表面プラズモン共鳴法のセンサー応用

    山崎 亮輔, 浅木 信吾, 馬場 暁, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, サマンタ サチャ, ロッタリン ジェイソン

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   110 ( 59 )   21 - 25   2010年5月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    グレーティングカップリング表面プラズモン共鳴法は、金属で覆われたグレーティング基板上に入射した光の波数にグレーティングベクトルが足し合わさることによりプラズモンの波数と一致して表面プラズモンを共鳴励起する方法であり、プリズムを必要としないことなどから、実用的なセンサーへの応用が検討されてきている。我々は、金属格子上での白色光照射多重励起型表面プラズモン共鳴現象を利用したセンサーへの応用を行ってきている。また、可視域で大きなエレクトロクロミズムを持つPEDOT-PSS/テルピリジン鉄錯体ポリマーを用いて、センシング感度の向上を試みている。今回、格子間隔の異なるグレーティングを用いてセンシングを行い比較・検討を行ったので報告する。

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  • 有機薄膜および複合膜の評価技術とデバイス応用の最近の進展 招待

    加藤 景三, 新保 一成, 岡本 徹志, 青木 裕介, 家地 洋之

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society   130 ( 2 )   129 - 135   2010年2月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)   出版者・発行元:一般社団法人 電気学会  

    Evaluation techniques and the device applications of organic and composite thin films are described. One of the evaluation techniques is the surface plasmon resonance (SPR) spectroscopy. It has become a widely accepted method for the characterization and study of ultrathin films, interfaces and kinetic processes at surfaces, and it has been investigated in the applications of SPR sensors and plasmonic novel devices. Properties, functionalization and various applications of hybrid materials, nanocomposites, and nanoparticles are also introduced, and the application to industry is mentioned. Moreover, electronic device application of monolithic organic logic circuit using a stacked structure of two organic static induction transistors is explained. The advantages of this novel device structure are the controllability of the operational characteristics and simple device fabrication process.

    DOI: 10.1541/ieejfms.130.129

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  • P-14 教育GP「つもり学習からの脱却」((08)工学教育に関するGood Practice,ポスター発表論文):: 電気・電子系におけるデザイン教育の実施事例

    大平 泰生, 村松 正吾, 新保 一成, 福井 聡, 鈴木 孝昌

    工学・工業教育研究講演会講演論文集   2010 ( 0 )   684 - 685   2010年

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    記述言語:日本語   出版者・発行元:公益社団法人 日本工学教育協会  

    DOI: 10.20549/jseejaarc.2010.0_684

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  • CS-6-3 金属格子上白色光照射表面プラズモン共鳴法を用いたセンサー応用(CS-6.環境・バイオに関わるセンシング材料とデバイス,シンポジウムセッション)

    馬場 暁, 山崎 亮輔, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, サマンタ サチャ, ロックリン ジェイソン

    電子情報通信学会ソサイエティ大会講演論文集   2009 ( 2 )   "S - 22"-"S-23"   2009年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 平成20年度リフレッシュ理科教室 : (北陸・信越支部新潟会場)開催報告

    大河 正志, 鈴木 孝昌, 坪井 望, 新保 一成, 大平 泰生, 馬場 暁, 岩野 春男, 丸山 武男

    応用物理教育   33 ( 1 )   35 - 38   2009年7月

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  • 交互吸着法による有機色素-カーボンナノチューブ複合超薄膜の作製と評価

    松沢 泰平, 馬場 暁, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   109 ( 147 )   1 - 4   2009年7月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    カーボンナノチューブ(CNT)はその導電性や半導体的特性などから、近年様々な分野で応用されているが、表面を化学的な手法等により修飾していない状態ではほとんどの溶媒に対して不溶性であるため、簡便な方法で薄膜化するのが困難であった。本研究では、カーボンナノチューブを水溶性有機色素分子をπ-π相互作用により吸着させることで水溶性とし、交互吸着法により複合薄膜の作製・評価を試みた。プラスの電荷を持つポルフィリン(TMPyP)水溶液とカーボンナノチューブを混ぜた複合分散水溶液の発光特性、マイナスの電荷を持つ銅クロロフィンナトリウム(SCC)水溶液とカーボンナノチューブを混ぜた両方の場合においてカーボンナノチューブを可溶化させる事により発光の減少が確認された。

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  • 五酸化バナジウム/銅フタロシアニン薄膜トランジスタの作製と特性評価

    新保 一成, 皆川 正寛, 東川 哲之, 北村 翔平, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   109 ( 48 )   45 - 48   2009年5月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    近年、五酸化バナジウム(V_2O_5)が有機電界発光素子において電荷発生層として機能することが報告されている。我々は、このような電荷発生層を有機トランジスタに適用することを試みている。本研究では、V_2O_5層と有機層(銅フタロシアニン:CuPc)の界面における相互作用を強めることを目的に、V_2O_5とCuPcの界面に混合層を設けた素子を作製した。混合層を厚さ20nmまで種々変えて作製したところ、混合層の膜厚と共に移動度が大きくなる様子が観察された。混合層の厚さが大きくなるにつれて、V_2O_5からの正孔注入が増大するためと推定された。

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  • グレーティングカップリング多重励起型表面プラズモン共鳴センサー

    馬場 暁, 山崎 亮輔, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, サマンタ サチャ, ロックリン ジェイソン

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   108 ( 469 )   7 - 11   2009年2月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    グレーティングカップリング表面プラズモン共鳴法は、金属で覆われたグレーティング基板上に入射した光の波数にグレーティングベクトルが足し合わさることによりプラズモンの波数と一致してSPを共鳴励起する方法であり、プリズムを必要としないことなどから、実用的なセンサーへの応用が検討されてきている。本研究では、金属グレーティング上での白色光照射多重励起型表面プラズモン共鳴現象を利用したセンサーへの応用を行ったので報告する。また、可視域で大きなエレクトロクロミズムを持つPEDOT-PSS/テルピリジン鉄錯体ポリマーを用いて、センシング感度の向上を試みた。

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  • P-11 教育GP「つもり学習からの脱却」(ポスター発表,(08)工学教育に関するGood Practice):: 電気・電子系の実施事例

    鈴木 孝昌, 菅原 晃, 新保 一成, 福井 聡, 清水 英彦, 大平 泰生

    工学・工業教育研究講演会講演論文集   2009 ( 0 )   604 - 605   2009年

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    記述言語:日本語   出版者・発行元:公益社団法人 日本工学教育協会  

    DOI: 10.20549/jseejaarc.2009.0_604

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  • Digest report on investigation committee on nano-interface properties of organic and composite thin films and device/sensor applications

    Keizo Kato, Tetsushi Okamoto, Kazunari Shinbo, Yusuke Aoki

    Proceedings of the International Symposium on Electrical Insulating Materials   2008年12月

  • AFMナノリソグラフィによる導電性高分子前駆体の局所表面形状操作

    小柳 遼平, 馬場 暁, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, ジャン グオシャン, アドビンクラ リゴベルト

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   108 ( 348 )   29 - 32   2008年12月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    導電性高分子は伸縮性やドーピング効果などの様々な特徴を持ち、電子デバイスへの応用が期待されている。一方、このような電子デバイスのさらなる高集積化、高速化を目指すには微細加工技術の発展が必要不可欠である。本研究では、AFMを用いてカルバゾール前駆体ポリマー薄膜に局所的に電圧を印加することにより、エレクトロアクティブなペンダントモノマーであるカルバゾールの重合(架橋)、ドーピングを試みた。また、その時の表面形状の変化をAFMにより評価を行なった。薄膜の処理条件を変えて表面形状を観察した結果、走査速度が遅く、印加電圧が大きくなるほど表面形状の変化が大きくなる傾向があることが分かった。また、AFMで局所処理を行なった部分の導電率の変化も観察された。

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  • 光導波路型表面プラズモン共鳴および水晶振動子微量天秤法を用いた複合蒸気センシング

    新保 一成, 鶴貝 嘉則, 相田 和也, 大平 泰生, 馬場 暁, 加藤 景三, 金子 双男, 宮寺 信生

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   108 ( 280 )   39 - 43   2008年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    表面プラズモン共鳴(SPR)法と水晶振動子微量天秤(QCM)法により同時測定が可能な素子を作製し、ポリビニルアルコール(PVA)薄膜の堆積と、PVA薄膜に対する湿度および有機溶媒蒸気の吸着を測定した。水晶を導波した光は、水晶上の金属薄膜における表面プラズモン励起のため吸収を受け、またその吸収ピークはPVA薄膜の膜厚に依存した。これより、本素子でSPR測定が可能であることが示され、これを用いて種々の蒸気の吸着による吸収特性とQCM発振周波数変化も同時観測した。なお、SPR特性において湿度応答は膜厚に依存しており、表面からの電界のしみだし距離に関係しているものと考えられた。

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  • アゾベンゼン分子薄膜の近接場光加工とサズミクロン物質の配列制御

    木村 浩章, 山崎 初, 大平 泰生, 新保 一成, 馬場 暁, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. CPM, 電子部品・材料   108 ( 269 )   29 - 33   2008年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    物質近傍に局在する近接場光は、光波長以下のナノメートル領域における物質の微細加工や、これを用いた光近接場の励起と輸送制御による高速・高機能な光制御素子への応用が期待されている。これらを実現するためには、外部光で制御可能な物質配列法の開発が重要な要素技術となる。本研究では、エバネッセント定在波でアゾベンゼン分子薄膜を簡便に光微細加工し、これを下地層に用いたサブミクロン物質の配列制御法の開発を行った。特に、格子状に加工されたアゾ薄膜を用いた誘電体微小球の配列制御、および、光追加工による微小球の位置制御について調べた。また、斜方蒸着法により作製した金属ナノワイヤとこれにより発現する近接場光学特性も調べたので報告する。

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  • 細管内金属ワイヤ電極を用いたエレクトロスピニング法による高分子ファイバーの作製

    星野 力哉, 小野塚 信太郎, 大平 泰生, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. CPM, 電子部品・材料   108 ( 269 )   35 - 39   2008年10月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    エレクトロスピニング法において、高分子溶液を満たしたテフロン細管内に銅ワイヤを挿入し、これを電極として用いてポリマーファイバーを作製した。このような電極構造とすることで、形成されるファイバー径は小さくなり、さらに印加電圧、電極間距離、用いる高分子溶液量も低減できる。この手法でポリビニルアルコールファイバーを種々の条件で作製し、その構造を調べた。また、回転コレクト電極を用いた配向制御、ファイバーを用いた電界効果トランジスタの試作を行った。本研究で用いた電極構造は、エレクトロスピニング法によるファイバーの構造制御や、ファイバーのデバイス応用に有用と考える。

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  • CS-4-7 ポリ(3-アミノベンジルアミン)を用いた電気化学-表面プラズモン共鳴分光法によるカテコールアミンの検出(CS-4.有機・バイオデバイスに向けた界面の役割,シンポジウムセッション)

    馬場 暁, 萬年 冬竜, 石神 良平, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男, 福田 伸子, 牛島 洋史

    電子情報通信学会ソサイエティ大会講演論文集   2008 ( 2 )   "S - 20"-"S-21"   2008年9月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

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  • 平成19年度「リフレッシュ理科教室」開催報告 : 北陸信越支部 新潟会場

    鈴木 孝昌, 坪井 望, 新保 一成, 大平 泰生, 岩野 春男, 丸山 武男

    応用物理教育   32 ( 1 )   49 - 52   2008年7月

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  • ナノ構造制御有機薄膜の表面プラズモン励起と放射光

    加藤 景三, 羽深 恵, 大平 泰生, 馬場 暁, 新保 一成, 金子 双男

    電気学会研究会資料. EFM, 電子材料研究会   2008 ( 6 )   35 - 40   2008年5月

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  • CuPc薄膜FETへのV_2O_5薄膜の積層による効果

    高橋 俊明, 北村 翔平, 皆川 正寛, 大平 泰生, 馬場 暁, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. OME, 有機エレクトロニクス   107 ( 307 )   7 - 10   2007年11月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    五酸化バナジウム(V_2O_5)は、有機電界発光素子において電荷発生層として機能し、電流効率を向上させることが知られている。本研究では、ゲート電圧印加時のV_2O_5層からのキャリア注入により有機層における電荷量と電流伝導を改善することを目指し、ホール伝導性の有機半導体材料である銅フタロシアニン(CuPc)とV_2O_5を積層した電界効果トランジスタを作製した。その結果、電流値ではCuPc単層に比べ2倍ほど増加がみられ、CuPcおよびV_2O_5の相互作用によるものと考えられた。

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  • 偏極光近接場における光異性化反応を用いたアゾ色素分子薄膜の光加工

    片桐 大介, 小根澤 琢磨, 大平 泰生, 新保 一成, 加藤 景三, 金子 双男

    電子情報通信学会技術研究報告. CPM, 電子部品・材料   107 ( 178 )   21 - 25   2007年8月

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    記述言語:日本語   出版者・発行元:一般社団法人電子情報通信学会  

    物質近傍に存在する近接場光は,光反応性分子薄膜のナノメートルサイズの光加工を可能にする.本研究では,光近接場における局所的な偏光を利用したアゾ色素分子薄膜の光加工について研究する.ここでは,平坦誘電体表面におけるエバネッセント波の重ね合わせにより,局所的に偏極した近接場光を発生させ,アゾ色素分子薄膜と相互作用させることで,近接場光の偏光分布に対応する加工形状が得られることを明らかにした.更に,偏光した光近接場励起における加工薄膜の発光過程を観測し,その偏光異方性および過渡特性から,偏極光近接場におけるアゾ分子の光異性化過程について詳しく調べた.

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  • 2006年度リフレッシュ理科教室報告

    星宮 務, 高井 吉明, 池田 浩也, 吉田 憲充, 伊藤 貴司, 田中 功, 岩田 聡, 塩見 繁, 竹尾 隆, 坪井 望, 鈴木 孝昌, 新保 一成, 大平 泰生, 柳沢 淳一, 中西 俊介, 平松 信康, 中野 善明, 毛塚 博史, 鈴木 恒則, 笹野 睦雄, 光井 俊治, 山口 益弘

    應用物理   76 ( 5 )   527 - 537