2021/11/27 更新

写真a

ババ アキラ
馬場 暁
BABA Akira
所属
教育研究院 自然科学系 情報電子工学系列 教授
工学部 工学科 教授
職名
教授
外部リンク

学位

  • 博士(工学) ( 1999年9月   新潟大学 )

研究分野

  • ナノテク・材料 / 応用物理一般  / 応用物性 / 有機・分子エレクトロニクス

  • 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(researchmap)

  • 新潟大学   工学部 工学科   教授

    2020年4月 - 現在

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  • 新潟大学   工学部 工学科   准教授

    2017年4月 - 2020年3月

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  • 新潟大学   工学部 電気電子工学科 電子物性デバイス   准教授

    2015年10月 - 2017年3月

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  • 新潟大学   研究推進機構 超域学術院   准教授

    2013年10月 - 2015年9月

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  • 九州大学 先導物質化学研究所   非常勤講師(兼任)

    2012年4月 - 2013年3月

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  • (独)産業技術総合研究所   客員研究員(兼任)

    2012年4月 - 2013年3月

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  • 新潟大学   研究推進機構 超域学術院   准教授

    2011年4月 - 2013年9月

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  • 新潟大学   超域研究機構   准教授

    2007年4月 - 2011年3月

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  • (独)産業技術総合研究所   客員研究員(兼任)

    2007年4月 - 2011年3月

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  • (独)産業技術総合研究所光技術研究部門   招聘研究員

    2007年1月 - 2007年3月

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  • 米国・ヒューストン大学 化学科   リサーチアソシエイトスタッフ

    2004年6月 - 2006年12月

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  • 米国・アラバマ大学バーミングハム校 化学科   博士研究員

    2003年7月 - 2004年6月

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  • シンガポール国立大学 材料科学科   TPプロジェクト研究員

    2003年1月 - 2003年7月

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  • ドイツ・マックスプランク高分子研究所   博士研究員

    1999年11月 - 2002年12月

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▶ 全件表示

経歴

  • 新潟大学   工学部 工学科   教授

    2020年4月 - 現在

  • 新潟大学   工学部 工学科   准教授

    2017年4月 - 2020年3月

  • 新潟大学   電子物性デバイス   准教授

    2015年10月 - 2017年3月

  • 新潟大学   研究推進機構 超域学術院   准教授

    2011年4月 - 2015年9月

  • 新潟大学   超域研究機構   准教授

    2007年4月 - 2011年3月

学歴

  • 新潟大学   大学院自然科学研究科   エネルギー基礎科学専攻

    - 1999年

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  • 新潟大学   工学部   電気電子工学科

    - 1995年

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所属学協会

委員歴

  • 電子情報通信学会   信越支部運営員会委員  

    2019年6月 - 現在   

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    団体区分:学協会

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  • 文部科学省 科学技術学術政策研究所 科学技術予測センター   専門調査員  

    2019年6月 - 現在   

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    団体区分:政府

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  • 応用物理学会北陸・信越支部   新潟地区幹事  

    2019年4月 - 現在   

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    団体区分:学協会

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  • 応用物理学会 有機分子・バイオエレクトロニクス分科会   常任幹事  

    2019年4月 - 現在   

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    団体区分:学協会

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  • 日本表面真空学会   編集委員  

    2019年3月 - 現在   

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    団体区分:学協会

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  • 電子情報通信学会   エレクトロニクスソサイエティ和文論文誌編集委員会 編集委員  

    2018年6月 - 現在   

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    団体区分:学協会

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  • 電気学会   先進ナノ材料・構造制御と革新的有機デバイス開発・ライフサイエンス応用調査専門委員会 幹事補佐  

    2017年7月 - 現在   

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    団体区分:学協会

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  • 電子情報通信学会   有機エレクトロニクス研究専門委員会 専門委員  

    2017年6月 - 現在   

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    団体区分:学協会

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  • 電気学会   東京支部新潟支所 幹事  

    2017年4月 - 現在   

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    団体区分:学協会

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  • 応用物理学会   有機ナノ界面制御素子デバイス研究会 副委員長  

    2017年4月 - 現在   

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    団体区分:学協会

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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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  • Improvement of organic solar cell performance by multiple plasmonic excitations using mixed-silver nanoprisms

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

    Journal of Science: Advanced Materials and Devices   6 ( 2 )   264 - 270   2021年6月

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    掲載種別:研究論文(学術雑誌)  

    Three different silver nanoprisms (AgNPrs) were combined and used as light-trapping materials in organic solar cells (OSCs). These mixed AgNPrs (M-AgNPrs) increased the photocarrier generation in the OSCs due to the broadband absorption, which was attributed to mutual multiple plasmonic excitations covering the entire visible light region. The M-AgNPrs were incorporated into a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) hole-transport layer in the OSCs. The UV–vis spectra, atomic force microscope images and current density versus voltage curves of the fabricated devices were recorded at different loading concentrations of the M-AgNPrs. Finite-difference time-domain simulation, impedance spectroscopy, and measurement of incident photon-to-current efficiency of the devices confirmed the effect of the multiple plasmonic excitations. The results suggest that, in an optimum condition, the efficiency of the OSCs loaded with M-AgNPrs was 7.9% higher than the reference OSC.

    DOI: 10.1016/j.jsamd.2021.02.007

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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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  • 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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  • 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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  • 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

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

    Japanese Journal of Applied Physics   59 ( 11 )   116501 - 116501   2020年11月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.35848/1347-4065/abbfe6

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    その他リンク: https://iopscience.iop.org/article/10.35848/1347-4065/abbfe6/pdf

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

    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)   出版者・発行元:Informa UK Limited  

    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

    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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    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 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 C-61 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 surfacesviathe 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 (J(SC)) and power conversion efficiency (PCE) in comparison to that of the reference cell was achieved. The fabricated device provides a J(SC) 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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  • Electrocatalytic Glycerol Oxidation Enabled by Surface Plasmon Polariton-induced Hot Carriers in Kretschmann Configuration 査読

    Kyungwha Chung, Xingzhong Zhu, Xiaolu Zhuo, Yu Jin Jang, Chi Hun Choi, June Sang Lee, Seung-hoon Kim, Minju Kim, Kiheung Kim, Donghyun Kim, Hyung Chul Ham, Akira Baba, Jianfang Wang, Dong Ha Kim

    Nanoscale   2019年11月

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

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

    Asia Communications and Photonics Conference, ACP   2019-November   2019年11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)  

    Asia Communications and Photonics Conference (ACP) © OSA 2019 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.

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  • Detection of Creatinine Using Silver Nanoparticles on 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 )   SCCA02 - SCCA02   2019年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.7567/1347-4065/ab4a94

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    その他リンク: http://iopscience.iop.org/article/10.7567/1347-4065/ab4a94/pdf

  • 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 )   SCCA04 - SCCA04   2019年10月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.7567/1347-4065/ab48c9

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    その他リンク: http://iopscience.iop.org/article/10.7567/1347-4065/ab48c9/pdf

  • 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10月

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    掲載種別:研究論文(学術雑誌)  

    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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  • Fabrication of a quartz-crystal microbalance/surface-plasmon-resonance hybrid sensor and taking advantage of their responses for evaluation of thin films and liquids

    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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    掲載種別:研究論文(国際会議プロシーディングス)  

    © 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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  • 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 & Interfaces   11 ( 12 )   11954 - 11960   2019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)  

    DOI: 10.1021/acsami.9b01617

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

    C. Lertvachirapaiboon, I. Kiyokawa, A. Baba, K. Shinbo, K. Kato

    Analytical Letters   52 ( 12 )   1939 - 1950   2019年4月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1080/00032719.2019.1586913

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  • Optical sensing platform for 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3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2116/analsci.18P412

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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   2019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)  

    DOI: 10.1007/s11468-019-01006-8

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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 Osotochan, Akira Baba

    IEICE Transactions on Electronics   102 ( 2 )   125 - 131   2019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)  

    DOI: 10.1587/transele.2018OMP0004

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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1月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1080/15421406.2019.1645466

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

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

    Journal of Nanoscience and Nanotechnology   19 ( 8 )   4727 - 4731   2019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)  

    DOI: 10.1166/jnn.2019.16704

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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 )   SCCC01 - SCCC01   2019年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.7567/1347-4065/ab4cfd

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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.

    DOI: 10.1039/c8na00119g

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

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

    Optics InfoBase Conference Papers   Part F138-ACPC 2019   2019年

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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)  

    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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  • 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)  

    DOI: 10.1007/s11468-018-0768-5

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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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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1557/mrc.2018.141

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  • A Smartphone-based surface plasmon resonance platform 査読

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    Anaytical Methods   10 ( 39 )   4732 - 4740   2018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)  

    DOI: 10.1039/C8AY01561A

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  • Rh blood phenotyping (D, E, e, C, c) microarrays using multichannel surface plasmon resonance imaging 査読

    Chinnawut Pipatpanukul, Sasaki Takeya, Akira Baba, Ratthasart Amarit, Armote Somboonkaew, Boonsong Sutapun, Pimpun Kitpoka, Mongkol Kunakorn, Toemsak Srikhirin

    Biosensors and Bioelectronics   102   267 - 275   2018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 Ltd  

    The application of Surface Plasmon Resonance Imaging (SPRi) for the detection of transmembrane antigen of the Rhesus (Rh) blood group system is demonstrated. Clinically significant Rh blood group system antigens, including D, C, E, c, and e, can be simultaneously identified via solid phase immobilization assay, which offers significant time savings and assay simplification. Red blood cells (RBCs) flowed through the micro-channel, where a suitable condition for Rh blood group detection was an RBC dilution of 1:10 with a stop-flow condition. Stop flow showed an improvement in specific binding compared to continuous flow. Rh antigens required a longer incubation time to react with the immobilized antibody than A and B antigens due to the difference in antigen type and their location on the RBC. The interaction between the immobilized antibodies and their specific antigenic counterpart on the RBC showed a significant difference in RBC removal behavior using shear flow, measured from the decay of the SPR signal. The strength of the interaction between the immobilized antibody and RBC antigen was determined from the minimum wall shear stress required to start the decay process in the SPR signal. For a given range of immobilized antibody surface densities, the Rh antigen possesses a stronger interaction than A, B, and AB antigens. Identification of 82 samples of ABO and Rh blood groups using SPRi showed good agreement with the standard micro-column agglutination technique. A wider coverage of antigenic recognition for RBC when using the solid phase immobilization assay was demonstrated for the RBC with the antigenic site located on the transmembrane protein of the clinically significant Rh antigen. Given the level of accuracy and precision, the technique showed potential for the detection of the Rh minor blood group system.

    DOI: 10.1016/j.bios.2017.10.049

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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  

    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.

    DOI: 10.1557/mrc.2017.131

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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 )   02CA07-1 - 02CA07-7   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  

    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 & BIOELECTRONICS   99   399 - 415   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:ELSEVIER ADVANCED TECHNOLOGY  

    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 )   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)  

    DOI: 10.1002/app.45641

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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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  • 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   Vol. 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)  

    DOI: 10.1080/15421406.2018.1456146

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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)  

    DOI: 10.1002/app.45641

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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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    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 Electrical Engineers of Japan  

    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.

    DOI: 10.23919/ISEIM.2017.8166530

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

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

    PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION   34 ( 11 )   1700133 (8 pages)   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  

    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/photo-sensitization 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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  • 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.

    DOI: 10.2116/analsci.33.443

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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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  • 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, Kazunan 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 SOC 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-C-61-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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  • 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 招待 査読

    加藤景三, 馬場 暁, 新保一成, 金子双男

    電子情報通信学会論文誌C   J100-C ( 3 )   132 - 140   2017年3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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  • 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 )   017002   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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  • 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%.

    DOI: 10.1039/c6cp06931b

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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, Chutiparn Lertvachirapaiboon, 馬場 暁, 新保一成, 加藤景三, 金子双男

    電気学会論文誌A   136 ( 11 )   690 - 696   2016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/ieejfms.136.690

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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.

    DOI: 10.1007/s00289-016-1683-6

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  • Electropolymerization and Properties of Poly(3-anilinethiophene) Thin Film 査読

    Saengrawee Sriwichai, Paphawadee Netsuwan, Sukon Phanichphant, Akira Baba

    Chiang Mai Journal of Science   Vol. 4   863 - 869   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)  

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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.

    DOI: 10.1039/c6cp02373h

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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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  • 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 )   02BB06 (4 pages)   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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  • 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 (5 pages)   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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  • 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   Article ID:1432781 (8 pages)   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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  • 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 and Francis Inc.  

    A quartz-crystal-microbalance (QCM) and surface-plasmon-resonance (SPR) hybrid sensor was prepared, and the sorptions of water and ethanol vapors to polyvinyl alcohol (PVA) films were observed in situ. The shift of the SPR wavelength depended on the PVA film thickness as well as the sorbed vapor. It was estimated to be due to the film swelling induced by the vapor sorption and the relationship between the film thickness and the penetration depth of evanescent wave.

    DOI: 10.1080/15421406.2015.1097002

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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   135 ( 10 )   624 - 629   2015年10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/ieejfms.135.624

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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 TRANSACTIONS ON ELECTRONICS   E98C ( 2 )   98 - 103   2015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  

    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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  • 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 TRANSACTIONS ON ELECTRONICS   E98C ( 2 )   104 - 109   2015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  

    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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  • 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 TRANSACTIONS ON ELECTRONICS   E98C ( 2 )   136 - 138   2015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 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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  • 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   Article ID: 650516 (7 pages)   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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  • 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)  

    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.

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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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  • Surface Plasmon Spectroscopy Methods and Electrochemical Analysis 査読

    Akira Baba, Rigoberto Advincula

    Handbook of Spectroscopy: Second, Enlarged Edition   3-4   1159 - 1178   2014年6月

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Wiley Blackwell  

    This chapter contains sections titled: Introduction Combined Surface Plasmon Resonance Methods and Electrochemical Measurements Investigation of Electropolymerization Process of Conducting Polymer Thin Films by EC-SPR Electrochemical SPR-surface plasmon light scattering (SPLS) Electrochemical SPR-SPPL Applications to Biosensors Conclusions References

    DOI: 10.1002/9783527654703.ch30

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  • Surface plasmon resonance properties of silver nanoparticle 2D sheets on metal gratings 査読

    Akira Baba, Keisuke Imazu, Akihito Yoshida, Daisuke Tanaka, Kaoru Tamada

    SPRINGERPLUS   3   284(1) - 284(10)   2014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 INTERNATIONAL PUBLISHING AG  

    Grating-coupled propagating surface plasmons associated with silver-nanoparticle 2D crystalline sheets exhibit sensitive plasmonic resonance tuning. Multilayered silver-nanoparticle 2D crystalline sheets are fabricated on gold or silver grating surfaces by the Langmuir-Blodgett method. We show that the deposition of Ag crystalline nanosheets on Au or Ag grating surfaces causes a drastic change in propagating surface plasmon resonance (SPR) both in angle measurements at fixed wavelengths and in fixed incident-angle mode by irradiation of white light. The dielectric constant of the multilayered silver nanosheet is estimated by a rigorous coupled-wave analysis. We find that the dielectric constant drastically increases as the number of silver-nanosheet layers increases. The experimentally obtained SP dispersions of Ag crystalline nanosheets on Au and Ag gratings are compared with the calculated SP dispersion curves. The drastic change in the surface plasmon resonance caused by the deposition of Ag-nanoparticle 2D crystalline sheets on metal grating surfaces suggests the potential for applications in highly sensitive sensors or for plasmonic devices requiring greatly enhanced electric fields.

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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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  • 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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  • 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   Article ID: 865423 (8 pages)   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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  • 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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  • 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.

    DOI: 10.1080/15421406.2013.803887

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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.

    DOI: 10.1080/15421406.2013.804775

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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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  • 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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  • 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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  • 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.

    DOI: 10.1587/transele.E96.0.385

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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

    DOI: 10.1143/JJAP.51.101601

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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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  • Monitoring in situ Electrochemical Crosslinking in Nanostructured Precursor Polymer Films by EC-SPR Spectroscopy 査読

    Guoqian Jiang, Chengyu Huang, Akira Baba, Rigoberto Advincula

    MACROMOLECULAR REACTION ENGINEERING   6 ( 4 )   153 - 159   2012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-V C H VERLAG GMBH  

    The optical/electrochemical and crosslinking properties of polycarbazole LbL films is studied using EC-SPR spectroscopy. The in situ electrochemical crosslinking and doping/de-doping properties are monitored for several different layered film structures. P4VPCBZ and PCEMMA are used as precursor polyelectrolytes, PAA and PDADMAC as non-crosslinkable polyelectrolytes, which are effective barrier layers for electron transfer. The changes in reflectivity and charge during CV illustrates that quantitative control of electrochemical crosslinking and doping/de-doping can be achieved by varying the composition of the precursor and counter-polyelectrolyte layers. The method may provide new opportunities for basic studies of model conjugated polymer systems and for electrooptic device applications.

    DOI: 10.1002/mren.201100068

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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 )   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

    DOI: 10.1143/APEX.5.036603

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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.

    DOI: 10.1587/transele.E94.C.1824

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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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  • Electrochemical Surface Plasmon Resonance Methods for Polymer Thin Films 査読

    Akira Baba, Futao Kaneko, Rigoberto Advincula, Wolfgang Knoll

    Functional Polymer Films   2   723 - 744   2011年6月

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    記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:Wiley-VCH  

    DOI: 10.1002/9783527638482.ch22

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  • Thiolene-based microfluidic flow cells for surface plasmon resonance imaging 査読

    Gareth Sheppard, Takao Oseki, Akira Baba, Derek Patton, Futao Kaneko, Leidong Mao, Jason Locklin

    BIOMICROFLUIDICS   5 ( 2 )   026501-1 - 026501-6   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 INST PHYSICS  

    Thiolene-based microfluidic devices have been coupled with surface plasmon resonance imaging (SPRI) to provide an integrated platform to study interfacial interactions in both aqueous and organic solutions. In this work, we develop a photolithographic method that interfaces commercially available thiolene resin to gold and glass substrates to generate microfluidic channels with excellent adhesion that leave the underlying sensor surface free from contamination and readily available for surface modification through self-assembly. These devices can sustain high flow rates and have excellent solvent compatibility even with several organic solvents. To demonstrate the versatility of these devices, we have conducted nanomolar detection of streptavidin-biotin interactions using in situ SPRI. (C) 2011 American Institute of Physics. [doi:10.1063/1.3596395]

    DOI: 10.1063/1.3596395

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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.

    DOI: 10.1021/am200304x

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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.

    DOI: 10.3938/jkps.58.1402

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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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  • 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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  • Transmission Surface Plasmon Resonance Immunosensor based on Poly(pyrrole-3-carboxylic acid) Thin Film for the Detection of Human IgG

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

    Six International Conference on Molecular Electronics and Bioelectronics   ( D-O-7 )   66   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.

    DOI: 10.1587/transele.E94.C.196

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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   51   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)  

    DOI: 10.1143/JJAP.50.01BC15

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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

    DOI: 10.1143/JJAP.50.01BK02

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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 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.

    DOI: 10.1039/c1jm12935j

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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.

    DOI: 10.1063/1.3666646

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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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  • Evaluation of phthalocyanine film deposition using hybrid sensor of quartz crystal microbalance and optical waveguide spectroscopy 査読

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

    PROCEEDINGS OF 2011 INTERNATIONAL CONFERENCE ON ELECTRICAL INSULATING MATERIALS (ISEIM)   455 - 457   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  

    A hybrid sensor of quartz crystal microbalance (QCM) and optical waveguide (OWG) spectroscopies was prepared, and in-situ observations were carried out for lead phthalocyanine (PbPc) film depositions using vacuum evaporation technique. The peak wavelength of the absorption spectra changed with the PbPc film thickness. The responses of QCM frequency and optical absorption were also observed, and they suggested the phase formation changed with the thickness. Furthermore, the X-ray diffraction (XRD) pattern and the atomic force microscope (AFM) image were investigated for the film.

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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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  • 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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  • Humidity detection by using a hybrid Sensor of optical waveguide and quartz crystal microbalance

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

    Pacifichem2010   964   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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  • On the Monolayer Adsorption of Thiol-Terminated Dendritic Oligothiophenes onto Gold Surfaces 査読

    Guoqian Jiang, Suxiang Deng, Akira Baba, Chengyu Huang, Rigoberto C. Advincula

    MACROMOLECULAR CHEMISTRY AND PHYSICS   211 ( 24 )   2562 - 2572   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:WILEY-V C H VERLAG GMBH  

    The self-assembled monolayer formation of a series of thiophene dendron thiols with different generations and alkyl chain lengths onto gold surfaces is studied. Average film thicknesses and dielectric constants were calculated from SPR using a two-subphase differential method. The in situ adsorption of the thiophene dendron thiols was monitored by SPR kinetics measurements and fitted using an empirical three-step model. Electrochemical redox molecular probing experiments provided additional insight into surface coverage, which showed different abilities to block electron transfer at the monolayer/electrode interfaces. The surface coverage of the films was also estimated by QCM measurements and supported by static WCA measurements.

    DOI: 10.1002/macp.201000427

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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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  • Electrochemical Surface Plasmon Resonance and Field-Enhanced Light Scattering: Monomer Copolymerization with a Polysiloxane-Conjugated Polythiophene Network Precursor 査読

    Akira Baba, Chuanjun Xia, Wolfgang Knoll, Rigoberto C. Advincula

    MACROMOLECULAR CHEMISTRY AND PHYSICS   211 ( 24 )   2624 - 2635   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:WILEY-V C H VERLAG GMBH  

    The in situ electrochemical and dielectric film properties of monomer co-electropolymerization with a CPN precursor was investigated. A polysiloxane/polythiophene precursor was electropolymerized with thiophene monomer at different composition ratios using cyclic voltammetry. This was investigated in situ by EC-SPR spectroscopy and EC-SPFELS. The characteristic oscillations corresponded to distinct transitions in film deposition. The resonance coupling of the SPR decreased with higher thiophene monomer content. Increasing the amount of thiophene monomer increased the RMS roughness of the film as observed by AFM, which corresponded to an increase in scattered light intensity with EC-SPFELS.

    DOI: 10.1002/macp.201000471

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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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  • 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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  • 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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  • 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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  • 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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    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 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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  • 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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    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 Resonance and Waveguide-Enhanced Glucose Biosensing with N-Alkylaminated Polypyrrole/Glucose Oxidase Multilayers 査読

    Akira Baba, Prasad Taranekar, Ramakrishna R. Ponnapati, Wolfgang Knoll, Rigoberto C. Advincula

    ACS APPLIED MATERIALS & INTERFACES   2 ( 8 )   2347 - 2354   2010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 work we report an electrochemical surface plasmon resonance/waveguide (EC-SPR/waveguide) glucose biosensor that could detect enzymatic reactions in a conducting polymer/glucose oxidase (GO(x)) multilayer thin film. In order to achieve a controlled enzyme electrode and waveguide mode, GO(x) (negatively charged) was immobilized with a water-soluble, conducting N-alkylaminated polypyrrole (positively charged) using the layer-by-layer (LbL) electrostatic self-assembly technique. The electrochemical and optical signals were simultaneously obtained from the composite LbL enzyme electrode upon the addition of glucose as mediated by the electroactivity and electrochromic property of the polypyrrole layers. Signal enhancement in EC-SPR detection is obtained by monitoring the doping=dedoping events on the polypyrrole. The real-time optical signal could be distinguished between the change in the dielectric constant of the enzyme layer and other nonenzymatic reaction events such as adsorption of glucose and the change of the refractive index of the solution. This was possible by correlation of both the SPR mode and the m = and 1 modes of the waveguide in an SPR/waveguide spectroscopy experiment.

    DOI: 10.1021/am100373v

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  • Fabrication of Grating-Coupling Surface Plasmon Resonance Enhanced Dye-Sensitized Solar Cell

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

    LB13   21   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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  • 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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    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 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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    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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    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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  • 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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  • 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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    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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  • 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<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)  

    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SiO2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   193 - 197   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)  

    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   130 ( 2 )   193 - 197   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)  

    DOI: 10.1541/ieejfms.130.193

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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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  • 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.

    DOI: 10.1080/15421401003609764

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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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  • 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

    DOI: 10.1143/JJAP.49.04DK22

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Surface Plasmon Resonance Immunosensor Based on Electropolymerized Poly(3-aminobenzoic acid) for Labelfree Detection of Human Ig G

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

    238th ACS National Meeting   ( 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)  

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

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

    APPLIED PHYSICS EXPRESS   2 ( 7 )   071502-1 - 071502-3   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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  • 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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  • 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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  • Micro/nanopatterning of single-walled carbon nanotube-organic semiconductor composites 査読

    Akira Baba, Fuminobu Sato, Nobuko Fukuda, Hirobumi Ushijima, Kiyoshi Yase

    NANOTECHNOLOGY   20 ( 8 )   85301-1 - 85301-6   2009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  

    In this study, micro/nanopatterning and assembly of single-walled carbon nanotube-organic semiconductor composites using dip-pen nanolithography, microcontact printing and fountain-pen nanolithography techniques are described. First, the solubilization abilities of carbon nanotubes with Alcian blue-tetrakis(methyl pyridium) chloride (AB) are investigated by UV-visible spectroscopy. The assembly of the composites obtained by microcontact printing technique shows well-ordered monolayers of 1 mu m linewidth pattern. Dip-pen nanolithography shows that 11 nm height and 100 nm linewidth can be obtained on silicon wafer substrates. Finally, fountain-pen nanolithography is shown as a possible large-scale carbon nanotube assembly technique.

    DOI: 10.1088/0957-4484/20/8/085301

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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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  • pH-Controlled Two Dimensional Gold Nanoparticle Aggregates for Systematic Study of Local Surface Plasmon Coupling 査読

    Xinheng Li, Kaoru Tamada, Akira Baba, Masahiko Hara

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   9 ( 1 )   408 - 416   2009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 SCIENTIFIC PUBLISHERS  

    We report a way of using citrates, ionic capping molecules on gold nanoparticles, as a "tuner" to adjust the charge density on the particles by solution pH, in correlation with their association constants (pKa). We have synthesized 10% biotin-capped gold nanoparticles with 90% citrates covering on the remaining surfaces. The controlled electrostatic repulsion force between the particles determines the distance between the particles on substrate, i.e., the surface density of the particles, even for the case of immobilization via biotin-avidin reaction. Thus the density of gold nanoparticles on surface was varied in a wide range systematically, especially to high density, and the optical response of two dimensional particle aggregates was investigated to discuss the effect of local plasmon coupling. The UV-vis-Near-IR reflection absorption spectrum of the particle aggregates at low pH (pH &lt; pKa2) appeared with a transverse resonance at ca. lambda = 520 nm and a longitudinal resonance widened and red-shifted to lambda = 680 nm. Surface plasmon resonance (SPR) curve of the aggregates exhibits a large shift of the minimum angle position together with a significant increase of the minimum intensity (dip-up), as opposed to a small angle shift and no dip-up for well-dispersed particles. The deviation from the SPR simulation curves based on the Maxwell-Garnett (MG) theory clearly indicates the effect of local plasmon coupling in aggregates. The Kramers-Kronig transformations of the UV-vis-Near-IR spectra and the SPR data analyses with Fresnel&apos;s equations state the increase of the effective dielectric constants of the particle layers with the density of the particles and the formation of aggregates.

    DOI: 10.1166/jnn.2009.J066

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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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  • 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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  • 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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  • 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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  • 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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  • 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 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Azacalix[3]arene-carbazole conjugated polymer network ultrathin films for specific cation sensing 査読

    Chatthai Kaewtong, Guoqian Jiang, Yushin Park, Tim Fulghum, Akira Baba, Buncha Pulpoka, Rigoberto Advincula

    CHEMISTRY OF MATERIALS   20 ( 15 )   4915 - 4924   2008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  

    Developing highly selective and sensitive chemical sensors is a challenge with respect to new materials for chemical recognition. In this study, a new conjugated polymer network precursor, hexahomotriazacalix[3]arene-carbazole has been synthesized and electrochemically cross-linked to form ultrathin films using cyclic voltammetry. The incorporation of hexahomotriazacalix[3]arene moiety as a neutral cation-binding receptor into a conjugated polycarbazole network facilitates high selectivity and sensitivity for Zn(2+). The ultrathin films were characterized spectroscopically using UV-vis absorption and fluorescence spectroscopy. Surface morphology properties were examined by atomic force microscopy. Electrochemical deposition parameters and sensor transduction was studied by an electrochemical quartz crystal microbalance, surface plasmon resonance spectroscopy, and open-circuit potentiometry techniques. The results indicate that the high selectivity and sensitivity for Zn(2+) compared to those of other cations is due to the combined size and dipole specificity of the azacalixarene unit and nonspecific ionic interaction with the redox couple of the conjugated polycarbazole units.

    DOI: 10.1021/cm800284h

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  • Nanostructured ultrathin films of alternating sexithiophenes and electropolymerizable polycarbazole precursor layers investigated by electrochemical surface plasmon resonance (EC-SPR) spectroscopy 査読

    Saengrawee Sriwichai, Akira Baba, Suxiang Deng, Chengyu Huang, Sukon Phanichphant, Rigoberto C. Advincula

    LANGMUIR   24 ( 16 )   9017 - 9023   2008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  

    Nanostructured ultrathin films of linear and dendrimeric cationic sexithiophenes, 6TNL and 6TND, respectively, alternated with anionic polycarbazole precursor, poly(2-(N-carbazolyl) ethyl methacrylate-co-methacrylic acid) or PCEMMA32, were successfully fabricated using the layer-by-layer self-assembly deposition technique. The two electro-optically active oligomers exhibited distinct optical properties and aggregation behavior in solution and films as studied by UV-vis and fluorescence spectroscopy. The stepwise increase of the 6TNL/PCEMMA32 and 6TND/PCEMMA32 layers was confirmed by UV-yis spectroscopy and in situ surface plasmon resonance (SPR) spectroscopy. The intralayer electrochemical polymerization and cross-linking behavior of the carbazole functionalized PCEMMA32 layers were then investigated using cyclic voltammetry (CV) and electrochemical surface plasmon resonance (EC-SPR) spectroscopy. The increase in current with each cycle confirmed intralayer cross-linking followed by the doping-dedoping process within these films. The two types of films differed with respect to dielectric constant and thickness changes before and after electropolymerization, indicating the influence of the oligothiophene layers. This demonstrated for the first time the preparation of highly ordered organic semiconductors alternated with in situ electropolymerizable layers in ultrathin films.

    DOI: 10.1021/la800307u

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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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    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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  • Hybrid CdSe Nanoparticle–Carbazole Dendron Boxes: Electropolymerization and Energy-Transfer Mechanism Shift 査読

    Yushin Park, Prasad Taranekar, Jin Young Park, Akira Baba, Timothy Fulghum, Ramakrishna Ponnapati, Rigoberto C. Advincula

    Advanced Functional Materials   18 ( 14 )   2071 - 2078   2008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: 10.1002/adfm.200701201

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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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  • Nanocomposite films of a polyfluorene copolymer and carbazole-thiol-capped gold nanoparticles: Electrochemical crosslinking and energy-transfer properties 査読

    Prasad Taranekar, Chengyu Huang, Timothy M. Fulghum, Akira Baba, Guoqian Jiang, Jin-Young Park, Rigoberto C. Advincula

    ADVANCED FUNCTIONAL MATERIALS   18 ( 2 )   347 - 354   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:WILEY-V C H VERLAG GMBH  

    The preparation and properties of an electrochemically crosslinked Au nanoparticle/polyvinylcarbazole (PVK)/polyfluorene (PFC) nanocomposite film is described. Blends of the blue-light emitting PFC, PVK, and the 11-(9H-carbazol-9-yl)-undecane-1-thiol-capped Au nanoparticles (CBZ-S-Au) were prepared as thin films by spin-coating and subsequent crosslinking by cyclic voltammetry (CV). The electrochemical properties are then evaluated on the basis of the redox behavior (reversibility) and electron-transport properties of the films. They are further characterized by UV-vis spectroscopy, photoluminescence spectroscopy, and atomic force microscopy (AFM). The large differences in photoluminescence properties of the CBZ-S-Au/PFCVK crosslinked copolymer composite film compared to the PFCVK polymer alone result in an efficient energy-transfer system, in which the excimer peak is almost totally quenched. This indicates a compatible match between the absorbance of the An plasmons and the emission of the excimer energy trap from PF polymers. Furthermore, electrochemical crosslinking enhances this match both by shifting the absorbance to greater overlap and decreasing the Forster distance between the Au nanoparticle and the PFCVK polymer chains.

    DOI: 10.1002/adfm.200700972

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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  

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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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  • 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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  • SPR-based DNA detection with metal nanoparticles 査読

    Kaoru Tamada, Fumio Nakamura, Masateru Ito, Xinheng Li, Akira Baba

    PLASMONICS   2 ( 4 )   185 - 191   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:SPRINGER  

    In this short review paper, we summarize some of our ideas to utilize gold nanoparticles for the enhancement of surface plasmon resonance signals on DNA microarray. The hybridization of target-DNA capped gold nanoparticles with probe DNA on surface provides ca. ten times stronger optical contrast compared with that of target-DNA molecules. Our simulation result based on the Maxwell-Garnet theory explains well our experimental data and proves a potential of metallic nanoparticles for the substantial sensitivity enhancements for biosensor application in DNA diagnostics and bio-affinity studies, which leads to the fabrication of high resolution DNA microarrays.

    DOI: 10.1007/s11468-007-9035-x

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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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  • 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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  • 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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  • 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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  • Enhancement of surface plasmon resonance signals by gold nanoparticles on high-density DNA microarrays 査読

    Masateru Ito, Fumio Nakamura, Akira Baba, Kaoru Tamada, Hirobumi Ushijima, King Hang Aaron Lau, Abhijit Manna, Wolfgang Knoll

    JOURNAL OF PHYSICAL CHEMISTRY C   111 ( 31 )   11653 - 11662   2007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  

    We have developed a new methodology to fabricate high-resolution DNA microarrays (2500 dots/cm(2)) in combination with microcontact printing (mu CP) and surface plasmon resonance (SPR) imaging. A novel COOH-terminated PEG-disulfide with para-carborane (p-carborane) was synthesized as an initiator chemically bound to a gold substrate for surface coupling reactions with NH2-terminated DNA. The hybridization between target DNA immobilized on gold nanoparticles and probe DNA arrayed on flat gold substrates was successfully demonstrated by SPR imaging, where nonspecific adsorption was not observed at the array background. The gold nanoparticles on the array give quite high contrast even at low surface coverage with gold nanoparticles (similar to 10%) by the enhancement effect of optical signals based on nanoscale phenomena. This enhancement effect can be well described by the simulation based on the Maxwell-Garnett theory for the effective dielectric constants and Fresnel's equation.

    DOI: 10.1021/jp070524m

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  • POLY 284-Fabrication and characterization of nanostructured carbon nanotubes/organic materials composites 査読

    Akira Baba, Fuminobu Sato, Nobuko Fukuda, Hirobumi Ushijima, Kiyoshi Yase

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   234   2007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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  • Ultrathin conjugated polymer network films of carbazole functionalized poly(p-phenylenes) via electropolymerization 査読

    Renu Ravindranath, Parayil Kumaran Ajikumar, Sheeja Bahulayan, Nurmawati Bte Muhammad Hanafiah, Akira Baba, Rigoberto C. Advincula, Wolfgang Knoll, Suresh Valiyaveettil

    JOURNAL OF PHYSICAL CHEMISTRY B   111 ( 23 )   6336 - 6343   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)   出版者・発行元:AMER CHEMICAL SOC  

    Ultrathin films of a cross-linked and chemically distinct conjugated poly(p-phenylene) network via electropolymerization are described. The amphiphilic network precursor was synthesized by incorporating the alkoxy carbazole group (-O(CH2)(5)Cb) to a poly(p-phenylene) (C6PPPOH) backbone. In order to investigate the combined thin film electrochemical and photophysical properties of poly(p-phenylene)s and polycarbazole conjugated polymers, C6PPPC5Cb was deposited on substrates using the Langmuir Blodgett Kuhn (LBK) method. The monolayer isotherm of the polymer, C6PPPC5Cb, showed a liquid expanded region slightly different from the parent polymer C6PPPOH. Multilayers (up to 30 layers) were transferred to different substrates such as quartz, gold coated LaSFN9 and ITO substrates for analysis. For conversion to a conjugated polymer network (CPN) film, the electroactive carbazole group was electropolymerized using cyclic voltammetry (CV) resulting in polycarbazole linking units. The differences in the film properties and corresponding changes in the electrochemical behavior indicate the importance of film thickness and electron/ion transport process in cross linked network films. From the electrochemical studies, the scan rate was found to have a considerable effect on electropolymerization with higher oxidation and reduction peak values found for the rigid network polymer compared to the uncrosslinked polymers.

    DOI: 10.1021/jp070127b

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  • Electrochemical Co-polymerization of Electrochromic Precursor Polymers Based on Terthiophene and Carbazole Containing Conjugated Polymer Network Film Precursors: EC-QCM and EC-SPR 査読

    Prasad Taranekar, Timothy Fulghum, Akira Baba, Derek Patton, Rigoberto Advincula

    Langmuir   Vol. 23   908 - 917   2007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)  

    DOI: 10.1021/la061820d

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  • Nanopatterning and Fabrication of Write-read-erasable Memory Devices from Layer-by-Layer Poly (3, 4-ethylenedioxythiophene): Poly (styrene sulfonate) (PEDOT: PSS) Ultrathin Films 査読

    Guoqian Jiang, Akira Baba, Rigoberto Advincula

    Langmuir   Vol. 23   817 - 825   2007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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  • Signal Enhancement and Tuning of Surface Plasmon Resonance: ATR Spectroscopy and Imaging of Hybrid Gold Nanoparticles/Polyelectrolytes 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

    The Journal of Physical Chemistry C   Vol. 111   18687 - 18694   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp075986e

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  • Dendrimer precursors for nanomolar and picomolar real-time surface plasmon resonance/potentiometric chemical nerve agent sensing using electrochemically crosslinked ultrathin films 査読

    Prasad Taranekar, Akira Baba, Jin Young Park, Timothy M. Fulghum, Rigoberto Advincula

    ADVANCED FUNCTIONAL MATERIALS   16 ( 15 )   2000 - 2007   2006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  

    Nanomolar detection and specific recognition of pinacolyl methylphosphonate (PMP), a hydrolysis product and an analog of a relatively persistent class of toxic nerve agents, has been achieved. In addition, picomolar sensitivity is observed with methylphosphonic acid (MPA), an end-hydrolysis product for all organophosphate-based nerve agents. This is achieved using a combined surface plasmon resonance (SPR) and potentiometry setup. A modified polyamidoamine (PAMAM) carbazole/Cu2+ dendrimer, which is electrochemically crosslinked on a self-assembled monolayer (SAM) modified An substrate, is used as an active sensing element for trapping the nerve-agent analogs. The ultrathin films have been used to study the anchoring of nerve agents via non-covalent interactions. The carbazole to amine ratio is optimized to ensure free primary amines are available to interact with the analyte and the Cu2+ ions present in the system, which further enhances the selectivity. The carbazole group on the periphery serves a dual purpose: crosslinking the dendrimers to form a conjugated network film, and generating the potentiometric response. The adsorption kinetics are monitored by using an in situ SPR/potentiometric setup. This technique not only offers a real-time dual detection of highly toxic nerve-agent analogs, but also shows viability for future sensor-device applications.

    DOI: 10.1002/adfm.200600147

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  • Electro-nanopatterning of surface relief gratings on azobenzene layer-by-layer ultrathin films by current-sensing atomic force microscopy 査読

    Akira Baba, Guoqian Jiang, Kang-Min Park, Jin-Young Park, Hoon-Kyu Shin, Rigoberto Advincula

    JOURNAL OF PHYSICAL CHEMISTRY B   110 ( 35 )   17309 - 17314   2006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  

    The electro-nanopatterning and mechanism of pattern formation in azobenzene-containing layer-by-layer (LbL) ultrathin films is described using surface probe microscopy techniques. First, arrays of nanodots were patterned on these films to investigate applied time at constant voltage bias dependence in electro-nanopatterning. The anisotropic mass transport and polar alignment of the azobenzene-containing films were observed after applying the electric field and heating the sample locally with the cantilever tip. On the basis of this novel phenomenon, small-sized surface relief gratings (SRG)s and their alignment were fabricated and observed by current-sensing atomic force microscopy. The rate of mass transport for the polymer is mainly controlled by the applied time at constant voltage bias between the cantilever and the electrode/substrate.

    DOI: 10.1021/jp063955y

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  • Estimation of dielectric function of biotin-capped gold nanoparticles via signal enhancement on surface plasmon resonance 査読

    Xinheng Li, Kaoru Tamada, Akira Baba, Wolfgang Knoll, Masahiko Hara

    JOURNAL OF PHYSICAL CHEMISTRY B   110 ( 32 )   15755 - 15762   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:AMER CHEMICAL SOC  

    Biotin-capped gold nanoparticles assembled on flat gold with volume fraction f are studied by surface plasmon resonance (SPR) spectroscopy and atomic force microscopy (AFM) in order to estimate the dielectric function of the gold nanoparticles based on the Maxwell-Garnett (MG) theory. The complex dielectric function (epsilon', epsilon") of the spherical nanoparticles at three representative wavelengths in the vis-near-IR region, i.e., lambda = 543, 632.8, and 1152 nm, is estimated for a surface homogeneously covered with nanoparticles in order to discuss the wavelength dependence of the dielectric function. The SPR response of a surface covered with particles in 2D aggregates is also analyzed. The experimental SPR curve of the particle aggregates deviates from the theoretical predictions, suggesting dipole interactions between particles.

    DOI: 10.1021/jp062004h

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  • Simultaneous in situ electrochemical, surface plasmon optical, and atomic force microscopy measurements: Investigation of conjugated polymer electropolymerization 査読

    A Baba, W Knoll, R Advincula

    REVIEW OF SCIENTIFIC INSTRUMENTS   77 ( 6 )   064101-1 - 064101-6   2006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 INST PHYSICS  

    We report the simultaneous in situ electrochemical, optical, and surface morphological studies of conjugated polymer ultrathin film formation using a novel combined electrochemical instrumentation-surface plasmon resonance spectroscopy-atomic force microscopy. The initial stages of the electropolymerization of poly(3,4-ethylenedioxythiophene) films on flat gold electrode/substrates were observed in all three experiments simultaneously. In addition to the electrochemical information obtained, the surface plasmon optical technique showed the deposition of the film, and provided electrochromic behavior of the deposited film. Simultaneously, atomic force microscopy gave surface morphological properties and domain growth of the film. The complementarity of the information obtained from the combined techniques is useful for the investigation of polymer growth mechanism between cyclic voltammetry and potentiostatic deposition methods. (c) 2006 American Institute of Physics.

    DOI: 10.1063/1.2204587

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  • Conjugated poly (phenylacetylene) films cross-linked with electropolymerized polycarbazole precursors 査読

    T Fulghum, SMA Karim, A Baba, P Taranekar, T Nakai, T Masuda, RC Advincula

    MACROMOLECULES   39 ( 4 )   1467 - 1473   2006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:AMER CHEMICAL SOC  

    In this work, we describe the synthesis and electropolymerization of conjugated substituted polyacetylenes, poly(N-alkoxy-(p-ethynylphenyl)carbazole) or PPA-Cz-Cn with electropolymerizable carbazole side groups to form conjugated polymer network (CPN) films. The phenylacetylene monomer was functionalized with a carbazole group separated by an alkylene spacer. Polymerization of the monomer in solution is accomplished using a Rh catalyst to form a "precursor polymer". The electrochemical behavior and cross-linking of the carbazole side group was then investigated by cyclic voltammetry (CV) and spectroelectrochemistry. A trend in the redox electrochemical behavior was observed with varying alkyl spacer length between the poly(phenylacetylene) backbone and carbazole side-group. The resulting film combines the electrooptical properties of the conjugated poly(phenylacetylene) polymer with polycarbazole units in a cross-linked electropolymerized film as evidenced by the CV and spectroelectrochemical behavior. This study emphasizes the preparation of polymer materials with mixed pi-conjugated species arising from the electrochemical cross-linking of a designed precursor polymer.

    DOI: 10.1021/ma0510946

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  • Akira Baba, Jason Locklin, Risheng Xu, Rigoberto Advincula 査読

    Nanopatterning, Nano-Charge writing in Layer-by-Layer Quinquethiophene, N, Phthalocyanine (CuPS, Ultrathin Films

    The Journal of Physical Chemistry B   Vol. 110   42 - 45   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)  

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  • Polymer thin film photodegradation and photochemical crosslinking: FT-IR imaging, evanescent waveguide spectroscopy, and QCM investigations 査読

    MD Millan, J Locklin, T Fulghum, A Baba, RC Advincula

    POLYMER   46 ( 15 )   5556 - 5568   2005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:ELSEVIER SCI LTD  

    Photodegradation and photocrosslinking of benzophenone blended polystyrene (PS) thin films were investigated primarily using Fourier transform infrared (FT-IR) imaging, evanescent waveguide spectroscopy (WS), and quartz crystal microbalance (QCM) methods. The main objective is to observe the changes (spectral and chemical) indicative of these competitive processes in an ultrathin polymer film. This also serves as a model study in the application of combined spectroscopic, optical, and acoustic methods towards understanding crosslinking and degradation phenomena within the same time frame of observation. To induce photocrosslinking, 1, 1 2-dodecanediyibis(oxy-4, 1-phenylene)] [bis[phenylmethanone] (2BP12), a small molecule with two benzophenone groups, was blended with PS in solution, spincast onto glass and silicon substrates, and irradiated with ultraviolet light. Photodegradation and benzophenone-mediated crosslinking were observed both directly via functional group spectroscopies and indirectly via their effects on thin film surface properties and morphologies. Atomic force microscopy (AFM) and QCM were used to elucidate local morphology change and mass-uptake kinetics in the presence Of 02 in air, respectively. All results correlated well with the two photoprocesses occurring simultaneously and competitively on these films with the refractive index, thickness, and mass change differing with the presence of 2BP12. Crosslinking was observed to cause an increase in thickness while photodegradation gave a decrease. Both processes resulted in an increase in the refractive index and mass. While various methods have separately identified these observations, this is the first instance that the in situ chemical, optical, and structural dimensionality of the photodegradation and photocrosslinking phenomena in a thin polymer film is correlated within the same time frame of observation. (c) 2005 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.polymer.2005.05.050

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  • Conjugated polymer network films from precursor polymers: Electrocopolymerization of a binary electroactive monomer composition 査読

    P Taranekar, A Baba, TM Fulghum, R Advincula

    MACROMOLECULES   38 ( 9 )   3679 - 3687   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:AMER CHEMICAL SOC  

    We report the synthesis and electropolymerization of a precursor polymer with a binary molecular composition of thiophene and carbazole electroactive groups to form ultrathin films of conjugated polymer networks (CPN) on flat indium tin oxide (ITO) substrates. In the past we have demonstrated the precursor polymer approach based on a single pendant electroactive group. In this work, we describe the interesting electrocopolymerization mechanism and properties of precursor polymers prepared with two different types of pendant electroactive groups (statistical copolymer) and compared behavior to their respective homopolymers. The presence of a smaller amount of carbazole induces the electropolymerization of the higher oxidation potential thiophene units via the reaction of a radical cation and a neutral molecule pathway. These electrochemically generated thin films gave unique optical, electrochemical, and morphological properties as a function of composition. The film properties were investigated by cyclic voltammetry (CV), spectroelectrochemistry, EQCM, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS).

    DOI: 10.1021/ma050001h

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  • Resonance shifts in SPR curves of nonabsorbing, weakly absorbing, and strongly absorbing dielectrics 査読

    S Ekgasit, A Tangcharoenbumrungsuk, F Yu, A Baba, W Knoll

    SENSORS AND ACTUATORS B-CHEMICAL   105 ( 2 )   532 - 541   2005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  

    The resonance shifts (i.e., the resonance angle and the reflectance minimum) in surface plasmon resonance (SPR) curves due to the complex refractive index and/or thickness variations of dielectric films were investigated. For both, nonabsorbing and absorbing dielectrics, the resonance angle shifts linearly with the refractive index and/or thickness variations. The reflectance minimum of the nonabsorbing dielectric does not change as the resonance angle shifts. For an absorbing dielectric, the direction of the reflectance change depends strongly on the magnitude of the absorption and thickness of the metal film. The reflectance minimum of the sensor with a thin metal film decreases before increasing while that of the sensor with a thick metal film continuously increases as the absorption of the dielectric film increases. The phenomena were theoretically explained based on the SPR-gencrated evanescent field at the metal/dielectric interface associated with the optical properties of the sensor architecture. (c) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.snb.2004.07.015

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  • Thiophene Dendron Jacketed Poly(amidoamine) Dendrimers: Nanoparticle Synthesis, Spectroscopic and Microscopic Study 査読

    Suxiang Deng, Jason Locklin, Derek Patton, Akira Baba, Amanda Guloy, Rigoberto C. Advincula

    Journal of the American Chemical Society   Vol. 127   1744 - 1751   2005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)  

    DOI: 10.1021/ja046144l

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  • Investigating work function tunable hole-injection/transport layers of electrodeposited polycarbazole network thin films 査読

    A Baba, K Onishi, W Knoll, RC Advincula

    JOURNAL OF PHYSICAL CHEMISTRY B   108 ( 49 )   18949 - 18955   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)   出版者・発行元:AMER CHEMICAL SOC  

    Electrochemical doping properties and morphology changes of electropolymerized poly(N-vinylcarbazole) (PVK) thin films were investigated toward improved hole-injection/transport properties in polymer light emitting diode (PLED) devices. The conjugated network polycarbazole thin films (resulting from a poly(N-carbazole) (PCz) network) were prepared by electrodeposition of PVK and/or N-vinylcarbazole comonomer via precursor route and were investigated in situ by electrochemical-surface plasmon resonance spectroscopy (EC-SPS). Distinct doping-dedoping properties and morphology transitions were observed with different compositions of PVK and Cz. By electrochemical doping of the cross-linked conjugated polycarbazole units, the electrochemical equilibrium potential (E-eq), which correlates to Fermi level (E-f) or the work function (phi(w)) of the film, was adjusted in the vicinity of the anode electrode. The conjugated network PCz films were then used as a hole-injection/transport layer in a two layer device. Remarkable enhancement of PLED properties was observed when optimal electrochemical doping was done with the films. Important insight was gained on charge transport phenomena between polymer materials and conducting oxide substrates.

    DOI: 10.1021/jp047965f

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  • Functional thin polymer films at high pressure 査読

    A Baba, G Kleideiter, T Jakob, W Knoll

    MACROMOLECULAR CHEMISTRY AND PHYSICS   205 ( 17 )   2267 - 2274   2004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  

    A new thin-film characterization setup was created based on the combination of a surface plasmon spectrometer with an electrochemical. cell operated under high pressure of up to 200 MPa, and at temperatures up to 120 degreesC. The examples given to document its performance include,photoisomerization studies with poly(methyl methacrylate) (PMMA) films partly derivatized with disperse red (DRI), as well as, a preliminary account of the electropolymerization of EDOT under pressure and the assessment of the redox properties of the resulting thin PEDOT films.

    DOI: 10.1002/macp.200400332

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  • Conjugated oligothiophene-dendron-capped CdSe nanoparticles: Synthesis and energy transfer 査読

    J Locklin, D Patton, SX Deng, A Baba, M Millan, RC Advincula

    CHEMISTRY OF MATERIALS   16 ( 24 )   5187 - 5193   2004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:AMER CHEMICAL SOC  

    In this study, we demonstrate the synthesis of branched oligothiophene dendrons that act as electroactive surfactants for the capping of CdSe nanocrystals through a ligand exchange process. The number of dendrons per nanocrystal and the nature of surface coordination interactions were studied in detail using UV-vis, FT-IR, AFM, and photoluminescence spectroscopies. These dendron/nanocrystal complexes are very soluble in nonpolar solvents and exhibit photoinduced charge-transfer interactions between the two species. One-layer photovoltaic cells were fabricated that showed initial power conversion efficiencies of 0.29%.

    DOI: 10.1021/cm048961q

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  • Electrochemical patterning of a polyfluorene precursor polymer from a microcontact printed (mu CP) monolayer 査読

    CJ Xia, RC Advincula, A Baba, W Knoll

    CHEMISTRY OF MATERIALS   16 ( 15 )   2852 - 2856   2004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:AMER CHEMICAL SOC  

    Selective area electropolymerization of a precursor polymer in a microcontact printed pattern was used to generate a patterned conjugated and fluorescent polymer thin film. The precursor polyfluorene polymer, which has photoluminescent properties defined by the polymer main chain and electropolymerizability from the pendant carbazole units, was synthesized using a Yamamoto coupling route. The polymer was then electrochemically deposited and cross-linked selectively on the alkyl SAM defined regions to form patterns (&lt;50 nm height) with high fidelity. The patterns were characterized by atomic force microscopy and optical fluorescence microscopy. The fluorescence micrograph confirmed that the polymer main chain was largely unaffected by redox electrochemistry and showed highly regular patterning characteristics in a large area. This new combination of site-selective electropolymerization and the precursor approach should provide a unique way to make patterned conjugated polymer systems.

    DOI: 10.1021/cm049544g

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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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  • Electropolymerization and doping/dedoping properties of polyaniline thin films as studied by electrochemical-surface plasmon spectroscopy and by the quartz crystal microbalance 査読

    A Baba, SJ Tian, F Stefani, CJ Xia, ZH Wang, RC Advincula, D Johannsmann, W Knoll

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   562 ( 1 )   95 - 103   2004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:ELSEVIER SCIENCE SA  

    The electropolymerization and doping/dedoping properties of polyanifine ultrathin films on Au electrode surfaces were investigated by a combination of in situ electrochemical techniques, i.e., electrochemical surface plasmon spectroscopy (ESPR) and the electrochemical quartz crystal microbalance (EQCM). In the ESPR measurements, we employed two wavelengths, i.e., 632.8 and 1152 nm in order to distinguish independently the electrochromic behavior. In addition, we used spectroelectrochemical transmittance measurements in order to probe further the optical properties of the polymer films as a function of the applied potential. The real and imaginary parts of the dielectric constant of the polyanifine thin film at several doping levels was determined quantitatively by taking into consideration the thickness values obtained from the EQCM measurement. The combination of these two techniques provides a powerful method for probing the electrical, optical, and dielectric properties of conjugated ultrathin polymer films. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jelechem.2003.08.012

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  • Attenuated Total Reflection and Emission Properties of Self-Assembled Layer-by-Layer Films Containing Azobenzene Dye 査読

    Keizo Kato, Junichi Kawashima, Kazunari Shinbo, Futao Kaneko, Akira Baba, Rigoberto C. Advincula

    Molecular Crystals and Liquid Crystals   407   105 - 113   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)  

    DOI: 10.1080/744819019

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  • Optical properties of ultrathin poly(3,4-ethylenedioxythiophene) films at several doping levels studied by in situ electrochemical surface plasmon resonance spectroscopy 査読

    A Baba, J Lubben, K Tamada, W Knoll

    LANGMUIR   19 ( 21 )   9058 - 9064   2003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:AMER CHEMICAL SOC  

    In this paper, we report on in situ optical/electrochemical investigations using a combination of surface plasmon resonance spectroscopy and electrochemistry in order to determine the complex dielectric constants of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films. The PEDOT films were deposited by in situ electropolymerization. The film thickness was monitored by a quartz crystal microbalance. In the electrochemical surface plasmon resonance (EC-SPR) measurements, three wavelengths corresponding to interband and intraband electronic transition regions were used in order to investigate electrochromic properties. The optical conductivity was also determined by EC-SPR measurement with a near-infrared laser wavelength which corresponds to the region outside the anomalous dispersion.

    DOI: 10.1021/la034848n

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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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  • Properties of poly(3,4-ethylenedioxythiophene) ultrathin films detected by in situ electrochemical-surface plasmon field-enhanced photoluminescence spectroscopy 査読

    A Baba, W Knoll

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 31 )   7733 - 7738   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:AMER CHEMICAL SOC  

    In this paper, we describe, for the first time, the combination of surface plasmon resonance spectroscopy (SPS) and surface plasmon enhanced photoluminescence spectroscopy (SPPL) with electrochemical techniques for the detection of photoluminescence in poly(3,4-ethylenedioxythiophene) (PEDOT) ultrathin films. The EC-SPS/SPPL technique allows for the recording of the weak photoluminescence from an ultrathin PEDOT film in its neutral state. A distinct photoluminescence switching was observed during the potential dependent doping/dedoping process. The EC-SPS/SPPL characterization results are consistent with the observed PEDOT bulk electrochromic properties obtained from UV-vis-NIR spectra. This suggests that the described combination method is capable of electrochemically controlling and optically detecting the very weak photoluminescence of ultrathin films.

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  • Combining surface plasmon resonance and quartz crystal microbalance for the in situ investigation of the electropolymerization and doping/dedoping of poly(pyrrole) 査読

    A Bund, A Baba, S Berg, D Johannsmann, J Lubben, Z Wang, W Knoll

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 28 )   6743 - 6747   2003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:AMER CHEMICAL SOC  

    An in situ combination of surface plasmon resonance (SPR) spectroscopy and quartz crystal microbalance (QCM) is used to study the electropolymerization and the doping/dedoping behavior of thin poly(pyrrole) (ppy) films in aqueous solutions. A mixed anion and cation exchange behavior is observed. The mass as determined with the QCM continuously increases during redox cycling. The combined QCM/SPR data reveal that this is caused by a relatively slow process occurring when ppy is in the oxidized (polaronic) state. This behavior is interpreted as an accumulation of neutral salt and solvent in the film.

    DOI: 10.1021/jp034043o

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  • Electrochemical growth of dendritic conducting polymer networks 査読

    A Baba, W Knoll

    ADVANCED MATERIALS   15 ( 12 )   1015 - +   2003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:WILEY-V C H VERLAG GMBH  

    A simple approach to fabricate dendritic conducting polymer networks has been developed by means of electropolymerization of pyrrole onto a micropatterned self-assembled monolayer. This polypyrrole network was obtained by a combination of microcontact printing (muCP) of an octadecanethiol self-assembled monolayer (ODT-SAM) pattern on gold and subsequent electropolymerization of pyrrole.

    DOI: 10.1002/adma.200304728

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  • Electroactivity of Polyaniline Multilayer Films in Neutral Solution and Their Electrocatalized Oxidation of NADH Studied by Electrochemistry Combined with Surface Plasmon Spectroscopy and Quartz Crystal Microbalance 査読

    Shengjun Tian, Akira Baba, Jianyun Liu, Zhehui Wang, Wolfgang Knoll, Mi-Kyoung Park, Rigoberto Advincula

    Advanced Functional Materials   Vol. 13   473 - 479   2003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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  • Evaluation of Structure and Emission Property of Alternate Self-Assembled Ultrathin Films Containing Azo-Dye by Surface Plasmon Excitation Method 査読

    Keizo Kato, Junichi Kawashima, Kazunari Shinbo, Futao Kaneko, Akira Baba, Rigoberto C. Advincula

    Transactions of Materials Research Society of Japan   28 ( 1 )   43 - 46   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)  

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  • Photoalignment in ultrathin films of a layer-by-layer deposited water-soluble azobenzene dye 査読

    Rigoberto Advincula, Mi-Kyoung Park, Akira Baba, Futao Kaneko

    Langmuir   19 ( 3 )   654 - 665   2003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)  

    The photoalignment of alternate layer-by-layer (LBL) deposited water-soluble azobenzene dye, direct red 80 (DR80), and polycations have been investigated. The ultrathin films were probed by polarized irradiation, UV-vis spectroscopy, and angle-dependent optical retardation measurements using a hybrid liquid crystal (LC) cell. Dye aggregates within layers were found to reorient anisotropically with polarized irradiated visible light. The selective photoisomerization process primarily enhances the E-isomer, giving high dichroism with the long axes of the azobenzene dye oriented perpendicular to the polarization vector of irradiated light (actinic light). The degree of photoalignment was dependent on the number of adsorbed layers, aggregation behavior, and type of polycation pairs in contrast to spin-coated or Langmuir-Blodgett (LB) films. Atomic force microscopy (AFM) before and after photoisomerization showed lateral expansion of the morphological features consistent with greater anisotropic ordering. These results correlated with the in-plane azimuthal LC photoalignment behavior in hybrid LC cells. Interesting trends were observed, including thickness-dependent photoalignment behavior, different irradiation stabilities, phase shift, and read-write capabilities as photoactive ultrathin films.

    DOI: 10.1021/la025842l

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  • Photoalignment in Layer-by-Layer Ultrathin Films Molecularly Ordered Small Molecule Azobenzene Dyes 査読

    Rigoberto Advincula, Mi-kyoung Park, Akira Baba, Futao Kaneko

    Langmuir   Vol. 19   654 - 665   2003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)  

    DOI: 10.1021/la025842l

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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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  • Simultaneous surface plasmon optical and electrochemical investigation of layer-by-layer self-assembled conducting ultrathin polymer films 査読

    A Baba, MK Park, RC Advincula, W Knoll

    LANGMUIR   18 ( 12 )   4648 - 4652   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:AMER CHEMICAL SOC  

    In this study, we use a novel method for simultaneously measuring the optical and electrochemical proper-ties of layer-by-layer self-assembled conducting ultrathin polymer films. We employed the recently developed combination of in situ surface plasmon resonance spectroscopy (SPS) and surface plasmon field-enhanced light scattering (SPFELS) with an electrochemical method (cyclic voltammetry). Polyaniline (PANI) and sulfonated polyaniline (SPANI) were used as the polycation and the polyanion for the conducting layer-by-layer film assemblies. The doping-dedoping process of the PANI/SPANI at different film thicknesses was investigated by electrochemical-SPS/SPFELS. The potential cycling resulted in characteristic oscillations that were sensitively monitored with this technique. We were able to obtain in situ information on dielectric constant changes of the PANI/SPANI layer-by-layer films with respect to film thickness and their corresponding morphology transitions during the electrochemical process. Thus, this experimental approach allows for the simultaneous elucidation of optical and electrochemical properties of conducting polymers in thin film formats.

    DOI: 10.1021/la011078b

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  • In-situ Investigations of the Electrodeposition and Electrochromic Properties of Poly(3,4-ethylenedioxythiophene) (PEDOT) Ultrathin Films by Surface Plasmon Spectroscopy (SPS) 査読

    Chuanjun Xia, Rigoberto C. Advincula, Akira Baba, Wolfgang Knoll

    Langmuir   Vol. 18   3555 - 3560   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)  

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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.

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  • Photo-Induced in-Plane Alignments of Liquid Crystal Molecules on Alternate Self-Assembled Films of Azo-Dye and Polyelectrolyte Evaluated by the Attenuated Total Reflection Measurement 査読

    Jun Ishikawa, Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Rigoberto C Advincula

    Colloids and Surfaces A: Physicochemical and Engineering Aspects   198–200   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)  

    DOI: 10.1016/S0927-7757(01)01020-2

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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

    F Kaneko, T Kato, A Baba, K Shinbo, K Kato, RC Advincula

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   805 - 810   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  

    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 rim. 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 similar to 30 min exposure with the laser, simultaneous with the formation of the interference patterns. (C) 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(01)01005-6

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  • In situ investigations on the electrochemical polymerization and properties of polyaniline thin films by surface plasmon optical techniques 査読

    A Baba, RC Advincula, W Knoll

    JOURNAL OF PHYSICAL CHEMISTRY B   106 ( 7 )   1581 - 1587   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:AMER CHEMICAL SOC  

    The combination of in situ surface plasmon resonance spectroscopy (SPS) and surface plasmon field-enhanced light scattering (SPLS) with an electrochemical method was used to simultaneously investigate the optical and electrochemical properties of polyaniline films on a planar gold electrode. First, the electropolymerization process of aniline and then the doping-dedoping process of the resulting polyaniline film were investigated using SPS and SPLS. The electropolymerization of aniline was achieved by applying a cycling potential known from cyclic voltammetry. Potential cycling resulted in distinct oscillations sensitively monitored with both techniques. Information was obtained on the change of the dielectric constant of the film and of the film thickness, corresponding to morphology transitions of the polyaniline film. The time-differential SPS kinetic reflectivity curve was correlated with cyclic voltammetry. SPLS was also applied in a reversed attenuated total reflection configuration to obtain more correlation with the electrochemical behavior and optical properties of the polyaniline film, Thus, this combination of experimental approaches allows for the simultaneous elucidation of optical and electrochemical properties of an ultrathin conducting polymer film.

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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

    Jun Ishikawa, Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Rigoberto C. Advincula

    Colloids and Surfaces A   Vols 198-200   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)  

    DOI: 10.1016/S0927-7757(01)01020-2

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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.

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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   Vol.347   15 - 24   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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  • Polyelectrolyte adsorption processes characterized in situ using the quartz crystal microbalance technique: alternate adsorption properties in ultrathin polymer films 査読

    A Baba, F Kaneko, RC Advincula

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   173 ( 1-3 )   39 - 49   2000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 BV  

    The alternate adsorption processes of polyelectrolytes from solution have been investigated in situ using a functionalized (gold electrode) quartz substrate via the quartz crystal microbalance (QCM) technique. The deposition process involved the alternate layer by layer electrostatic (Coulombic) interaction between oppositely charged adsorbing polyelectrolytes resulting in ultrathin multilayer films. Three kinds of polyelectrolyte combinations were used: poly(diallyldimethylammonium chloride) (PDADMAC), poly(ethylenimine) (PEI) and poly(allylamine hydrochloride) (PAH) as the cationic polymers and poly(sodium-4-styrensulfonate) (PSS) as the anionic polymer for polycation/polyanion combinations. The electrical behavior of the piezoelectric 'quartz crystal' was sensitive to the adsorption properties of the polyelectrolytes, thus allowing dose observation of the time-dependent adsorption processes. The adsorption relationship was explored for different polyelectrolyte pair-combinations, alternate solution concentration and the presence of rinsing and drying steps. The results showed that the amount of frequency change is mostly dependent on the immediate subphase environment of the crystal surface, i.e. aqueous environment versus air in relation to the classic Sauerbrey equation. (C) 2000 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0927-7757(00)00579-3

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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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  • 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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  • Evaluation of Temperature and Voltage Dependences of Nematic Liquid Crystal Molecules on LB Films in the Thick Cell using the Attenuated Total Reflection Method 査読

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satosi Kobayashi, Takashi Wakamatsu

    Materials Science & Engineering C   Vols. 8-9   145 - 150   1999年12月

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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   119 ( 1 )   124 - 129   1999年1月

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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:電気学会  

    DOI: 10.1541/ieejfms1990.119.1_124

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  • Evaluation of tilt angles of nematic liquid crystal molecules on polyimide Langmuir-Blodgett films using the attenuated total reflection measurement method 査読

    A Baba, F Kaneko, K Shinbo, K Kato, S Kobayashi, T Wakamatsu

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   37 ( 5A )   2581 - 2586   1998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:JAPAN SOC APPLIED PHYSICS  

    The tilt angles of liquid crystal molecules, 5CB, have been investigated in liquid crystal cells with rubbing-free aligning layers of polyimide (PI) Langmuir-Blodgett (LB) films on aluminum electrodes using the attenuated total reflection (ATR) measurement method. The surface plasmon polariton (SPP) and/or the guided wave excitation modes (GWEM) were observed in the ATR curves of the liquid crystal cells when various DC voltages were applied to the cell. The ATR properties were evaluated from the SPP and the GWEM. The tilt angles of the liquid crystal molecules were calculated by fitting the theoretical ATR curves to the experimental ones using various models of the liquid crystal layer structure. Furthermore, the electric field intensities in the cell were calculated at several incident angles in the ATR curves. The ATR measurement is very useful for evaluating the alignment properties of liquid crystal molecules in liquid crystal cells.

    DOI: 10.1143/JJAP.37.2581

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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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  • 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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  • 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   117 ( 12 )   1233 - 1238   1997年12月

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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:電気学会  

    DOI: 10.1541/ieejfms1990.117.12_1233

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書籍等出版物

  • 「バイオセンサの先端科学技術と新製品への応用開発」

    馬場暁, 新保一成, 加藤景三, 金子双男( 担当: 分担執筆 ,  範囲: 第5章2節「表面プラズモンを共鳴法を用いたバイオセンサの開発」)

    技術情報協会  2014年4月 

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  • "Handbook of Spectroscopy" ed. by Gauglitz, Moore and Vo-Dinh

    Akira Baba, Rigoberto Advincula( 担当: 分担執筆 ,  範囲: Chapter 9-1,Surface Plasmon Spectroscopy Methods and Electrochemical Analysis, pp.1161-1178)

    Wiley-VCH Verlag GmbH  2014年4月 

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  • プラズモンが生み出すこれからの研究開発テーマ ~実用化に向けた求められる技術と課題~

    馬場 暁( 担当: 分担執筆 ,  範囲: pp52-56)

    「月刊 研究開発リーダー」技術情報協会  2013年4月 

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  • 「プラズモンナノ材料開発の最前線と応用」(山田淳監修)

    馬場暁, 新保一成, 加藤景三, 金子双男( 担当: 分担執筆 ,  範囲: 第14章-4 有機薄膜太陽電池:ドライプロセスナノ構造形成,pp232-239)

    2013年4月 

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  • 「高効率太陽電池-高効率化に向けた各種太陽電池の研究・開発最前線-」(壮光舎編集)

    馬場暁, 新保一成, 加藤景三, 金子双男( 担当: 分担執筆 ,  範囲: 第5章-2 金属格子上表面プラズモン励起共鳴有機系太陽電池の開発, pp278-285)

    エヌ・ティー・エス  2012年5月 

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  • 「PEDOTの材料物性とデバイス応用」(奥崎秀典監修)

    馬場 暁( 担当: 分担執筆 ,  範囲: 第6章第7節[1] PEDOTの表面プラズモン共鳴を用いたセンサpp.318-328)

    サイエンス&テクノロジー社  2012年3月 

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  • "Carbon Nanotubes - from Research to Applications", Ed. by S. Bianco

    Akira Baba, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Hirobumi Ushijima, Kiyoshi Yase( 担当: 共著 ,  範囲: Chapter 7, "Assembly and Patterning of Single-Walled Carbon Nanotubes/Organic Semiconductors" pp.111-124)

    Intech  2011年 

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  • “Functional Polymer Films” ed. by Knoll & Advincula

    A. Baba, F. Kaneko, R. Advincula, W. Knoll( 担当: 共著 ,  範囲: Chapter 22, "Electrochemical Surface Plasmon Techniques for Polymer Thin Films" pp.723-744)

    Wiley-VCH  2011年 

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  • SPR イメージング法のバイオセンサー応用:高密度集積型DNA マイクロアレイの開発, 表面科学

    玉田薫, 伊藤正照, 中村史夫, 馬場暁( 担当: 共著 ,  範囲: 第27巻 第 1 号 pp. 21-26)

    表面化学会  2006年1月 

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    記述言語:日本語 著書種別:学術書

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  • 電気化学-表面プラズモン共鳴法による導電性高分子超薄膜界面のその場測定とセンサー応用

    馬場 暁, Rigoberto Advincula, Wolfgang Knoll( 担当: 共著 ,  範囲: 第74巻 第12号 pp.1603-1608)

    応用物理  2005年12月 

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    記述言語:日本語 著書種別:学術書

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  • Novel Methods to Study Interfacial Layers

    Akira Baba, Rigoberto C. Advincula, Wolfgang Knoll( 担当: 共著 ,  範囲: Vol. 11, "Simultaneous Observation of The Electropolymerization Process of Conducting Polymers by Surface Plasmon Resonance Spectroscopy, Surface Plasmon Enhanced Light Scattering and Cyclic Voltammetry" pp55-70)

    Elsevier Science, Studies in Interface Science  2001年12月 

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    記述言語:英語 著書種別:学術書

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  • 表面プラズモン励起を利用した有機薄膜評価

    馬場 暁, 金子双男, Rigoberto C. Advincula, Wolfgang Knoll( 担当: 共著 ,  範囲: Vol. 11, No. 2, pp.159 -166)

    有機分子・バイオエレクトロニクス分科会会誌  2000年12月 

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    記述言語:日本語 著書種別:学術書

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MISC

  • 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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    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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  • 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 (有機エレクトロニクス)

    新保 一成, 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   117 ( 163 )   37 - 40   2017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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  • 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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    記述言語:日本語   出版者・発行元:電気学会  

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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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    記述言語:日本語   出版者・発行元:電気学会  

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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. EFM   2017 ( 1 )   17 - 20   2017年6月

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    記述言語:日本語   出版者・発行元:電気学会  

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  • Propagating Surface Plasmon Resonance on Metallic Grating Structure Detected by Transmission Surface Plasmon Resonance Imaging (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)

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

    電気学会研究会資料. EFM   2017 ( 1 )   37 - 40   2017年6月

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    記述言語:英語   出版者・発行元:電気学会  

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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 (機構デバイス) -- (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 ( 91 )   29 - 32   2017年6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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  • 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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    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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  • 複合プラズモニック構造有機太陽電池の作製と評価 (電子部品・材料) -- (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 ( 92 )   29 - 32   2017年6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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  • 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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    記述言語:日本語   出版者・発行元:電気学会  

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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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    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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  • 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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    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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  • 先進ナノ構造制御と高性能有機デバイス・ライフサイエンス応用調査専門委員会活動概要

    加藤景三, 中島伸一郎, 青木裕介, 馬場暁

    電気電子絶縁材料システムシンポジウム予稿集   47th   273   2016年8月

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    記述言語:日本語  

    J-GLOBAL

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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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    記述言語:日本語   出版者・発行元:電気学会  

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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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    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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  • 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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    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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  • Enhanced Transmission-Surface Plasmon Resonance Signal by Propagating and Localized Plasmon Coupling (有機エレクトロニクス)

    Lertvachirapaiboon Chutiparn, Baba Akira, Shinbo Kazunari

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 163 )   19 - 22   2015年7月

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    記述言語:英語   出版者・発行元:電子情報通信学会  

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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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    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  

    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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    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-13-4 Effect of Nanopiller Height on Plasmonic Organic Polymer Solar Cells Fabricated by Thermal Nanoimprinting Technique

    Pangdam Apichat, Yang Jing, Yang Jing, Shinbo Kazunari, Kato Keizo, Kaneko Futao, Thammacharoen Chuchaat, Hong Minghui, Ekgasit Sanong, Baba Akira

    電子情報通信学会総合大会講演論文集   2015 ( 2 )   110 - 110   2015年2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  

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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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    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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  • 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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    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・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 (機構デバイス 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 ( 94 )   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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  • 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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  • 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 (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)

    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 ( 96 )   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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    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  

    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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    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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  • 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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  • 環境センシング電子光デバイスの開発およびその応用研究

    金子 双男, 加藤 景三, 新保 一成, 馬場 暁

    新潟大学災害・復興科学研究所年報   2   141 - 142   2013年9月

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    記述言語:日本語   出版者・発行元:新潟大学災害・復興科学研究所  

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  • Fabrication and Photocurrent Properties of Gold Nanoparticle-Decorated TiO₂ Nanocomposites Films (有機エレクトロニクス)

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

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   113 ( 42 )   13 - 16   2013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  

    In this work, a simple procedure for synthesis of gold nanoparticle-decorated TiO_2(AuNPs-decorates TiO_2) nanocomposites is reported. By using NaBH_4 as a reducing agent, gold ions were reduced onside at the surface of TiO_2 (P25). The mole ratio of Au/TIO_2 was varied in the range of 0.08% to 8%. TEM images indicated that the AuNPs-decorates TiO_2 nanocomposites were obtained by attaching the spherical gold nanoparticles on the surface of TiO_2 particles. The size of the spherical gold nanoparticles was 3-5 nm while the size of TiO_2 particles was 20 nm. The photocurrent properties of AuNPs-decorates TiO_2 nanocomposite films were also investigated. The preliminary results showed that the short-circuit photocurrent of the AuNPs-decorates TiO_2 films at 2% mole of Au/TiO_2 is 1.9 times more than that of the TiO_2 film.

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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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    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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  • 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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  • 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

    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   112 ( 469 )   9 - 12   2013年

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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-13-2 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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  • 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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    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プ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

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2012 ( 74 )   33 - 36   2012年7月

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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

    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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  • 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 招待

    馬場 暁, 新保一成, 加藤景三, 金子双男

    月刊ディスプレイ   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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    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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  • 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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  • Functional conducting polymers in the application of SPR biosensors

    Rapiphun Janmanee, Sopis Chuekachang, Saengrawee Sriwichai, Akira Baba, Sukon Phanichphant

    Journal of Nanotechnology   2012年

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    記述言語:英語   掲載種別:書評論文,書評,文献紹介等  

    In recent years, conducting polymers have emerged as one of the most promising transducers for both chemical, sensors and biosensors owing to their unique electrical, electrochemical and optical properties that can be used to convert chemical information or biointeractions into electrical or optical signals, which can easily be detected by modern techniques. Different approaches to the application of conducting polymers in chemo- or biosensing applications have been extensively studied. In order to enhance the application of conducting polymers into the area of biosensors, one approach is to introduce functional groups, including carboxylic acid, amine, sulfonate, or thiol groups, into the conducting polymer chain and to form a so-called self-doped or by doping with negatively charged polyelectrolytes. The functional conducting polymers have been successfully utilized to immobilize enzymes for construction of biosensors. Recently, the combination of SPR and electrochemical, known as electrochemical-surface plasmon resonance (EC-SPR), spectroscopy, has been used for in situ investigation of optical and electrical properties of conducting polymer films. Moreover, EC-SPR spectroscopy has been applied for monitoring the interaction between biomolecules and electropolymerized conjugated polymer films in biosensor and immunosensor applications. In this paper, recent development and applications on EC-SPR in biosensors will be reviewed. Copyright © 2012 Rapiphun Janmanee et al.

    DOI: 10.1155/2012/620309

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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   109 ( 48 )   45 - 48   2009年

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  • 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

    電気学会研究会資料. DEI, 誘電・絶縁材料研究会   2008 ( 73 )   39 - 43   2008年11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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  • 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V2O5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   107 ( 307 )   7 - 10   2007年

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  • SPRイメージング法のバイオセンサー応用:高密度集積型DNAマイクロアレイの開発

    玉田薫, 伊藤正照, 中村史夫, 馬場暁

    表面科学   27 ( 1 )   21 - 26   2006年

  • 交互吸着法を用いたレジオレギュラーポリチオフェン/金微粒子複合薄膜の作製(有機材料・デバイス・一般)

    五十嵐 弘, 新保 一成, 金子 双男, 加藤 景三, Locklin Jason, 馬場 暁, Advincula Rigoberto

    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   105 ( 103 )   29 - 33   2005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  

    本研究では光学的、電気的機能性薄膜の作製を目指し、自己組織化交互吸着法(Layer-by-Layer法;LbL法)を用いて大きな電気伝導などの発現が期待できるregioregular poly (3-propanoic acid thiophene)(P3PT)/金微粒子(Au NPs)複合膜を作製した。均一に帯電した基板上に溶液中よりP3PT/PAHとAu NPs/PAHのLbL膜の作製を行った。膜厚は層数の増加に伴い、比例して増加していくことが可視紫外吸収特性とIn-Situ表面プラズモン共鳴特性から確かめられた。AFM像は複合膜の表面モルフォロジーを観察するために測定された。

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  • Electrochemical crosslinking of oligofluorene-capped CdSe nanoparticles via electrochemical cross-linking.

    A Ikarashi, DL Patton, A Baba, J Locklin, RC Advincula, K Kato, K Shinbo, F Kaneko

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   229   U962 - U962   2005年3月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER CHEMICAL SOC  

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  • Nanocomposite multilayer of regioregular poly (3-propanoic acid thiophene)/gold nanoparticle using the layer-by-layer self-assembly technique.

    H Ikarashi, J Locklin, A Baba, RC Advincula, K Shinbo, K Kato, F Kaneko

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   229   U966 - U966   2005年3月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER CHEMICAL SOC  

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  • Nanostructured organic/inorganic multilayer films of TiOx and phthalocyanine derivatives: Application as gas sensors.

    A Baba, J Locklin, RC Advincula, H Ikarashi, K Shinbo, K Kato, F Kaneko

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U543 - U543   2004年3月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER CHEMICAL SOC  

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  • Photoinduced anisotropic response in layer-by-layer ultrathin polymer films as probed by surface plasmons.

    K Kato, K Shinbo, F Kaneko, A Baba, MA Park, RC Advincula

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   227   U472 - U472   2004年3月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER CHEMICAL SOC  

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  • アゾ色素・高分子電解質交互累積膜上の光誘起液晶配向の全反射減衰法による評価

    新保 一成, 石川 淳, 馬場 暁, 加藤 景三, 金子 双男, Advincula R.C.

    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   100 ( 425 )   37 - 42   2000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  

    本研究では、低分子アゾ色素(DR80)と高分子電解質(PDADMAC)の交互累積膜を配向膜とするネマティック液晶(5CB)セルの光誘起面内配向について、全反射減衰法(ATR法)を用いて調べた。これより、表面プラズモン励起による液晶セルのATR特性が観測された。また、液晶セルへの直線偏向可視光の照射によりアゾ色素の光異性化に基づく液晶分子の配列に伴うATR特性の変化が見られた。理論計算結果から、交互吸着膜上の液晶分子は、照射した可視光の偏向方向に対して垂直に配向することが分かった。

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  • ポリビニルシンナメート膜を用いた液晶分子配向の全反射減衰法による評価

    磯部将良, 山形滋徳, 馬場暁, 金子双男, 新保一成, 加藤景三, 若松孝

    電子情報通信学会技術研究報告   98 ( 430(OME98 103-112) )   53 - 58   1998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  

    アルミニウム薄膜上にスピンコートした光重合性のポリビニルシンナメート(PVCi)を液晶配向膜として液晶セルを作製し、配向膜上液晶分子の振る舞いを全反射減衰(ATR)法を用いて評価した。ATR法では導波モードを励起することにより、液晶セル中の液晶分子の配向を観測できる。本研究では、ATRの導波モードの測定結果と理論計算を比較することにより、PVCi膜上液晶層のチルト角を評価した。また、液晶セルを組み立てた後に直線偏光紫外光(LP-UV)の照射を行い、光重合処理によるPVCi膜上の液晶分子の光配向についても検討を行った。

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  • Self‐assembly液晶配向膜の吸着過程の全反射減衰法による評価

    山形滋徳, 馬場暁, 古川智博, 新保一成, 加藤景三, 金子双男, 若松孝

    電気学会化学センサシステム研究会資料   CS-98 ( 16-27 )   15 - 20   1998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  

    液晶配向膜としての応用が考えられる自己組織化薄膜の水溶液中からの吸着過程について、全反射減衰(ATR)法を用いて評価した。ATR法は、金属薄膜の界面で表面プラズモンポラリトン(SPP)を共鳴励起し、その時の反射光を検出するものである。この手法では、水溶液からの吸着現象もその場観察することが可能である。測定の結果、吸着の 1, 2 層目では吸着が安定するまでに8分以上を要するが、3 層目以降ではより短い時間で吸着が安定することがわかった。また、陰イオン性の PSS では層数の増加で一層あたりの膜厚が大きくなっていくが、陽イオン性の PAH では小さくなる現象も観測された。

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  • ATR法によるポリイミドLB膜上液晶分子のチルト角の評価

    馬場 暁, 金子 双男, 新保 一成, 加藤 景三, 小林 敏志, 若松 孝

    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   97 ( 394 )   1 - 6   1997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  

    アルミニウム薄膜上に、ラビングフリーのポリイミド (PI) LB膜を液晶配向膜として用いた液晶セルを作製し、電圧印加による液晶分子の振るまいを全反射減衰 (ATR) 法を用いて評価した。このとき、配向膜表面近傍の液晶分子の配向状態に強く依存する表面プラズモンポラリトン (SPP) と、液晶セル中のバルクでの液晶分子の配向に依存する導波モードを同時に共鳴励起することができた。このATR測定結果と理論計算を比較することで、配向膜表面近傍から液晶セルの中間層に至る液晶分子のチルト角変化を高感度に評価することが可能となった。

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  • 全反射減衰法によるSAM配向膜上液晶の評価

    山形 滋徳, 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   1997 ( 2 )   147 - 147   1997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  

    全反射減衰法(ATR法)は、液晶セルの光導波層に励起される導波モードを用いることにより、この層の光学定数などの情報を求めることができる。液晶分子は、光学的異方性を有しており、液晶分子の配向評価法として、ATR法は有望である。 本研究では、液晶配向膜としてラビングレスの自己組織化膜(Self-Assembled Monolayers, SAM)を用いて液晶セルを作製し、SAM上での液晶分子の配向についてATR法を用いて評価した。

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講演・口頭発表等

  • [Invited Talk] Investigation of Surface Plasmon Enhanced Photo-electric Conversion Systems 招待 国際会議

    Akira Baba

    2019 International Conference on Flexible and Printed Electronics (ICFPE)  2019年10月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Taipei, Taiwan  

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  • [Invited Talk] Development of miniature surface plasmon resonance systems and sensor applications 招待

    Akira Baba, Supeera Nootchanat, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Sanong Ekgasit

    American Chemical Society (ACS) 2019 Fall meeting, Biosensing Symposium  2019年8月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:San Diego, USA  

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  • [Invited Talk] Surface Plasmon Enhanced Organic Devices and Biosensor Applications 招待 国際会議

    Akira Baba

    The 12th Asia-Pacific Conference on Near-Field Optics (APNFO12)  2019年7月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Xiamen, China  

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  • [Keynote] Development of Surface Plasmon Enhanced Photo-electric Conversion Systems 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato

    NanoThailand 2018  2018年12月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

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  • [Invited Talk] Investigation of Plasmonic Systems for Improvement of Organic Solar Cells and Biosensors 招待 国際会議

    Akira Baba, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato

    PERCH-CIC Congress X: 2018 International Congress for Innovation in Chemistry  2018年7月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Pattaya, Chonburi, Thailand  

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  • [Invited Talk] Development of Surface Plasmon Enhanced Photo-electric Conversion Systems 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato

    The 29th International Conference on Molecular Electronics and Devices (IC ME&D 2018)  2018年5月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Daegu, Korea  

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  • [Invited Talk] Surface Plasmon Resonance Excitation Based Organic Device Applications 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    The 4th International Conference on Advanced Electromaterials (ICAE 2017)  2017年11月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Jeju, Korea  

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  • [Invited Talk] Surface Plasmon Resonance Enhanced Organic Devices and Biosensor Applications 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    Materia Manila 2017  2017年10月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Manila, Philippine  

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  • [Invited Talk] Plasmonic-Gold Quantum Dots Hybrid Nanostructures for Improvement of Organic Solar Cells 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    IUMRS-ICAM 2017 The 15th International Conference on Advanced Materials  2017年8月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Kyoto, Japan  

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  • [Invited Talk] Investigation of Plasmonic Systems for Improvement of Organic Solar Cells 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    Ewha Chemistry and Nanoscience International Symposium (ECNIS) 2017  2017年5月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Seoul, Korea  

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  • [Invited Talk] Investigation of Gold Quantum Dots/Plasmonic Systems for Improvement of Organic Solar Cells 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    NANOTEK 2017  2017年3月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Hamburg, Germany  

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  • [Invited Talk] Organic Solar Cells Enhanced by Gold Quantum Dots/Plasmonic System 招待 国際会議

    A. Baba, C. Lertvachirapaiboon, K. Shinbo, K. Kato, F. Kaneko

    EMN Meeting on Energy and Sustainability 2016  2016年11月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Osaka, Japan  

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  • [Invited Talk] Gold Quantum Dots Enhanced Organic Thin Film Solar Cells 招待 国際会議

    A. Baba, A. Pangdam, C. Lertvachirapaiboon, S. Ekgasit, K. Shinbo, K. Kato, F. Kaneko

    The 16th International Discussion & Conference on Nano Interface Controlled Electronic Devices  2016年10月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:Sunchon, Korea  

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  • [有機分子・バイオエレクトロニクス分科内招待講演] 表面プラズモン共鳴励起を利用した有機デバイスへの応用 招待

    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

    第63回応用物理学会春季学術講演会  2016年3月 

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    記述言語:英語   会議種別:口頭発表(招待・特別)  

    開催地:東工大  

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  • [Invited Talk] Detection of Multiple Analytes by Electrochemical-Surface Plasmon Resonance Biosensor 招待 国際会議

    Akira Baba, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Futao Kaneko, Tadashi Yamamoto

    10th International Conference on the Physical Properties and Application of Advanced Materials (ICPMAT2015)  2015年11月 

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    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Chiang Mai, Thailand  

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受賞

  • Hot Article Award, Analytical Sciences

    2019年3月  

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  • / Award for Encouragement of Research in Thin Films

    2011年11月   The 15th International Conference on Thin Films (ICTF-15)  

    馬場 暁

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  • / Nanobiology Fellowship

    2006年10月   Keck Center (USA)  

    馬場 暁

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  • / Research Fellowship

    1999年11月   Alexander von Humboldt Foundation (Germany)  

    馬場 暁

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  • / 第4回応用物理学会講演奨励賞

    1998年3月   応用物理学会  

    馬場 暁

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共同研究・競争的資金等の研究

  • フレキシブルプラズモニック光熱変換フィルムの創製

    研究課題/領域番号:20K21140  2020年7月 - 2023年3月

    日本学術振興会  科学研究費助成事業 挑戦的研究(萌芽)  挑戦的研究(萌芽)

    馬場 暁, L CHUTIPARN

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    配分額:6500000円 ( 直接経費:5000000円 、 間接経費:1500000円 )

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  • 金属微粒子ナノ格子構造複合プラズモン協働場の創製と有機光・電子デバイスへの応用

    研究課題/領域番号:20H02601  2020年4月 - 2024年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    馬場 暁, L CHUTIPARN

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    配分額:17940000円 ( 直接経費:13800000円 、 間接経費:4140000円 )

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  • スマートフォン取り付け透過型表面プラズモン共鳴バイオセンシングシステムの開発

    2018年9月 - 2019年8月

    科学技術振興機構  A-STEP機能検証フェーズ 試験研究タイプ 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • 近赤外域利用複合プラズモニック有機太陽電池の研究

    研究課題/領域番号:17F17361  2017年11月 - 2019年3月

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    馬場 暁, NOOTCHANAT SUPEERA

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    配分額:1100000円 ( 直接経費:1100000円 )

    本研究では、有機薄膜をナノグレーティング電極上に堆積し、近赤外域に励起する表面プラズモンの励起による近赤外域での光電変換特性の向上などを目的としている。今年度は以下のように研究を進めた。
    1)有機太陽電池の近赤外域プラズモン励起特性評価と有機太陽電池-熱電複合デバイスの作製・評価
    近赤外域における表面プラズモン励起による有機太陽電池の特性向上について詳しく検討を行った。まず、ナノインプリントを行うことにより有機太陽電池の活性層、種々の金属/有機薄膜構造界面のナノ構造を形成した。このとき、1Dと2Dグレーティング構造によるプラズモニック効果の違いについても明らかにすることが可能となった。次に、プラズモニック有機太陽電池において発生するプラズモン励起による熱を利用するデバイスへの応用に向けて、プラズモニック有機太陽電池-熱電複合デバイスの作製と評価を行った。この結果、プラズモン励起で電流値の増加が観測され、プラズモンによるAlの温度上昇が得られたことがわかった。
    2)小型表面プラズモンセンサチップの作製と評価
    有機太陽電池はフレキシブル性などから独立型のデバイス電源としても期待されている。ここでは、独立型センサシステムへの応用も目指した小型表面プラズモンセンサチップの作製と評価も行った。限定液滴法を用いたNOA61、またはPDMS小型プリズムを作製して、簡便・小型の表面プラウズモン共鳴センサチップの作製を行った。このセンサを用いて、流路中の溶液の屈折率を変化させて表面プラズモン共鳴波長依存特性を測定したところ、屈折率の変化に伴い表面プラズモン共鳴ディップの線形的な変化が観測された。

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  • 金属グレーティング上ナノ構造制御有機薄膜の表面プラズモン透過光と高感度センサ応用

    研究課題/領域番号:17H03231  2017年4月 - 2020年3月

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    加藤 景三, 馬場 暁, L CHUTIPARN

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    配分額:18200000円 ( 直接経費:14000000円 、 間接経費:4200000円 )

    金属グレーティング上にナノ構造制御有機薄膜を作製し、表面プラズモン(SP)励起による透過光を用いたセンサについて検討した。そして、金属グレーティング上に金属微粒子を含む有機薄膜を作製し、金属薄膜界面のSPと金属微粒子界面の局在SPとの多重SP複合励起により、センサの高感度化が可能であることを明らかにした。さらに、長距離伝搬SP励起による透過光についても検討し、センサのさらなる高感度化が可能であることを示した。また、マイクロ流体デバイスを用いたバイオセンサやそのイメージング、フレキシブルセンサへの応用も可能であることを示した。

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  • フレキシブルプラズモニックセンサーシートの開発

    研究課題/領域番号:16K13662  2016年4月 - 2019年3月

    日本学術振興会  科学研究費助成事業 挑戦的萌芽研究  挑戦的萌芽研究

    馬場 暁, L CHUTIPARN

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:3640000円 ( 直接経費:2800000円 、 間接経費:840000円 )

    本研究では、フレキシブルグレーティング基板上で白色光照射表面プラズモンを共鳴励起し、共鳴状態からの輻射光を検出するセンシングシステムの構築を目指して研究を進めた。その結果、以下の成果が得られた。
    ①透過型表面プラズモン共鳴法とc-MOSカメラを用いたイメージングによるセンシングシステムを構築した。②フレキシブルプラズモニックシートの曲げ伸ばしを行った時の表面プズモン励起特性を明らかにした。③フレキシブルプラズモニックシートとマイクロ流路と組み合わせた透過型表面プラズモン励起波長のイメージング測定において、流路ごとの屈折率変化に対する検出が可能となった。

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  • ナノ金属微粒子を金属格子上に集積したプラズモニック有機デバイスの開発

    2015年6月 - 2018年5月

    日本学術振興会  二国間交流事業(JSPS-NRCT(タイ)) 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • 長距離伝搬表面プラズモンを用いた有機ホトトランジスタの高性能化に関する研究

    研究課題/領域番号:26420301  2014年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    新保 一成, 馬場 暁

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    資金種別:競争的資金

    配分額:5200000円 ( 直接経費:4000000円 、 間接経費:1200000円 )

    本研究では、表面プラズモン共鳴(SPR)に伴い金属表面近傍に生じる強電場を利用して有機薄膜における光吸収を増強させることで、有機ホトトランジスタの高性能化を試みた。特に、通常のSPRよりも電界強度が大きく、しみだし距離が長い長距離伝搬表面プラズモン共鳴(LRSPR)の利用を検討した。実際に素子を作製し、光反射特性においてLRSPRによるディップを観測できた。さらに、LRSPRを伴うp偏光照射での電流測定において、s偏光照射の場合よりも大きな光応答が得られた。

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  • 複合プラズモニック構造による光トラッピングと有機太陽電池への導入

    研究課題/領域番号:25390051  2013年4月 - 2016年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    馬場 暁, 新保 一成

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:5200000円 ( 直接経費:4000000円 、 間接経費:1200000円 )

    本研究では、金属薄膜格子/有機薄膜-金属微粒子界面において、入射光を伝播型・局在型のプラズモンとして電界を増強してナノ領域に閉じ込める光トラッピングに関する基礎的な研究を行った上で、この系を導入した有機太陽電池を作製してデバイス特性の向上に向けた研究行った。この結果、金属格子電極を組み込んだ有機太陽電池、金属微粒子を有機層に混合した有機太陽電池の両方においてのみの場合において、効率の上昇が得らえた。さらに、金属格子電極と金属微粒子を同時に有機太陽電池に組み込むことでさらなる効率の上昇が得られた。種々の電極構造や、局在プラズモン波長の異なる金属微粒子を用いることで最適化の検討を行った。

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  • 透過波長選択型表面プラズモン励起有機デバイスの研究開発

    2012年7月 - 2013年3月

    科学技術振興機構  知財活用促進ハイウェイ 大学特許価値向上支援 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • ナノ構造制御有機薄膜の多重表面プラズモン複合励起と高効率デバイスへの応用

    研究課題/領域番号:24560367  2012年4月 - 2015年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    加藤 景三, 新保 一成, 馬場 暁

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    資金種別:競争的資金

    配分額:5330000円 ( 直接経費:4100000円 、 間接経費:1230000円 )

    グレーティング構造を持つ金属薄膜および有機薄膜の表面プラズモン(SP)励起について種々検討した。また,金属グレーティング薄膜界面を伝搬する伝搬型SPと金属微粒子界面に束縛された局在SPとの多重SP複合励起についても検討した。さらに,透過型SP励起や長距離伝搬SP励起などについても検討した。そして,ナノ構造制御した有機薄膜における多重SP複合励起は,有機デバイスの高効率化に有効であることを示した。

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  • プラズモニック構造導入高効率有機太陽電池の研究開発

    2011年8月 - 2012年3月

    科学技術振興機構  研究成果展開事業 研究成果最適展開支援プログラム フィージビリティスタディステージ【FS】探索タイプ 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • 表面プラズモン複合励起型有機薄膜太陽電池の創製

    2011年4月 - 2013年3月

    日本学術振興会  科学研究費(若手研究(B)) 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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  • 光導波路分光・水晶振動子複合法によるナノ構造物性その場評価とデバイス高機能化

    研究課題/領域番号:23560362  2011年 - 2013年

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    新保 一成, 馬場 暁, 金子 双男, 加藤 景三

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    配分額:5460000円 ( 直接経費:4200000円 、 間接経費:1260000円 )

    本研究では、水晶振動子微量天秤(QCM)法と光導波路分光法の複合センサを作製するとともに、有機機能性薄膜の堆積過程のその場評価を試みた。まず、複合センサの測定系を構築して有機材料の真空蒸着薄膜の膜厚と光吸収特性の関係を詳細に調べた。特に太陽電池材料である鉛フタロシアニンについて調べており、単分子層以下から数十nmまでの膜厚において分子会合体の形成と配向の様子を基板温度や基板表面処理の効果も含めて検討した。またQCMと表面プラズモン共鳴(SPR)法の複合センサと測定系も構築し、大気中および液中における有機膜の堆積過程のその場評価を行った。

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  • プラズモニック構造を有する高効率有機薄膜太陽電池の研究開発

    2010年10月 - 2011年3月

    科学技術振興機構  研究成果最適展開支援事業 フィージビリティスタディステージ【FS】探索タイプ 

    馬場 暁

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    担当区分:研究代表者  資金種別:競争的資金

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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基礎研究

    研究課題/領域番号:21360146  2009年 - 2012年

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    金子 双男, 加藤 景三, 新保 一成, 馬場 暁

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    配分額:17680000円 ( 直接経費:13600000円 、 間接経費:4080000円 )

    キャピラリー内に銅線電極を配置したエレクトロスピニング装置を開発した。本方法によって径の小さいナノファイバーを作製できた。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、その後に電解重合やドーピングを行うことによって、またファイバーへの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。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・バイオセンサを作製し、ヒト免疫グロブリンGの検出を試み、電子デバイス応用への基礎的な研究を行った。

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  • 電解重合法による配向性導電性高分子-カーボンナノチューブ複合薄膜の創製と応用

    研究課題/領域番号:19810005  2007年 - 2008年

    日本学術振興会  科学研究費助成事業 若手研究(スタートアップ)  若手研究(スタートアップ)

    馬場 暁

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    配分額:3115000円 ( 直接経費:2710000円 、 間接経費:405000円 )

    本研究では、導電性高分子薄膜や有機薄膜とカーボンナノチューブからなる複合薄膜の作製や配向を行うためのパターニングを行いセンサーなどデバイス応用のための基礎的な研究を行った。まずカーボンナノチューブをテルチオフェンなどのエレクトロアクティブな分子とπ-π相互作用により吸着させて溶液中に分散し、分散した複合体を用いて電解重合法による薄膜化を行い、導電性高分子-CNT複合薄膜の作製について原子間力顕微鏡(AFM)や光吸収特性、電気化学特性評価により検討を行った。

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担当経験のある授業科目(researchmap)

  • 電子デバイス工学

    機関名:新潟大学

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  • 有機エレクトロニクス特論

    機関名:新潟大学

     詳細を見る

  • 分子エレクトロニクス特論

    機関名:新潟大学

     詳細を見る

  • 電気計測

    機関名:新潟大学

     詳細を見る

  • 半導体デバイス

    機関名:新潟大学

     詳細を見る

  • 技術英語

    機関名:新潟大学

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担当経験のある授業科目

  • 自然科学総論III

    2021年
    -
    現在
    機関名:新潟大学

  • 電子情報通信実験IB

    2020年
    -
    現在
    機関名:新潟大学

  • 論文輪講I

    2020年
    -
    現在
    機関名:新潟大学

  • 電子情報通信実験IIB

    2020年
    -
    現在
    機関名:新潟大学

  • 電子情報通信実験IA

    2020年
    -
    現在
    機関名:新潟大学

  • 電子情報通信実験IIA

    2020年
    -
    現在
    機関名:新潟大学

  • 論文輪講II

    2020年
    -
    現在
    機関名:新潟大学

  • 電子情報通信設計製図

    2020年
    -
    現在
    機関名:新潟大学

  • 工学リテラシー入門(情報電子分野)

    2019年
    -
    現在
    機関名:新潟大学

  • 電子デバイスII

    2019年
    -
    現在
    機関名:新潟大学

  • 総合技術科学演習

    2019年
    -
    現在
    機関名:新潟大学

  • 論文輪講

    2019年
    機関名:新潟大学

  • プログラミング基礎Ⅰ

    2017年
    -
    2018年
    機関名:新潟大学

  • 技術英語

    2016年
    -
    現在
    機関名:新潟大学

  • 電子デバイス工学

    2016年
    -
    2018年
    機関名:新潟大学

  • 工学リテラシー入門(電気電子工学科)

    2016年
    機関名:新潟大学

  • 技術英語入門

    2016年
    機関名:新潟大学

  • 卒業研究

    2014年
    -
    現在
    機関名:新潟大学

  • 電気計測

    2014年
    -
    現在
    機関名:新潟大学

  • 卒業研修

    2014年
    -
    現在
    機関名:新潟大学

  • 電気電子創造設計

    2014年
    -
    2016年
    機関名:新潟大学

  • エレクトロニクスへの招待

    2014年
    -
    2016年
    機関名:新潟大学

  • 半導体デバイス

    2014年
    -
    2016年
    機関名:新潟大学

  • アドバンストテクノロジー

    2009年
    -
    2015年
    機関名:新潟大学

  • 分子エレクトロニクス特論

    2008年
    -
    現在
    機関名:新潟大学

  • 有機エレクトロニクス特論

    2008年
    -
    現在
    機関名:新潟大学

  • エレクトロニクス入門

    2008年
    -
    2016年
    機関名:新潟大学

▶ 全件表示