Updated on 2024/10/03

写真a

 
BABA Akira
 
Organization
Academic Assembly Institute of Science and Technology JOUHOU DENSHI KOUGAKU KEIRETU Professor
Faculty of Engineering Department of Engineering Professor
Title
Professor
External link

Degree

  • Ph.D. ( 1999.9   Niigata University )

Research Areas

  • Nanotechnology/Materials / Applied condensed matter physics  / Organic and Molecular Electronics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

Research History (researchmap)

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2020.4

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  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4 - 2020.3

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  • Niigata University   Faculty of Engineering Department of Electrical and Electronic Engineering Electronic Materials and Devices   Associate Professor

    2015.10 - 2017.3

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  • Niigata University   Institute for Research Promotion Center for Transdisciplinary Research   Associate Professor

    2013.10 - 2015.9

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  • Kyushu University   Part-time Lecturer

    2012.4 - 2013.3

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  • National Institute for Advanced Industrial Science and Technology   Visiting Researcher

    2012.4 - 2013.3

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  • Niigata University   Institute for Research Promotion Center for Transdisciplinary Research   Associate Professor

    2011.4 - 2013.9

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  • Niigata University   Center for Transdisciplinary Research   Associate Professor

    2007.4 - 2011.3

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  • National Institute for Advanced Industrial Science and Technology   Visiting Researcher

    2007.4 - 2011.3

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  • National Institute for Advanced Industrial Science and Technology   Guest Researcher

    2007.1 - 2007.3

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  • University of Houston, Department of Chemistry   Research Associate Staff

    2004.6 - 2006.12

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  • University of Alabama at Birmingham, Department of Chemistry   Postdoctoral Research Fellow

    2003.7 - 2004.6

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  • National University of Singapore, Department of Materials Science   Research Fellow

    2003.1 - 2003.7

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  • Max-Planck-Institute for Polymer Research   Postdoctoral Research Fellow

    1999.11 - 2002.12

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Professor

    2020.4

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4 - 2020.3

  • Niigata University   Abolition organization Electronic Materials and Devices   Associate Professor

    2015.10 - 2017.3

  • Niigata University   Institute for Research Promotion Center for Transdisciplinary Research   Associate Professor

    2011.4 - 2015.9

  • Niigata University   Center for Transdisciplinary Research   Associate Professor

    2007.4 - 2011.3

Education

  • Niigata University   Graduate School of Science and Technology   エネルギー基礎科学専攻

    - 1999

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  • Niigata University   Faculty of Engineering   Department of Electrical and Electronic Engineering

    - 1995

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Professional Memberships

  • The Japan Society of Applied Physics

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  • The Institute of Electrical Engineers of Japan

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  • The Institute of Electronics, Information and Communication Engineers

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Committee Memberships

  • 電子情報通信学会   信越支部運営員会委員  

    2019.6   

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    Committee type:Academic society

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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  

    2019.6   

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    Committee type:Government

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  • 応用物理学会北陸・信越支部   新潟地区幹事  

    2019.4   

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    Committee type:Academic society

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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  

    2019.4   

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    Committee type:Academic society

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  • 日本表面真空学会   編集委員  

    2019.3   

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    Committee type:Academic society

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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  

    2018.6   

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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  

    2017.7   

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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  

    2017.6   

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  • 電気学会   東京支部新潟支所 幹事  

    2017.4   

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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  

    2017.4   

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Papers

  • Gold nanostructures/quantum dots for the enhanced efficiency of organic solar cells. International journal

    Apichat Phengdaam, Sopit Phetsang, Sachiko Jonai, Kazunari Shinbo, Keizo Kato, Akira Baba

    Nanoscale advances   6 ( 14 )   3494 - 3512   2024.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    Incorporating gold nanoparticles (AuNPs) into organic solar cell (OSC) structures provides an effective means to manipulate light-matter interactions. AuNPs have been used as plasmonic-enhancement and light-trapping materials in OSCs and exhibit diverse single and mixed morphologies. Substantial near-field enhancement from metal periodic structures has consistently demonstrated high enhancement in solar cell efficiency. Additionally, coupling with atomic gold clusters in the form of gold quantum dots holds promise for light harvesting through fluorescence phenomena. The configured devices optimize light utilization in OSCs by considering factors such as the morphology, position, and hybridization of localized surface plasmon resonance, propagating surface plasmon resonance, and fluorescence phenomena. This optimization enhances light absorption, scattering, and efficient trapping facilitated by gold nanostructures/quantum dots. The configured setup exhibits multiple effects, concurrently improving plasmonic and fluorescence responses under solar irradiation, thereby enhancing energy conversion performance. Integrating plasmonic nanostructures with OSCs can address fundamental issues, providing opportunities to enhance the light-absorption intensity and charge transfer efficiency at intra and intermolecular levels. This comprehensive review demonstrates that the greatest improvement in solar cell efficiency exceeded 30% compared with the reference cells.

    DOI: 10.1039/d4na00016a

    PubMed

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  • Surface plasmon resonance synergistic coupling effects of gold nanoparticulates with silver grating in P3HT: PC61BM-based organic solar cell

    Joseph Baki Kaore, Sachiko Jonai, Akira Baba, Kazunari Shinbo, Keizo Kato

    Japanese Journal of Applied Physics   63 ( 6 )   2024.6

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    Publishing type:Research paper (scientific journal)  

    A systematic study was carried out to observe possible boosts in the performance of poly-(3-hexyl thiophene):phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) based organic solar cell via synergistic coupling of plasmonic effects. Various volume concentration ratios of gold nanoparticles and nanorods ranging from 2%, 4%, 6%, and 8% were used to determine an optimum condition. An indicative 2% optimum condition led to synergistic tests. The synergistic coupling of gold nanorods with backcontact grating revealed a power conversion efficiency (PCE) of 4.88%. Since post-thermal annealing process results in optimum interfacial surface morphology and structural reorganization, a post-process hypothesis was performed to observe the behavior of the devices at RT with further comparisons at 40 °C. A further increase in the initial performance of the devices was observed with an optimum PCE of 5.43%. The behavior in the performances revealed stable measurements mostly attributed to conditions below the glass transition temperature of P3HT:PC61BM.

    DOI: 10.35848/1347-4065/ad46b4

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  • Influence of Aluminum Pillar Nanostructures on Thin-Film Organic Solar Cells

    Apichat Phengdaam, Nonthanan Sitpathom, Minghui Hong, Kazunari Shinbo, Keizo Kato, Akira Baba

    Physica Status Solidi (A) Applications and Materials Science   2024

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    Publishing type:Research paper (scientific journal)  

    This study explores the application of pillar nanostructures in organic solar cells (OSCs). The aluminum pillar nanostructures (AlPNSs) are fabricated on an active layer surface comprising of a blend poly(3-hexylthiophene-2,5-diyl) and [6,6]-phenyl C61 butyric acid methyl ester using nanoimprinting. Aluminum back electrodes are formed, resulting in AlPNSs with an imprinted pattern height of 60 ± 6 nm and a pitch of 212 ± 49 nm. Atomic force microscope images and current density versus voltage curves are obtained for the fabricated devices, both with and without AlPNSs. The results indicate a solar cell efficiency increase of 15.16% in the AlPNS OSCs compared to the reference cells. To investigate the role of AlPNSs in the enhancement, impedance spectroscopy, incident photon-to-current efficiency, UV–Vis reflection spectroscopy, and finite-difference time-domain simulations are performed for the both devices. The results demonstrate that the combination of propagating surface plasmon resonance and light-trapping properties due to AlPNSs significantly enhances the overall optical performance. This research provides new insights into the potential of imprinted nanostructures for enhancing OSC performance, including their plasmonic and optical characteristics.

    DOI: 10.1002/pssa.202400221

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  • Plasmonic utilization of silver nanoparticles in PM6:Y7 organic solar cell

    Joseph Baki Kaore, Sachiko Jonai, Akira Baba, Kazunari Shinbo, Keizo Kato

    Molecular Crystals and Liquid Crystals   2024

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    Publishing type:Research paper (scientific journal)  

    Silver nanoparticles (AgNPs) are employed to utilize plasmonic effects in PM6:Y7 organic solar cell. Such enables utilization of wavelengths ranging from 400–490 nm and resonance tuning toward longer wavelengths. Inverted structure is employed with AgNPs incorporated into zinc oxide (ZnO) layer. 5–15% volume ratio concentrations of AgNPs were used. The results obtained indicated a 12.97% power conversion efficiency for AgNPs with 10% concentration in comparison to the device without AgNP incorporation. Finite-difference time-domain method (FDTD) simulation of AgNP indicated forward scattering as the most dominant mechanism for external quantum efficiency (EQE) enhancements for wavelengths ranging from 500-900nm.

    DOI: 10.1080/15421406.2024.2353989

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  • Investigation of the effect of plasmonic Au nanoparticles on crystalline Si solar cells

    Sachiko Jonai, Komei Kobayashi, Kyotaro Nakamura, Atsushi Masuda, Kazunari Shinbo, Keizo Kato, Akira Baba

    Japanese Journal of Applied Physics   63 ( 2 )   02SP15 - 02SP15   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    In order to increase the photocurrent of tandem solar cells with a silicon (Si) solar cell as the bottom cell, we investigate the relationship between the localized surface plasmon resonance effect of gold nanoparticles (AuNPs) and the arrangement of AuNPs onto solar cells. AuNPs were deposited on P-type crystalline Si (c-Si) cells and Si heterojunction (SHJ) type cells. To obtain the localized surface plasmon resonance effect, the shape, size, and arrangement of the nanostructures are important. Especially, arrangement of AuNPs onto solar cells was inquired in this study because these parameters must be adjusted appropriately to produce a plasmon resonance in a specific wavelength range. It was found that the plasmon resonance effect is significant when deposited on the surface of c-Si cell rather than on top of the Ag electrode. AuNPs deposition on the c-Si cell surface leads to not only the localized surface plasmon resonance effect but also improvement in charge transport between the c-Si cell surface and Ag electrode. However, in the SHJ-type cells, the plasmon resonance effect was not observed because the surface layer was composed of a W-doped In<sub>2</sub>O<sub>3</sub> (IWO) layer.

    DOI: 10.35848/1347-4065/ad067a

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    Other Link: https://iopscience.iop.org/article/10.35848/1347-4065/ad067a/pdf

  • Evaluations of ethylene glycol and polyethylene glycol aqueous solutions using a hybrid sensor of surface plasmon resonance and quartz crystal microbalance

    Shuta Katakura, Yuto Tsujisawa, Yasuo Ohdaira, Akira Baba, Keizo Kato, Kazunari Shinbo

    Japanese Journal of Applied Physics   63 ( 1 )   01SP36 - 01SP36   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    A hybrid sensor based on surface plasmon resonance (SPR) and quartz crystal microbalance (QCM) was prepared. One of the electrodes of the QCM sensor had a grating structure to enable SPR excitation. The SPR property was investigated through the transmission of the visible-light spectrum. The theoretical calculation showed that the experimental values almost corresponded to the theoretical ones; this suggests that the transmitted light dips were due to SPR. In order to investigate the usefulness of this hybrid sensor, the characteristics of SPR and the oscillation frequency drops of QCM (ΔF <sub>QCM</sub>) were investigated for aqueous solutions of ethylene glycol and polyethylene glycols with various degrees of polymerization. The position and slope of the SPR dip wavelength and the ΔF <sub>QCM</sub> curves depended on the degree of polymerization, suggesting that the sensor can be used to evaluate a solution property and/or discriminate a solute material.

    DOI: 10.35848/1347-4065/acfeff

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    Other Link: https://iopscience.iop.org/article/10.35848/1347-4065/acfeff/pdf

  • On/Off Ratio of a Pentacene Field-Effect Transistor with a Discontinuous MoO&lt;sub&gt;3&lt;/sub&gt; Layer

    Takumi KOBAYASHI, Masahiro MINAGAWA, Akira BABA, Keizo KATO, Kazunari SHINBO

    IEICE Transactions on Electronics   E106.C ( 6 )   214 - 219   2023.6

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    Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transele.2022omp0001

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  • Plasmonic induced light trapping enhancement in silicon nanowires hybrid solar cell using indium tin oxide nanoparticles

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

    Semiconductor Science and Technology   38 ( 5 )   055002 - 055002   2023.3

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    In this study, silicon nanowires (SiNWs) with different lengths was fabricated using the metal-catalyzed electroless etching method and used as the base structure of an inorganic semiconductor hybrid solar cell. This technique is economically attractive and allows us to easily control the physical nanostructure of the nanowires to match the light trapping mechanism of the 3D-structured hybrid solar cell. The length of the nanowire linearly increases with etching times. For solar cell fabrication, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) was used as an organic semiconductor part. The plasmonic-induced light-trapping enhancement of indium tin oxide nanoparticles (ITO NPs) and gold nanoparticles (AuNPs) mixed with PEDOT:PSS was adapted to improve solar cell performance. It was found that the hybrid solar cell, fabricated from SiNWs with 5 min-etching time, yielded the highest power conversion efficiency (PCE). Furthermore, using ITO NPs and AuNPs in a hole-transport layer of the SiNWs hybrid solar cell can improve the PCE to 50% more than the reference hybrid solar cell. The hybrid solar cell using the concentration between PEDOT:PSS and ITO NPs of 1:1/5 shows the highest PCE of 8.33%.

    DOI: 10.1088/1361-6641/acc128

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    Other Link: https://iopscience.iop.org/article/10.1088/1361-6641/acc128/pdf

  • Plasmonic photothermal properties of silver nanoparticle grating films

    Siriporn Anuthum, Fugo Hasegawa, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato, Kontad Ounnunkad, Akira Baba

    Physical Chemistry Chemical Physics   24 ( 11 )   7060 - 7067   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    A grating structure fabricated by AgNPs strongly enhances electric field intensity in the large area of the film, which results in higher heat generation.

    DOI: 10.1039/d1cp05893b

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  • Tunable surface plasmon resonance enhanced fluorescence <i>via</i> the stretching of a gold quantum dot-coated aluminum-coated elastomeric grating substrate

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

    Analytical Methods   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

    Controlling the fluorescence intensity of AuQDs by shifting the SPR-excitation wavelength was demonstrated by stretching the Al-coated PDMS-grating substrate.

    DOI: 10.1039/d2ay00893a

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  • Evaluation of ultrasonic-atomized rhodamine dye film deposition using an optical waveguide sensor with surface plasmon resonance

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

    Molecular Crystals and Liquid Crystals   727 ( 1 )   15 - 22   2021.9

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/15421406.2021.1946962

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  • 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   2021.7

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    Publishing type:Research paper (scientific journal)   Publisher: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   2021.6

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    Publishing type:Research paper (scientific journal)   Publisher: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   2021.6

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    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 )   2021.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher: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   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher: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   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher: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   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher: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   2020.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher: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   2020.11

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  • Tuning the luminescent intensity by controlling the distance between gold quantum dots and silver nanoprisms

    Wataru Sato, Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    Proceedings of the International Symposium on Electrical Insulating Materials   2020-   451 - 453   2020.9

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    Plasmonic nanostructures can be used to control the photoluminescence properties of several photoluminescence materials. In this work, an efficient plasmon-induced energy transfer (quenching) was investigated. The luminescent intensity of gold quantum dots (AuQDs) was controlled by the localized surface plasmon resonance (LSPR) of silver nanoprisms (AgNPrs). Since the quenching effect of this system depended on the distance between AuQDs and AgNPrs, the difference chain lengths of alkanedithiol molecules were used to control the distance between those nanomaterials. The 69% quenching of AuQDs was observed when 1,6-hexanedithiol-functionalized AgNPrs acted as a quencher. When AgNPrs with a longer chain length of alkanedithiol was used as a quencher, the decrease in quenching efficiency was observed. These were due to the effect of fluorescence resonance energy transfer. This technique was utilized for detection of bovine serum albumin with the detection limit of 10 ng/mL.

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  • Colorimetric probe based on destabilization of silver nanoparticles from polysaccharide matrix for creatinine detection

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    Proceedings of the International Symposium on Electrical Insulating Materials   2020-   35 - 37   2020.9

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    Colorimetric probes for creatinine detection using metal nanoparticles have attracted much attention due to their unique optical properties that could be observed by UV-vis spectrometer or naked eye. In this work, starch-stabilized silver nanoparticles (AgNPs) were adopted for creatine detection. AgNPs were synthesized by chemical technique. Soluble starch was used as a stabilizer. AgNPs could be stabilized in starch due to steric hindrance. Creatinine is a chemical that strongly bind with AgNPs. When creatinine was mixed with starch-stabilized AgNPs, the ligand-exchange reaction of creatinine and hydroxyl groups of starch occurred and AgNPs were destabilized from polysaccharide matrix of starch. After AgNPs were destabilized from starch, free AgNPs were aggregated due to Van der Waals attraction force. Extinction spectrum of AgNP colloidal solution showed a broad spectrum and the color of solution turned to orange. This system is a unique system because the this effect cannot observe from starch-stabilized gold nanoparticles (AuNPs). This work shows a high possibility to utilize AgNPs as a colorimetric probe for blood creatinine and urinary creatinine detections.

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  • 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   2020.7

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    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   2020.7

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    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 Reviewed

    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   2019.11

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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   2019.11

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    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 Reviewed

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

    Japanese Journal of Applied Physics   59 ( SC )   SCCA02 - SCCA02   2019.10

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    DOI: 10.7567/1347-4065/ab4a94

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

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

    Molecular Crystals and Liquid Crystals   688 ( 1 )   89 - 97   2019.10

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

    DOI: 10.1080/15421406.2019.1651073

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

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

    Japanese Journal of Applied Physics   59 ( SC )   SCCA04 - SCCA04   2019.10

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

    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   2019.7

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    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   2019.7

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    © 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 Reviewed

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

    ACS Applied Materials & Interfaces   11 ( 12 )   11954 - 11960   2019.4

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

    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 Reviewed

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

    Analytical Letters   52 ( 12 )   1939 - 1950   2019.4

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

    DOI: 10.1080/00032719.2019.1586913

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

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

    Analytical Sciences   35 ( 3 )   271 - 276   2019.3

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

    DOI: 10.2116/analsci.18P412

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

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

    Plasmonics   15 ( 1 )   3 - 9   2019.3

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

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

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

    IEICE Transactions on Electronics   102 ( 2 )   125 - 131   2019.2

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    DOI: 10.1587/transele.2018OMP0004

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

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

    Molecular Crystals and Liquid Crystals   685 ( 1 )   93 - 99   2019.1

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

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

    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   2019.1

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    DOI: 10.1166/jnn.2019.16704

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

    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

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

    Yasuo Ohdaira, Akira Baba, Kazunari Shinbo, Keizo Kato

    Japanese Journal of Applied Physics   59 ( SC )   SCCC01 - SCCC01   2019

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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

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    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 Reviewed

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

    Plasmonics   13 ( 6 )   2417 - 2421   2018.12

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

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

    MRS Communications   8 ( 3 )   1279 - 1284   2018.9

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

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  • A Smartphone-based surface plasmon resonance platform Reviewed

    Chutiparn Lertvachirapaiboon, Akira Baba, Kazunari Shinbo, Keizo Kato

    Anaytical Methods   10 ( 39 )   4732 - 4740   2018.9

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

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

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

    Biosensors and Bioelectronics   102   267 - 275   2018.4

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    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.

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

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

    MRS Communications   8 ( 1 )   107 - 112   2018.3

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

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

    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   2018.2

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    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.

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

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

    BIOSENSORS & BIOELECTRONICS   99   399 - 415   2018.1

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    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.

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

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

    EFM 2018   2018.1

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

    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)   2018.1

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

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

    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)   2018.1

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

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

    Molecular Crystals and Liquid Crystals   Vol. 660 ( 1 )   156 - 162   2018.1

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

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

    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   2017.12

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

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

    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)   2017.11

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    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 Reviewed

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

    SENSORS AND ACTUATORS B-CHEMICAL   249   39 - 43   2017.10

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    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 Reviewed

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

    ANALYTICAL SCIENCES   33 ( 4 )   443 - 447   2017.4

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

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

    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   2017.4

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    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.

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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 Reviewed

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

    NANOSCALE   9 ( 15 )   4963 - 4971   2017.4

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    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.

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  • High-Performance Organic Devices and Sensors Utilizing Surface Plasmon Excitation Invited Reviewed

    Keizo Kato, Akira Baba, Kazunari Shinbo, Futao Kaneko

    IEICE TRANSACTIONS on Electronics   J100-C ( 3 )   132 - 140   2017.3

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  • Microfluidic transmission surface plasmon resonance enhancement for biosensor applications Reviewed

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 1 )   017002   2017.1

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    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 Reviewed

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

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   19 ( 4 )   2791 - 2796   2017.1

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

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  • 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 Reviewed

    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   2016.11

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

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

    POLYMER BULLETIN   73 ( 9 )   2539 - 2546   2016.9

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

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

    Saengrawee Sriwichai, Paphawadee Netsuwan, Sukon Phanichphant, Akira Baba

    Chiang Mai Journal of Science   Vol. 4   863 - 869   2016.7

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

    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   2016.7

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

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

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

    Japanese Journal of Applied Physics   55 ( 2 )   02BB09   2016.2

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    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.

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

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 2 )   02BB06 (4 pages)   2016.2

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    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 Reviewed

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   55 ( 2 )   02BB09 (5 pages)   2016.2

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    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 Reviewed

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

    EFM 2016   2016.1

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

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

    INTERNATIONAL JOURNAL OF ANALYTICAL CHEMISTRY   2016   Article ID:1432781 (8 pages)   2016

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    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 Reviewed

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

    Molecular Crystals and Liquid Crystals   622 ( 1 )   67 - 73   2015.11

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    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.

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  • Judging degradation of lithium ion batteries using a real-time capacitance measurement Reviewed

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

    IEEJ Transactions on Fundamentals and Materials   135 ( 10 )   624 - 629   2015.10

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

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E98C ( 2 )   98 - 103   2015.2

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

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E98C ( 2 )   136 - 138   2015.2

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

    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   2015.2

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    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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  • 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 Reviewed

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

    INTERNATIONAL JOURNAL OF POLYMER SCIENCE   2015   Article ID: 650516 (7 pages)   2015

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    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 Reviewed

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

    SENSORS AND ACTUATORS B-CHEMICAL   204   770 - 776   2014.12

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

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

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

    SURFACE AND INTERFACE ANALYSIS   46 ( 9 )   607 - 612   2014.9

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    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 Reviewed

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

    PLASMONICS   9 ( 4 )   899 - 905   2014.8

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    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.

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  • Surface Plasmon Spectroscopy Methods and Electrochemical Analysis Reviewed

    Akira Baba, Rigoberto Advincula

    Handbook of Spectroscopy: Second, Enlarged Edition   3-4   1159 - 1178   2014.6

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    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

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

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

    SPRINGERPLUS   3   284(1) - 284(10)   2014.6

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    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 Reviewed

    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

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    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.

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

    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

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    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.

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

    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

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    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.

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

    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

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    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 Reviewed

    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

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

    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   2013.11

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    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.

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

    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   2013.9

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

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

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

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   580 ( 1 )   29 - 34   2013.9

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

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

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

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   580 ( 1 )   7 - 14   2013.9

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    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.

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

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

    PLASMONICS   8 ( 2 )   369 - 375   2013.6

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    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.

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

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

    PLASMONICS   8 ( 2 )   369 - 375   2013.6

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    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.

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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 Reviewed

    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   2013.5

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    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

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E96C ( 3 )   385 - 388   2013.3

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

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

    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   2012.10

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

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

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

    ADVANCED FUNCTIONAL MATERIALS   22 ( 20 )   4383 - 4388   2012.10

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    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.

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

    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   2012.10

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    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.

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

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

    SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY   55 ( 8 )   1351 - 1355   2012.8

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    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 Reviewed

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

    ACS APPLIED MATERIALS & INTERFACES   4 ( 8 )   4270 - 4275   2012.8

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    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.

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

    Guoqian Jiang, Chengyu Huang, Akira Baba, Rigoberto Advincula

    MACROMOLECULAR REACTION ENGINEERING   6 ( 4 )   153 - 159   2012.4

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    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.

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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 Reviewed

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

    APPLIED PHYSICS EXPRESS   5 ( 3 )   2012.3

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

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  • Nano-Structured Organic Devises and Biosensors Utilizing Evanescent Waves and Surface Plasmon Resonance Invited Reviewed

    Futao Kaneko, Akira Baba, Kazunari Shinbo, Keizo Kato

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 12 )   1824 - 1831   2011.12

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

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 12 )   1851 - 1854   2011.12

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    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.

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  • Electrochemical Surface Plasmon Resonance Methods for Polymer Thin Films Reviewed

    Akira Baba, Futao Kaneko, Rigoberto Advincula, Wolfgang Knoll

    Functional Polymer Films   2   723 - 744   2011.6

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    DOI: 10.1002/9783527638482.ch22

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

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

    BIOMICROFLUIDICS   5 ( 2 )   026501-1 - 026501-6   2011.6

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    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]

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

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

    ACS APPLIED MATERIALS & INTERFACES   3 ( 6 )   2080 - 2084   2011.6

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

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

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

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   58 ( 5 )   1402 - 1406   2011.5

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

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

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

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   11 ( 5 )   4289 - 4294   2011.5

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    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.

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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   2011.3

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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   2011.3

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E94C ( 2 )   196 - 197   2011.2

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

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

    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   2011.1

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

    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   2011.1

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

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  • Gold nanoparticles synthesis used for sensor applications Reviewed

    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

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    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 Reviewed

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

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

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

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  • 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

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

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

    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

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    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 Reviewed

    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

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    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   2010.12

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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   2010.12

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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   2010.12

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  • On the Monolayer Adsorption of Thiol-Terminated Dendritic Oligothiophenes onto Gold Surfaces Reviewed

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

    MACROMOLECULAR CHEMISTRY AND PHYSICS   211 ( 24 )   2562 - 2572   2010.12

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    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.

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

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

    LANGMUIR   26 ( 23 )   18476 - 18482   2010.12

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    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.

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

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

    MACROMOLECULAR CHEMISTRY AND PHYSICS   211 ( 24 )   2624 - 2635   2010.12

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    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.

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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   2010.11

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

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

    SSDM 2010   ( A-5-3 )   661 - 662   2010.9

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

    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   2010.9

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

    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   2010.9

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    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.

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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   2010.8

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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   2010.8

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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   2010.8

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  • Electrochemical Surface Plasmon Resonance and Waveguide-Enhanced Glucose Biosensing with N-Alkylaminated Polypyrrole/Glucose Oxidase Multilayers Reviewed

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

    ACS APPLIED MATERIALS & INTERFACES   2 ( 8 )   2347 - 2354   2010.8

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    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.

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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   2010.7

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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   2010.7

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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   2010.7

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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   2010.6

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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   2010.6

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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   2010.6

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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   2010.6

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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   2010.6

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

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

    SENSORS AND ACTUATORS B-CHEMICAL   147 ( 1 )   322 - 329   2010.5

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    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.

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  • Evaluation of the Alignment of Liquid Crystal Molecules on SiO<sub>2</sub> Alignment Layer by Attenuated Total Reflection Method Utilizing Surface Plasmon and Guided Wave Excitation Modes

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

    IEEJ Transactions on Fundamentals and Materials   130 ( 2 )   219 - 220   2010.2

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    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   2010.2

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  • Structure of Polymer Fibers Fabricated by Electrospinning Method Utilizing a Metal Wire Electrode in a Capillary Tube

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

    IEEJ Transactions on Fundamentals and Materials   130 ( 2 )   193 - 197   2010.2

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

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

    THIN SOLID FILMS   518 ( 8 )   2200 - 2205   2010.2

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    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.

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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 Reviewed

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

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   519   128 - 133   2010

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

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

    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

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    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 Reviewed

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

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

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    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 Reviewed

    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

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    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

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

    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

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    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.

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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   2009.11

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

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

    THIN SOLID FILMS   518 ( 2 )   758 - 761   2009.11

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    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 Reviewed

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

    THIN SOLID FILMS   518 ( 2 )   629 - 633   2009.11

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    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.

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  • Surface Plasmon Resonance Sensor Using Grating Coupling Multimode Excitations Reviewed

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

    SSDM 2009   ( P-10-22 )   659 - 660   2009.10

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

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

    SSDM 2009   ( F-8-4 )   1172 - 1173   2009.10

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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   2009.8

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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 )   2009.8

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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   2009.8

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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   2009.8

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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   2009.7

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    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   2009.5

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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   2009.2

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  • Micro/nanopatterning of single-walled carbon nanotube-organic semiconductor composites Reviewed

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

    NANOTECHNOLOGY   20 ( 8 )   85301-1 - 85301-6   2009.2

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    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   2009.1

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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   2009.1

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

    Xinheng Li, Kaoru Tamada, Akira Baba, Masahiko Hara

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   9 ( 1 )   408 - 416   2009.1

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    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 Reviewed

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

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

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    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 Reviewed

    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

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    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   2008.12

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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   2008.12

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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   2008.12

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 12 )   1883 - 1884   2008.12

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    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 Reviewed

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

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 12 )   1881 - 1882   2008.12

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    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   2008.11

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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   2008.10

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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   2008.10

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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   2008.10

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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   2008.10

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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   2008.10

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

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

    IEICE TRANSACTIONS ON ELECTRONICS   E91C ( 10 )   1663 - 1668   2008.10

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    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.

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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   2008.9

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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   2008.9

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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   2008.8

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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   2008.8

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

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

    CHEMISTRY OF MATERIALS   20 ( 15 )   4915 - 4924   2008.8

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    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 Reviewed

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

    LANGMUIR   24 ( 16 )   9017 - 9023   2008.8

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    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.

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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   2008.7

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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   2008.7

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  • Hybrid CdSe nanoparticle-carbazole dendron boxes: Electropolymerization and energy-transfer mechanism shift Reviewed

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

    ADVANCED FUNCTIONAL MATERIALS   18 ( 14 )   2071 - 2078   2008.7

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    Carbazole containing ligand dendrons are designed based on second generation polybenzyl ether dendrons (2GPO). This is subsequently used for directly synthesizing and capping CdSe nanoparticles in contrast to ligand exchange for introducing functionality. The stable hybrid CdSe-2GPO quantum dot nanoparticles have characteristic energy-transfer properties from the donor carbazole peripheral groups to the acceptor CdSe nanoparticles, i.e., overlap of the fluorescence of the carbazole with the absorbance of the CdSe nanoparticle resulting in an enhanced fluorescence with concentration through F6rster resonance energy transfer (FRET). However, electropolymerization of the peripheral electroactive carbazole units result in a red-shift in absorbance and quenching in fluorescence. This is attributed to a reversed molecular orbital energy order with respect to the electropolymerized carbazole dendron and CdSe nanoparticle. The hole-transfer results in fluoresence quenching and charge transfer between the CdSe nanoparticles and the polycarbazole peripheral units. The photoelectric alteration may yet provide for an interesting electro-optical or sensing device application based on electrochemical properties of the hybrid material.

    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   2008.6

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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   2008.6

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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   2008.5

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

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 2 )   1110 - 1114   2008.2

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    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 Reviewed

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 1 )   484 - 487   2008.1

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    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 Reviewed

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

    ADVANCED FUNCTIONAL MATERIALS   18 ( 2 )   347 - 354   2008.1

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    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 Reviewed

    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

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

    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

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    DOI: 10.1109/ISEIM.2008.4664451

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

    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

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  • Evaluation of surface alignment of LC using surface plasmon resonance spectroscopy and waveguide mode

    A. Ikarashi, A. Baba, K. Shinbo, K. Kato, F. Kaneko

    IDW '08 - Proceedings of the 15th International Display Workshops   1   33 - 36   2008

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    In tills study, we report on the evaluation of tilt angles of LC molecules near the surface of SiO2 alignment layers and in the whole cell when constant voltages are applied. Surface plasmon resonance spectroscopy and waveguide mode in attenuated total reflection configuration are used to monitor the property of LC molecules orientation on the surface and the bulk.

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  • SPR-based DNA detection with metal nanoparticles Reviewed

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

    PLASMONICS   2 ( 4 )   185 - 191   2007.12

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    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   2007.9

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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   2007.9

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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   2007.9

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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   2007.9

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

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

    SSDM 2007   ( H-I-3 )   176 - 177   2007.9

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

    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   2007.8

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    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.

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

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

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   234   2007.8

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  • Ultrathin conjugated polymer network films of carbazole functionalized poly(p-phenylenes) via electropolymerization Reviewed

    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   2007.6

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    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.

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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 Reviewed

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

    Langmuir   Vol. 23   908 - 917   2007.1

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    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 Reviewed

    Guoqian Jiang, Akira Baba, Rigoberto Advincula

    Langmuir   Vol. 23   817 - 825   2007.1

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  • Signal Enhancement and Tuning of Surface Plasmon Resonance: ATR Spectroscopy and Imaging of Hybrid Gold Nanoparticles/Polyelectrolytes Ultrathin Films Reviewed

    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

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    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 Reviewed

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

    ADVANCED FUNCTIONAL MATERIALS   16 ( 15 )   2000 - 2007   2006.10

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    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.

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

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

    JOURNAL OF PHYSICAL CHEMISTRY B   110 ( 35 )   17309 - 17314   2006.9

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    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.

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

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

    JOURNAL OF PHYSICAL CHEMISTRY B   110 ( 32 )   15755 - 15762   2006.8

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    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.

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

    A Baba, W Knoll, R Advincula

    REVIEW OF SCIENTIFIC INSTRUMENTS   77 ( 6 )   064101-1 - 064101-6   2006.6

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    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.

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

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

    MACROMOLECULES   39 ( 4 )   1467 - 1473   2006.2

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    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 Reviewed

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

    The Journal of Physical Chemistry B   Vol. 110   42 - 45   2006.1

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

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

    POLYMER   46 ( 15 )   5556 - 5568   2005.7

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    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 Reviewed

    P Taranekar, A Baba, TM Fulghum, R Advincula

    MACROMOLECULES   38 ( 9 )   3679 - 3687   2005.5

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    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 Reviewed

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

    SENSORS AND ACTUATORS B-CHEMICAL   105 ( 2 )   532 - 541   2005.3

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    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 Reviewed

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

    Journal of the American Chemical Society   Vol. 127   1744 - 1751   2005.2

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    DOI: 10.1021/ja046144l

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

    A Baba, K Onishi, W Knoll, RC Advincula

    JOURNAL OF PHYSICAL CHEMISTRY B   108 ( 49 )   18949 - 18955   2004.12

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    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 Reviewed

    A Baba, G Kleideiter, T Jakob, W Knoll

    MACROMOLECULAR CHEMISTRY AND PHYSICS   205 ( 17 )   2267 - 2274   2004.11

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    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.

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

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

    CHEMISTRY OF MATERIALS   16 ( 24 )   5187 - 5193   2004.11

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    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%.

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

    CJ Xia, RC Advincula, A Baba, W Knoll

    CHEMISTRY OF MATERIALS   16 ( 15 )   2852 - 2856   2004.7

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    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.

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  • Electrical properties and gas response in alternate layer-by-layer films of copper phthalocyanine dyes Reviewed

    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   2004.4

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    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.

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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 Reviewed

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

    JOURNAL OF ELECTROANALYTICAL CHEMISTRY   562 ( 1 )   95 - 103   2004.1

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    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.

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

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

    Molecular Crystals and Liquid Crystals   407   105 - 113   2003.12

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    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 Reviewed

    A Baba, J Lubben, K Tamada, W Knoll

    LANGMUIR   19 ( 21 )   9058 - 9064   2003.10

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    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.

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  • Attenuated total reflection and emission due to surface plasmon excitation of layer-by-layer ultrathin films containing azo-dye Reviewed

    K Kato, J Kawashima, A Baba, K Shinbo, F Kaneko, RC Advincula

    THIN SOLID FILMS   438   101 - 107   2003.8

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    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 Reviewed

    A Baba, W Knoll

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 31 )   7733 - 7738   2003.8

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    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) Reviewed

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

    JOURNAL OF PHYSICAL CHEMISTRY B   107 ( 28 )   6743 - 6747   2003.7

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    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.

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  • Electrochemical growth of dendritic conducting polymer networks Reviewed

    A Baba, W Knoll

    ADVANCED MATERIALS   15 ( 12 )   1015 - +   2003.6

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    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.

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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 Reviewed

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

    Advanced Functional Materials   Vol. 13   473 - 479   2003.6

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  • Evaluation of Structure and Emission Property of Alternate Self-Assembled Ultrathin Films Containing Azo-Dye by Surface Plasmon Excitation Method Reviewed

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

    Transactions of Materials Research Society of Japan   28 ( 1 )   43 - 46   2003.3

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

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

    Langmuir   19 ( 3 )   654 - 665   2003.2

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    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.

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

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

    Langmuir   Vol. 19   654 - 665   2003.2

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    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 Reviewed

    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   2002.12

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    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.

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

    A Baba, MK Park, RC Advincula, W Knoll

    LANGMUIR   18 ( 12 )   4648 - 4652   2002.6

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    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.

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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) Reviewed

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

    Langmuir   Vol. 18   3555 - 3560   2002.4

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  • Alignments of nematic liquid crystal molecules on azo-dye-containing alternate self-assembled films investigated using attenuated total reflection method Reviewed

    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   2002.4

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    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 Reviewed

    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   2002.2

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  • Photo-induced fabrication of surface relief gratings in alternate self-assembled films containing azo dye and alignments of LC molecules Reviewed

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

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   198   805 - 810   2002.2

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    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.

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

    A Baba, RC Advincula, W Knoll

    JOURNAL OF PHYSICAL CHEMISTRY B   106 ( 7 )   1581 - 1587   2002.2

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    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 Reviewed

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

    Colloids and Surfaces A   Vols 198-200   905 - 909   2002.2

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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 Reviewed

    K Shinbo, J Ishikawa, A Baba, F Kaneko, K Kato, RC Advincula

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   370   193 - 196   2001

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    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 Reviewed

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi, Rigoberto C. Advincula

    Molecular Crystals and Liquid Crystals   Vol.347   15 - 24   2000.12

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  • Polyelectrolyte adsorption processes characterized in situ using the quartz crystal microbalance technique: alternate adsorption properties in ultrathin polymer films Reviewed

    A Baba, F Kaneko, RC Advincula

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   173 ( 1-3 )   39 - 49   2000.11

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    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.

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  • Photo-induced alignments of liquid crystal molecules on alternate self-assembly films evaluated by the attenuated total reflection measurement Reviewed

    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

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    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 Reviewed

    K Shinbo, A Baba, H Tsuruta, T Ebe, F Kaneko, K Kato, T Wakamatsu

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS   349   231 - 234   2000

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    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.

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  • Photo-induced properties of liquid crystal molecules on alternately assembled charged azobenzene dyes and polyelectrolyte films using attenuated total reflection method

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

    Materials Research Society Symposium - Proceedings   598   BB11.4.6   2000

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    In this report, we describe the photo-induced in-plane alignment of nematic liquid crystal (LC) molecules, 5CB, in a hybrid cell with alternate self-assembled films of low-molecular weight azobenzene dye and polyelectrolyte on gold electrodes using the attenuated total reflection (ATR) measurement method. The molecular self-assembly process was also investigated by the ATR method. Reflectivities due to excitations of the surface plasmon polariton (SPP) were observed in the ATR properties of the LC cell. In plane switching of the LC molecules adjacent to the aligning layer was evaluated from the ATR curves after irradiation of linearly polarized visible light to the LC cell. The sensitivity of the ATR method gives information on the alignment, tilt angle, and extent of LC reorientation in the bulk. Thus, the importance of using the molecular self-assembly processes of individual polyion-dye pairs for fabrication of new photo-aligning layers is emphasized.

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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 Reviewed

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

    Materials Science & Engineering C   Vols. 8-9   145 - 150   1999.12

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  • An Evaluation of Liquid Crystal Molecules on Polyimide Langmuir Blodgett Films in the Thick Cell using the Attenuated Total Reflection Method Reviewed

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

    IEEJ Transactions on Fundamentals and Materials   119 ( 1 )   124 - 129   1999.1

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  • Photo-Induced Alignment of Liquid Crystal Molecules on Alternate Self-Assembly Polymer Films Containing Azobenzene Evaluated by Attenuated Total Reflection Measurement

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

    Proceedings of Japanese Liquid Crystal Society Annual meeting   1999   94 - 95   1999

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    Photo-induced in-plane alignments of the nematic liquid crystal (LC) molecule, 5CB, have been investigated in the cell with alternate layer-by-layer films of polyelectrolyte and low-molecular weight dyes on the gold electrodes using the attenuated total reflection (ATR) measurement method. Direct red 80 (DR80), azo dye, was employed as an anion; poly(diallyldimethylammonium chloride) (PDADMAC) was used as a polycation. The surface plasmon polaritoh (SPP) was observed in the ATR curves of the LC cells. The properties were sensitively changed by re-orientations of the LC molecules by means of the irradiation of the linearly polarized visible light to the LC cell. In-plane alignments of the LC molecules adjacent to the aligning layer were evaluated by fitting the theoretical ATR curves to the experimental ones.

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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 Reviewed

    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   1998.5

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    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.

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  • Evaluation of liquid crystal molecules on polyimide LB films using attenuated total reflection measurement Reviewed

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi

    Thin Solid Films   327-329 ( 1-2 )   353 - 356   1998

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    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 Reviewed

    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

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    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.

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  • Temperature and voltage dependence of attenuated total reflection properties of liquid crystal molecules on the LB films Reviewed

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

    1998 INTERNATIONAL SYMPOSIUM ON ELECTRICAL INSULATING MATERIALS, PROCEEDINGS   591 - 594   1998

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    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.

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  • A Measurement of Liquid Crystal Molecules on Polyimide LB Alignment Films Using The Attcnuated Total Reflection Mcthod Reviewed

    Akira Baba, Futao Kaneko, Kazunari Shinbo, Keizo Kato, Satoshi Kobayashi

    IEEJ Transactions on Fundamentals and Materials   117 ( 12 )   1233 - 1238   1997.12

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    DOI: 10.1541/ieejfms1990.117.12_1233

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  • 「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( Role: Contributor ,  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  2014.4 

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

    Akira Baba, Rigoberto Advincula( Role: Contributor ,  Chapter 9-1,Surface Plasmon Spectroscopy Methods and Electrochemical Analysis, pp.1161-1178)

    Wiley-VCH Verlag GmbH  2014.4 

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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( Role: Contributor ,  pp52-56)

    「月刊 研究開発リーダー」技術情報協会  2013.4 

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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( Role: Contributor ,  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)

    2013.4 

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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( Role: Contributor ,  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  2012.5 

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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( Role: Contributor ,  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  2012.3 

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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( Role: Joint author ,  Chapter 7, "Assembly and Patterning of Single-Walled Carbon Nanotubes/Organic Semiconductors" pp.111-124)

    Intech  2011 

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

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

    Wiley-VCH  2011 

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  • Biosensor Device with SPR Imaging Technique: The Design of High Density DNA Bio-tip

    Kaoru Tamada, Masateru Ito, Fumio Nakamura, Akira Baba( Role: Joint author)

    Surface Science Society  2006.1 

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  • Electrochemical Surface Plasmon Resonance Technique for In-situ Investigation of Conducting Polymer Ultrathin Films and Their Sensor Application

    Akira Baba, Rigoberto Advincula, Wolfgang Knoll( Role: Joint author)

    Japanese Applied Physics Society  2005.12 

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  • Novel Methods to Study Interfacial Layers

    Akira Baba, Rigoberto C. Advincula, Wolfgang Knoll( Role: Joint author ,  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  2001.12 

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  • Evaluation of Organic Thin Films Utilizing Surface Plasmon Excitation

    Akira Baba, Futao Kaneko, Rigoberto C. Advincula, Wolfgang Knoll( Role: Joint author)

    Japanese Applied Physics Society  2000.12 

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  • Gold nanostructures/quantum dots for the enhanced efficiency of organic solar cells

    Apichat Phengdaam, Sopit Phetsang, Sachiko Jonai, Kazunari Shinbo, Keizo Kato, Akira Baba

    Nanoscale Advances   6 ( 14 )   3494 - 3512   2024.5

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    Incorporating gold nanoparticles (AuNPs) into organic solar cell (OSC) structures provides an effective means to manipulate light-matter interactions. AuNPs have been used as plasmonic-enhancement and light-trapping materials in OSCs and exhibit diverse single and mixed morphologies. Substantial near-field enhancement from metal periodic structures has consistently demonstrated high enhancement in solar cell efficiency. Additionally, coupling with atomic gold clusters in the form of gold quantum dots holds promise for light harvesting through fluorescence phenomena. The configured devices optimize light utilization in OSCs by considering factors such as the morphology, position, and hybridization of localized surface plasmon resonance, propagating surface plasmon resonance, and fluorescence phenomena. This optimization enhances light absorption, scattering, and efficient trapping facilitated by gold nanostructures/quantum dots. The configured setup exhibits multiple effects, concurrently improving plasmonic and fluorescence responses under solar irradiation, thereby enhancing energy conversion performance. Integrating plasmonic nanostructures with OSCs can address fundamental issues, providing opportunities to enhance the light-absorption intensity and charge transfer efficiency at intra and intermolecular levels. This comprehensive review demonstrates that the greatest improvement in solar cell efficiency exceeded 30% compared with the reference cells.

    DOI: 10.1039/d4na00016a

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  • Photoconductivity Enhancement of Pentacene Thin Film Utilizing Grating-coupled Surface Plasmon Resonance

    竹中大樹, 堀内海里, 皆川正寛, 大平泰生, 馬場暁, 加藤景三, 新保一成

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   82nd   2021

  • Preparation of Sensitive Organic Phototransistor Utilizing Surface Plasmon Resonance

    大桃直剛, 竹中大樹, 皆川正寛, LERTVACHIRAPAIBOON C., 大平泰生, 馬場暁, 加藤景三, 新保一成

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   68th   2021

  • Optical properties and its use for photothermal conversion of moth-eye / metal structures

    巻野晋太郎, LERTVACHIRAPAIBOON C., 大平泰生, 馬場暁, 加藤景三, 新保一成

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   67th   2020

  • Fabrication of quartz crystal microbalance / localized surface plasmon hybrid sensor and moisture absorption evaluation of PVA thin film

    亀井翼, 小松蒋太郎, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 新保一成, 加藤景三

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2020   2020

  • High Performance Organic Phototransistor Utilizing Grating Coupled Surface Plasmon Excitation

    新保一成, 竹中大樹, 大桃直樹, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 加藤景三

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2020   2020

  • Evaluation of Thin Film Structure Using a Combination System of Atomic Force Microscope and Waveguide-based Surface Plasmon Resonance Spectroscopy

    浪岡俊輔, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 新保一成, 加藤景三

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2020   2020

  • Optical properties of metal film on moth-eye structure and application to photo-thermoelectric conversion

    巻野晋太郎, 神山達哉, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 加藤景三, 新保一成

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2020   2020

  • Evaluation of Vapor Sorption Using Hybrid Sensor of Quartz Crystal Microbalance and Surface Palsmon Resonance

    新保一成, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 加藤景三

    電子情報通信学会技術研究報告   119 ( 233(OME2019 17-21) )   2019

  • 長距離伝搬表面プラズモン共鳴を用いたアゾ色素の光異性化と透過光特性

    加藤景三, 中條博史, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 新保一成

    電子情報通信学会大会講演論文集(CD-ROM)   2019   2019

  • 水晶振動子微量天秤・透過型表面プラズモン共鳴複合センサによるグリセリン水溶液評価

    星井歩夢, 亀井翼, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 新保一成, 加藤景三

    電気学会全国大会講演論文集(CD-ROM)   2019   2019

  • 水晶振動子および表面プラズモン共鳴を用いた複合センサの作製と薄膜・溶液評価

    新保一成, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 加藤景三

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2019   2019

  • 円筒誘電体表面上への液晶ドロップレットの形成と光学特性

    長瀬朝, 岡寿樹, 馬場暁, 新保一成, 大平泰生

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   79th   2018

  • 長距離伝搬表面プラズモン励起を用いたアゾベンゼン薄膜異性化の増強と光透過特性

    中條博史, LERTVACHIRAPAIBOON C., 大平泰生, 馬場暁, 新保一成, 加藤景三

    電気学会全国大会講演論文集(CD-ROM)   2018   2018

  • Photoisomerization of Azo Dye Induced by Grating-Coupled Long-Range Surface Plasmon Resonance

    新保一成, 中條博史, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 加藤景三

    電子情報通信学会技術研究報告   118 ( 146(OME2018 9-13) )   2018

  • Surface Plasmon Transmission Light in Organic Thin Films on Metal Grating and Application to High-Sensitivity Sensors

    117 ( 334 )   59 - 64   2017.12

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  • Hybrid Adsorption Sensor Utilizing Waveguide Surface Plasmon Resonance and Quartz Crystal Microbalance

    117 ( 163 )   37 - 40   2017.7

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  • Hybrid Adsorption Sensor Utilizing Waveguide Surface Plasmon Resonance and Quartz Crystal Microbalance

    2017 ( 72 )   37 - 40   2017.7

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  • Humidity and Ammonia Gas Sensing by Using Optical Waveguide Surface Plasmon Resonance Sensor

    2017 ( 63 )   17 - 20   2017.6

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  • Humidity and Ammonia Gas Sensing by Using Optical Waveguide Surface Plasmon Resonance Sensor

    2017 ( 1 )   17 - 20   2017.6

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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   2017.6

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  • Fabrication of Metallic Nanostructured Plasmonic Organic Solar Cells

    117 ( 91 )   29 - 32   2017.6

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  • Fabrication of Metallic Nanostructured Plasmonic Organic Solar Cells

    117 ( 93 )   29 - 32   2017.6

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  • Fabrication of Metallic Nanostructured Plasmonic Organic Solar Cells

    117 ( 92 )   29 - 32   2017.6

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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   2017.5

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  • Fabrication and Evaluation of Plasmonic Metal/Organic Thin Film Structures

    2017 ( 14 )   11 - 14   2017.2

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  • Invited Talk : High-Function and High-Performance Organic Sensors Utilizing Surface Plasmon Excitation

    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   2017.1

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  • Investigation of Gold Quantum Dots/Plasmonic Systems for Improvement of Organic Solar Cells

    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   2017.1

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  • モスアイ構造上金属蒸着薄膜の光学特性の検討

    反町亮太, 加藤和馬, LERTVACHIRAPAIBOON C., 大平泰生, 馬場暁, 加藤景三, 新保一成, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   78th   2017

  • 透過型表面プラズモン共鳴分光法によるアンモニアガスセンシング

    加藤景三, 西川峻成, 高野智弘, LERTVACHIRAPAIBOON Chutiparn, 大平泰生, 馬場暁, 新保一成, 金子双男

    電子情報通信学会大会講演論文集(CD-ROM)   2017   2017

  • アゾ薄膜の表面改質を用いたマイクロ液滴形状の光操作

    三賀崇広, 新保一成, 馬場暁, 大平泰生

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   78th   2017

  • 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   2016.8

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  • Investigation of Transmission Light Induced by Grating-Coupled Long-Range Surface Plasmon Resonance and Its Use for Sensors

    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   2016.7

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  • C-13-3 TRANSMISSION SURFACE PLASMON RESONANCE BASED MICROFLUIDIC PLATFORM FOR BIOSENSOR APPLICATIONS

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

    Proceedings of the IEICE General Conference   2016 ( 2 )   116 - 116   2016.3

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  • Evaluation of Molecular Adsorption using Optical Waveguide Spectroscopy with Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance (誘電・絶縁材料 電子材料合同研究会 エレクトロニクスおよびフォトニクス先端ナノ材料・デバイス)

    SHINBO Kazunari, OHDAIRA Yasuo, BABA Akira, KATO Keizo, KANEKO Futao

    電気学会研究会資料. EFM   2016 ( 2 )   11 - 14   2016.1

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  • Mircrofluidic Based Transmismission Surface Plasmon Resonance for Biosensor Applications (誘電・絶縁材料 電子材料合同研究会 エレクトロニクスおよびフォトニクス先端ナノ材料・デバイス)

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

    電気学会研究会資料. EFM   2016 ( 2 )   25 - 28   2016.1

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  • Surface Plasmon Resonance Based Sensor/Device Applications

    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   2016.1

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  • プラズモニック逆型有機薄膜太陽電池における酸化チタン膜の膜厚依存性の評価

    原一馬, LERTVACHIRAPAIBOON Chutiparn, 石川亮佑, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   77th   2016

  • C-13-1 Transmission Light Induced by Long Range Surface Plasmon Resonance by Using Grating Coupling

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

    Proceedings of the Society Conference of IEICE   2015 ( 2 )   74 - 74   2015.8

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  • Improvement of on/off ratio in carrier generating organic field-effect transistor by using oblique deposition

    115 ( 163 )   29 - 32   2015.7

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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   2015.7

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  • Fabrication of Metallic Nanostructured Plasmonic Organic Solar Cells

    BABA Akira, SHINBO Kazunari, KATO Keizo, KANEKO Futao

    Technical report of IEICE. OME   114 ( 516 )   17 - 20   2015.3

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    Multiple plasmonic structures have been a great deal of interest in fabricating electric-field enhanced organic device applications such as biosensors and photovoltaic devices. In this work, we investigated the grating-coupled SPR enhanced organic solar cell fabricated via nanoimprinting technique. The common type organic solar cell with poly(3-hexylthiophene-2,5-diyl) (P3HT) as an electron donor and phenyl-C_&lt;61&gt;-butyric acid methyl ester (PCBM) as an electron accepter was fabricated. The grating pattern was created on top of the active layer, followed by thermal evaporation of Al as a back electrode. Moreover, we studied the enhancement of the photocurrent of organic solar cell with grating pattern, compared to those of without grating structure. This could be artributed to the effect of grating-coupled SPR (GC-SPR) and light scattering ability of Al grating back electrode. The photocurrents were measured with alternative illumination of the p- and s-polarized light. The results show that the grating-coupled SPR of Al back electrode can enhance the photocurrent of the solar cell. Further results will be presented in the conference.

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  • CS-4-2 Development of High-Performance Organic Sensors Utilizing Surface Plasmon Resonance

    Kato Keizo, Baba Akira, Shinbo Kazunari, Kaneko Futao

    Proceedings of the IEICE General Conference   2015 ( 2 )   "S - 16"-"S-17"   2015.2

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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

    Proceedings of the IEICE General Conference   2015 ( 2 )   110 - 110   2015.2

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  • In-situ Evaluation of Electrolyte Layer-by-layer Film Deposition by Using Optical Waveguide Spectroscopy with Surface Plasmon Resonance

    新保一成, 石郷岡誠, 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   115 ( 68(OME2015 18-23) )   2015

  • 表面プラズモン増強電界によるアゾベンゼン光異性化を用いた透過型表面プラズモン励起特性変化

    太田厳之, 桑原尚希, 馬場暁, 大平泰生, 新保一成, 加藤景三, 金子双男

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   62nd   2015

  • 光導波路分光法を用いたAlcian blue/PSS交互吸着膜の堆積その場観察

    新保一成, 門脇直哉, 石郷岡誠, 大平泰生, 馬場暁, 加藤景三, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   76th   2015

  • CS-2-5 Fabrication of Multiple Plasmons Enhanced Photo-electric Conversion Devices

    Baba Akira, Nootchanat Supeera, Ekgasit Sanong, Shinbo Kazunari, Kato Keizo, Kaneko Futao

    Proceedings of the Society Conference of IEICE   2014 ( 2 )   "S - 8"-"S-9"   2014.9

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  • CS-2-4 In-situ Evaluation of Layer-by-layer Film Depositions by Hybrid Sensors Utilizing Surface Plasmon Resonance Spectroscopy

    Kato Keizo, Baba Akira, Shinbo Kazunari, Kaneko Futao

    Proceedings of the Society Conference of IEICE   2014 ( 2 )   "S - 6"-"S-7"   2014.9

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  • In-situ Evaluation of Layer-by-layer Deposited Films Using a Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance Hybrid Sensor

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

    IEICE technical report. EMD   114 ( 94 )   17 - 20   2014.6

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    A hybrid sensor of quartz-crystal-microbalance and surface-plasmon-resonance was prepared by using an AT-cut quartz substrate as an optical waveguide and by exciting surface plasmon at the surface of the QCM metal electrode. In-situ evaluation of cationic poly(allylamine hydrochloride) (PAH) and anionic poly(styrenesulfonate) (PSS) layer-by-layer film deposition was conducted. The estimated thickness of the deposited film from the SPR result tends to be smaller than that from the QCM result and remarkable difference was observed for the result obtained using aqueous solution of pH 2.5. It was estimated that amino group of PAH was ionized at low pH solution and it induced repulsion between the polymer chain; the polymer film swelled and mass of sorbed water was detected.

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  • In-situ Evaluation of Layer-by-layer Deposited Films Using a Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance Hybrid Sensor

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

    IEICE technical report. Component parts and materials   114 ( 95 )   17 - 20   2014.6

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    A hybrid sensor of quartz-crystal-microbalance and surface-plasmon-resonance was prepared by using an AT-cut quartz substrate as an optical waveguide and by exciting surface plasmon at the surface of the QCM metal electrode. In-situ evaluation of cationic poly(allylamine hydrochloride) (PAH) and anionic poly(styrenesulfonate) (PSS) layer-by-layer film deposition was conducted. The estimated thickness of the deposited film from the SPR result tends to be smaller than that from the QCM result and remarkable difference was observed for the result obtained using aqueous solution of pH 2.5. It was estimated that amino group of PAH was ionized at low pH solution and it induced repulsion between the polymer chain; the polymer film swelled and mass of sorbed water was detected.

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  • In-situ Evaluation of Layer-by-layer Deposited Films Using a Quartz-Crystal-Microbalance and Surface-Plasmon-Resonance Hybrid Sensor

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

    Technical report of IEICE. OME   114 ( 96 )   17 - 20   2014.6

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    A hybrid sensor of quartz-crystal-microbalance and surface-plasmon-resonance was prepared by using an AT-cut quartz substrate as an optical waveguide and by exciting surface plasmon at the surface of the QCM metal electrode. In-situ evaluation of cationic poly(allylamine hydrochloride) (PAH) and anionic poly(styrenesulfonate) (PSS) layer-by-layer film deposition was conducted. The estimated thickness of the deposited film from the SPR result tends to be smaller than that from the QCM result and remarkable difference was observed for the result obtained using aqueous solution of pH 2.5. It was estimated that amino group of PAH was ionized at low pH solution and it induced repulsion between the polymer chain; the polymer film swelled and mass of sorbed water was detected.

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  • Invited Talk : Excitation of Surface Plasmon Resonance in Nanostructured Organic Films and Application to High-Performance Devices and Sensors

    Kato Keizo, Baba Akira, Shinbo Kazunari, Kaneko Futao

    Technical report of IEICE. OME   113 ( 461 )   23 - 28   2014.3

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    Center for Transdisciplinary Research, Niigata University Organic films are actively studied toward the development of high-performance device and sensors. We have performed various kinds of studies about evaluation of nanostructured organic films and application to devices and sensors utilizing the excitation of surface plasmon resonance (SPR) so far. In this paper, we report high-performance devices and sensors utilizing the excitation of SPR. Organic solar cells utilizing grating coupling SPR, SPR sensors combined with optical waveguide (OWG) spectroscopy, transmission SPR sensors and long-range SPR sensors are overviewed.

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  • C-13-1 Surface Plasmon Enhanced Dye-Sensitized Solar Cells Using Grating Structure of Solid Electrolyte on TiO2 Film with Metal Nanoparticles

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

    Proceedings of the IEICE General Conference   2014 ( 2 )   118 - 118   2014.3

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  • 液晶媒質中におけるローダミン分子の物質移動制御の検討

    沓澤崇之, 大平泰生, 新保一成, 馬場暁, 加藤景三, 金子双男

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   61st   2014

  • 純水を用いた液晶媒質のナノ構造形成

    高根沢靖之, 大平泰生, 新保一成, 馬場暁, 加藤景三, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   75th   2014

  • Fabrication of Electrospun Nanofibers and Application to Long Range Surface Plasmon Biosensors

    Kato Keizo, Baba Akira, Shinbo Kazunari, Kaneko Futao

    Proceedings of the Society Conference of IEICE   2013 ( 2 )   "S - 5"-"S-6"   2013.9

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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   2013.9

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  • Fabrication and Photocurrent Properties of Gold Nanoparticle-Decorated TiO_2 Nanocomposites Films

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

    Technical report of IEICE. OME   113 ( 42 )   13 - 16   2013.5

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    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 Evaluation of Organic Dye Film Deposition Using a Hybrid Sensorof Surface Plasmon Resonance and Optical Waveguide Spectroscopy

    Shinbo K, Oshikane H., Yokoyama S., Ohira Y, Baba A, Kato K., Kaneko F

    Proceedings of the IEICE General Conference   2013 ( 2 )   "S - 27"-"S-28"   2013.3

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  • C-13-10 Evaluation of Lead Phthalocyanine Vacuum Evaporated Filmusing optical waveguide and Quartz crystal Microbalance sensor

    Uno A., Hirakawa R., Ohira Y., Baba A., Shinbo K., Kato K, Kaneko F.

    Proceedings of the IEICE General Conference   2013 ( 2 )   153 - 153   2013.3

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  • Evaluation of Thin Film Deposition by a Hybrid Sensor of Surface Plasmon Resonance and Optical Waveguide Spectroscopies

    KATO Keizo, YOKOYAMA Shinji, OSHIKANE Hiroki, SHINBO Kazunari, BABA Akira, KANEKO Futao

    2013 ( 1 )   21 - 24   2013.1

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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

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  • 多チャンネル表面プラズモン共鳴導波路センサによる水蒸気・アンモニア同時測定

    本多浩気, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   60th   2013

  • ナノ液滴における光近接場励起の観測

    関貴紀, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   60th   2013

  • 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光学特性評価

    平川諒, 鵜野成博, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   2013

  • エレクトロスプレーを用いた液晶ナノドロップレット生成と配列制御

    仲澤拓弥, 沓澤崇之, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   2013

  • Controlling Surface Plasmon Optical Transmission Using Conducting Polymer Thin Films

    FUKAYA Mikito, BABA Akira, SHINBO Kazunari, KATO Keizo, KANEKO Futao

    Technical report of IEICE. OME   112 ( 244 )   27 - 30   2012.10

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    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 film-gold 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. Furthermore, the T-SPR signal was further enhanced by incorporating gold nanoparticles in the PEDOT films.

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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   1   125 - 126   2012.10

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  • C-13-2 Fabrication of Water-stable Electrospun Poly(acrylic acid) Fibers for Long-Range Surface Plasmon Resonance Biosensor

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

    Proceedings of the Society Conference of IEICE   2012 ( 2 )   121 - 121   2012.8

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  • C-13-4 Fabrication and evaluation of pentacene field-effect transistor with HAT-CN carrier generation layer

    Goto Takatoshi, Minagawa Masahiro, Baba Akira, Shinbo Kazunari, Kato Keizo, Kaneko Futao

    Proceedings of the Society Conference of IEICE   2012 ( 2 )   123 - 123   2012.8

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  • Fabrication of Electrospun Nano-Fibers and Applications to Electronic Devices

    KANEKO Futao, BABA Akira, SHINBO Kazunari, KATO Keizo

    2012 ( 74 )   33 - 36   2012.7

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  • In-situ Evaluation of Lead Phthalocyanine Thin Film Deposition Using a Hybrid Sensor of Quartz Crystal Microbalance and Optical Waveguide Spectroscopy

    HIRAKAWA Ryo, UNO Akihiro, SHINBO Kazunari, BABA Akira, KATO Keizo, KANEKO Futao

    2012 ( 74 )   43 - 46   2012.7

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  • Fabrication of Electrospun Nano-Fibers and Applications to Electronic Devices

    KANEKO Futao, BABA Akira, SHINBO Kazunari, KATO Keizo

    Technical report of IEICE. OME   112 ( 139 )   33 - 36   2012.7

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    Various polymer nanofibers were fabricated using electrospinning method with a copper wire in the capillary tube as an electrode. Fine fibers were obtained without any additional pressure to polymer solution in the capillary and the solution volume could be reduced compared to the conventional method since electric fields are applied directly to the solution surface by the copper wire electrode. A soluble carbazole precursor polymer with gold nanoparticles were fabricated using this method and then were cross-linked by applying potential cycles in an electrochemical cell to be converted to conjugated polymer fibers. It has been investigated that the fluorescence from the conjugated fibers was dependent on the rate of the conversion, doping and the amount of gold nanoparticles. Electrospun fibers have been used to sensor applications because of their large surface area. A biosensor using electrospun fibers detecting human immunoglobulin G was fabricated utilizing long-range surface plasmon resonance with stronger evanescent waves than that of conventional surface plasmon, and the sensing property was shown for the biosensor.

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  • 表面プラズモン励起を利用した有機太陽電池 Invited

    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   2012.7

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  • Distance-Dependent Surface Plasmon Resonance Coupling between Silver Nanoparticles and Gold Grating Surface

    LERTVACHIRAPAIBOON Chutiparn, BABA Akira, EKGASIT Sanong, THAMMACHAROEN Chuchaat, SHINBO Kazunari, KATO Keizo, KANEKO Futao

    Technical report of IEICE. OME   112 ( 57 )   59 - 62   2012.5

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    In this work, we developed our technique to increase the surface plasmon excitation intensity and facilitate decoupling of SPR by the deposition of silver nanoparticles (AgNPs) on gold grating surface as a transmission surface plasmon resonance (T-SPR) substrate. The T-SPR spectrum of gold grating substrate with silver nanoparticles showed the strong and narrow SPR peak which located between 650-800 nm and the maximum SPR excitation was observed at 35° angle of incidence. Furthermore, the distance between AgNPs and gold grating surface was controlled by using layer-by-layer (LBL) of poly(diallydimethyl ammonium) (PDADMAC) and poly(styrene sulfonate) (PSS) to study the distance-dependent of coupling between AgNPs and gold grating substrate. The distance-dependent T-SPR response, both peak position and T-SPR intensity, showed distinctive shift at 5-10 bilayers spacer. At this region, the strongest coupling effect of localized and propagating surface plasmon excitation should be obtained. The present study should be useful for the characterization of nanomaterial and for sensor application.

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  • CS-5-4 Controlling Surface Plasmon Optical Transmission with Electrochemical Switch Using Conducting Polymer Thin Films and Sensor Applications

    Baba Akira, Tada Kohji, Shinbo Kazunari, Kato Keizo, Kaneko Futao

    Proceedings of the IEICE General Conference   2012 ( 2 )   "S - 19"-"S-20"   2012.3

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  • Fabrication and Gas Sensings of Multiple Surface Plasmon Resonance Waveguide Sensor

    TAKAHASHI Hayato, MIZUSAWA Kenta, SHINBO Kazunari, BABA Akira, KATO Keizo, KANEKO Futao

    2012 ( 1 )   29 - 33   2012.1

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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

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    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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  • 表面プラズモン共鳴・光導波路分光複合センサによるフタロシアニン交互吸着薄膜の堆積評価

    押鐘太希, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   73rd   2012

  • エレクトロスプレー法による液晶ナノ粒子生成と配列制御法の検討

    沓澤崇之, 大平泰生, 新保一成, 馬場暁, 加藤景三, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   73rd   2012

  • エバネッセント波干渉計を用いた金属短針近傍の液晶配向変化の評価

    高木興二郎, 大平泰生, 大平泰生, 佐々木修己, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学関係連合講演会講演予稿集(CD-ROM)   59th   2012

  • 水晶振動子・光導波路分光複合センサによる鉛フタロシアニン薄膜推積のその場評価

    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

    応用物理学関係連合講演会講演予稿集(CD-ROM)   59th   2012

  • 金属ナノワイヤ近傍の偏極近接場光によるアゾ薄膜のナノ構造形成

    村山範芳, 大平泰生, 新保一成, 馬場暁, 加藤景三, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   73rd   2012

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

    KATO Ryuta, OSEKI Takao, BABA Akira, SHINBO Kazunari, KATO Keizo, KANEKO Futao, SHEPPARD Gareth, LOCKLIN Jason

    Technical report of IEICE. OME   111 ( 236 )   9 - 13   2011.10

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    We demonstrate a fabrication of combined technique of transmission surface plasmon resonance (T-SPR) spectroscopy and microfluidic device in view of their potential applications of compact biosensors. Surface plasmon resonance (SPR) spectroscopy has become a widely accepted method for the characterization and study of ultrathin films, interfaces and kinetic processes at surfaces, and been investigated in the applications of SPR sensors and plasmonic devices. Many of them involved the enhancement of optical field due to the surface plasmon excitation at metal/dielectric interfaces. Recently extraordinary transmission surface plasmon resonance property has been reported with nanohole arrays and grating substrates. Obvious shifts of T-SPR peaks were observed when a human IgG were injected into Teflon cell and microfluidic devices.

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  • Organic Devices and Sensors Utilizing Evanescent Waves and Surface Plasmon Resonance

    KATO Keizo, BABA Akira, SHINBO Kazunari, KANEKO Futao

    Technical report of IEICE. OME   111 ( 236 )   1 - 6   2011.10

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    Recently, many researches on the organic electronics and photonics are carried out for the development of organic devices and sensors, which are flexible, cost-effective, and ease in mass production. Particularly, organic field effect transistors, organic light-emitting diodes and organic solar cells, biosensors have been very actively studied. The optical techniques utilizing evanescent waves and surface plasmon resonance (SPR) due to surface plasmon (SP) excitation at the interface between metal and dielectric materials are quite useful for evaluation of organic ultrathin films and applications to organic devices and sensors. In this paper, our recent developments of organic devices and sensors utilizing evanescent waves and SPR are overviewed.

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  • CS-4-3 Evaluation of Organic Film Deposition Using Hybrid Sensor of Optical Waveguide Spectroscopy and Quartz Crystal Microbalance

    Shinbo Kazunari, Uno Akihiro, Ishikawa Hiroshi, Kurosawa Eiji, Yokoyama Shinji, Ohdaira Yasuo, Baba Akira, Kato Keizo, Kaneko Futao

    Proceedings of the Society Conference of IEICE   2011 ( 2 )   "S - 10"-"S-11"   2011.8

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  • Evaluation of Thin Film Deposition and Vapor Detection Utilizing a Hybrid Sensor of Quartz Crystal Microbalance and Waveguide-Based Surface Plasmon Resonance Spectroscopy

    ISHIKAWA H., OHDAIRA Y., BABA A., SHINBO K., KATO K., KANEKO F.

    2011 ( 54 )   45 - 48   2011.7

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  • Enhancement of Photoelectric Conversion Properties in Grating-Coupling Surface Plasmon Resonance Field-Enhanced Dye-Sensitized Solar Cell

    BABA Akira, WAKATSUKI Keisuke, SHINBO Kazunari, KATO Keizo, KANEKO Futao

    IEICE technical report   111 ( 73 )   35 - 38   2011.5

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    In this paper, we demonstrate the fabrication of grating-coupling surface plasmon resonance (SPR)-enhanced dye-sensitized solar cells (DSSCs) and their increased short-circuit current properties. DSSCs consisted of a grating substrate/gold/TiO_2/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. TiO_2 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 TiO_2 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 to that without SP excitation. Finite-difference time-domain simulation indicated that the electrical field in the dye layer could be increased using the grating-coupling SP technique.

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  • Humidity Detection Using Hybrid Sensor of Ridge-type Optical Waveguides on Quartz Crystal Microbalance

    IWASAKI Makoto, OHDAIRA Yasuo, BABA Akira, SHINBO Kazunari, KATO Keizo, KANEKO Futao, MIYADERA Nobuo

    2011 ( 1 )   13 - 16   2011.1

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  • 表面プラズモン共鳴及び水晶振動子複合センサによる有機薄膜堆積及び蒸気検出

    石川寛, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男

    応用物理学関係連合講演会講演予稿集(CD-ROM)   58th   2011

  • 液晶媒質中のアゾ膜上の金ナノ構造における局在プラズモン励起と薄膜変形効果

    福井昭洋, 大平泰生, 新保一成, 馬場暁, 加藤景三, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   72nd   2011

  • アゾベンゼン分子を用いた液晶薄膜の光変形とその光学特性

    山田一也, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学関係連合講演会講演予稿集(CD-ROM)   58th   2011

  • 水晶振動子・光導波路分光複合センサによる鉛フタロシアニン真空蒸着薄膜のその場推積評価

    鵜野成博, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   72nd   2011

  • 液晶/アゾ薄膜界面に形成した金ナノ構造における局在プラズモン励起

    福井昭洋, 大平泰生, 大平泰生, 新保一成, 新保一成, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学関係連合講演会講演予稿集(CD-ROM)   58th   2011

  • 光導波路型多重表面プラズモン共鳴センサによる蒸気検出

    高橋勇人, 水澤謙太, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 馬場暁, 加藤晃三, 加藤晃三, 金子双男, 金子双男, 川上貴浩

    電気学会全国大会講演論文集   2011 ( 2 )   2011

  • 金ナノ粒子によるグレーティングフィルムの作製と伝搬型表面プラズモン共鳴センサへの応用

    山崎亮輔, 馬場暁, 大平泰生, 新保一成, 加藤景三, 金子双男, EKGASIT Sanong, THAMMACHAROEN Chuchaat, SAMANTA Satya, LOCKLIN Jason

    応用物理学関係連合講演会講演予稿集(CD-ROM)   58th   2011

  • Properties of Transmission Surface Plasmon Resonance Using Grating Coupling

    TADA Koji, BABA Akira, SHINBO Kazunari, KATO Keizo, KANEKO Futao

    2010 ( 1 )   27 - 32   2010.5

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  • Properties of Grating-Coupling Surface Plasmon Resonance by Irradiation of White Light and It's Applications to Novel Sensor

    YAMAZAKI Ryosuke, ASAKI Shingo, BABA Akira, OHDAIRA Yasuo, KATO Keizo, KANEKO Futao, SAMANTA Satya, LOCKLIN Jason

    IEICE technical report   110 ( 59 )   21 - 25   2010.5

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    In this work, we demonstrate a novel dopamine sensor using multimode surface plasmon excitations by irradiating white light source on metallic diffraction gratings /plastic substrates. A recordable blue-ray disc (BD-R:Λ=320 nm) and a compact disc (CD-R:Λ=l.6μm) were used as diffraction grating substrates. In the case of CD-R disc, multiple surface plasmon resonance excitations due to several diffraction orders were observed at same time as the grating pitch is larger than commonly used diffraction gratings. Layer-by-layer ultrathin films prepared from iron containing bis(terpyridine) polymer (Fe(II)-BTP) and poly(ethylene dioxythiophene) : poly(styrene sulfonate) (PEDOT:PSS) were used as an electrochemical mediator for sensing the dopamine. Large changes in grating coupling surface plasmon dips were obtained upon an injection of the dopamine on the LbL/metallic grating surface.

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  • アゾ分子薄膜上に形成した金属ナノ構造体における近接場光励起の観測

    石田哲敏, 大平泰生, 大平泰生, 新保一成, 新保一成, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集(CD-ROM)   71st   2010

  • 光導波路型表面プラズモンセンサによる多チャンネルガスセンシング

    水澤謙太, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩, 宮寺信生

    応用物理学関係連合講演会講演予稿集(CD-ROM)   57th   2010

  • 金属格子上多重励起型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, SAMANTA Satya, LOCKLIN Jason

    応用物理学関係連合講演会講演予稿集(CD-ROM)   57th   2010

  • CS-6-3 Surface Plasmon Resonance Sensor Using White Light Irradiation on Mettalic Grating

    Baba Akira, Yamazaki Ryousuke, Ohdaira Yasuo, Shinbo Kazunari, Kato Keizo, Kaneko Futao, Samanta Satya, Locklin Jason

    Proceedings of the Society Conference of IEICE   2009 ( 2 )   "S - 22"-"S-23"   2009.9

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  • Report on the 2008 "Workshop for Refreshing Science" in Niigata

    OHKAWA Masashi, SUZUKI Takamasa, TSUBOI Nozomu, SHINBO Kazunari, OHDAIRA Yasuo, BABA Atsushi, IWANO Haruo, MARUYAMA Takeo

    33 ( 1 )   35 - 38   2009.7

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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

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  • 応用物理学会の教育・公益事業の取組みとして~北陸・信越支部による「リフレッシュ理科教室」~

    坪井望, 鈴木孝昌, 大河正志, 新保一成, 大平泰生, 馬場暁, 岩野春男, 丸山武男

    応用物理学会学術講演会講演予稿集   70th   2009

  • 金属ワイヤ電極を用いた電界紡糸法による高分子ファイバの作製および構造観察

    小野塚信太郎, 新保一成, 金子双男, 加藤景三, 馬場暁, 大平泰生

    電気学会基礎・材料・共通部門大会講演論文集(CD-ROM)   2009   2009

  • 交互吸着法による有機色素-カーボンナノチューブ複合超薄膜の作製と評価

    松沢泰平, 馬場暁, 馬場暁, 大平泰生, 大平泰生, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   70th ( 3 )   2009

  • 光近接場におけるアゾベンゼン分子の偏光選択的な自己ナノ構造形成

    横川泰人, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   70th ( 3 )   2009

  • 水晶振動子基板上へのインプリントグレーティング構造の作製と表面プラズモン励起

    黒木一孝, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 宮寺信生

    応用物理学会学術講演会講演予稿集   70th ( 3 )   2009

  • 近接場光加工したアゾベンゼン薄膜上における液晶分子の配向変化の観測

    山田一也, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   70th ( 3 )   2009

  • 多チャンネル光導波路型表面プラズモンセンサにおけるガス検出

    水澤謙太, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩, 宮寺信生

    応用物理学会学術講演会講演予稿集   70th ( 3 )   2009

  • V<sub>2</sub>O<sub>5</sub>/CuPc積層電界効果トランジスタにおける混合層の挿入効果

    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

    電気学会全国大会講演論文集   2009 ( 2 )   2009

  • 水晶振動子微量天秤上リッジ光導波路による吸着センサ

    大朏俊弥, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男, 宮寺信生

    応用物理学関係連合講演会講演予稿集   56th ( 3 )   2009

  • グレーティングカップリング多重励起表面プラズモン共鳴を用いたセンサー応用

    山崎亮輔, 馬場暁, 大平泰生, 新保一成, 加藤景三, 金子双男, SAMANTA Satya, LOCKLIN Jason

    応用物理学関係連合講演会講演予稿集   56th ( 3 )   2009

  • Surface Manipulation of Carbazole Precursor Polymer Thin Film by AFM Nanolithography

    OYANAGI Ryohei, BABA Akira, OHDAIRA Yasuo, SHINBO Kazunari, KATO Keizo, KANEKO Futao, JIANG Guoqian, ADVINCULA Rigoberto

    IEICE technical report   108 ( 348 )   29 - 32   2008.12

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    In this study, atomic force microscope (AFM) nanolithography was used in order to manipulate the surface morphology of carbazole precursor dendron polymer thin films. The precursor films were prepared by spin-coating method on evaporated gold thin films. The bias voltages were applied between the conducting AFM cantilever and gold thin films, generating the cross-linking of electroactive pendant carbazole monomers present in the films. This was attributed the electrochemical ion transport, which was assisted by water meniscus and residual mobile ions in the film. The raised morphology was observed after the application of bias voltages. An increase in height change was observed as applied voltages increased, while it was decreased as the scanning speed was increased.

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  • A Hybrid Vapor Sensor Using Waveguide Surface Plasmon Resonance and Quartz Crystal Microbalance

    SHINBO K., TSURUGAI Y., AIDA K., OHDAIRA Y., BABA A., KATO K., KANEKO F., MIYADERA N.

    2008 ( 73 )   39 - 43   2008.11

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  • A Hybrid Vapor Sensor Using Waveguide Surface Plasmon Resonance and Quartz Crystal Microbalance

    SHINBO K., TSURUGAI Y., AIDA K., OHDAIRA Y., BABA A., KATO K., KANEKO F., MIYADERA N.

    IEICE technical report   108 ( 280 )   39 - 43   2008.10

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    A Hybrid sensor utilizing SPR and QCM methods was prepared, and PVA film deposition and gas adsorption to the PVA films were investigated. The optical absorption properties due to SP excitation depended on the PVA film thickness. The adsorptions of humidity, ethanol and acetone gases were investigated by SPR and QCM methods and responses were repeatedly observed. The humidity response depended on the PVA thickness and it was considered to be due to the small penetration depth of electric field. The hybrid sensor in this study is easy to fabricate and useful for various film evaluation and sensors.

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  • Alignment control of submicron materials using azobenzene molecular film fabricated by optical near-field

    KIMURA H., YAMAZAKI H., OHDAIRA Y., SHINBO K., BABA A., KATO K., KANEKO F.

    IEICE technical report   108 ( 269 )   29 - 33   2008.10

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    Optical near-fields localizing near a material surface provide us the novel technologies of material fabrication in nano meter regions. This is applicable to the excitation- and transportation-control of optical near field signals, and expected to develop a high-speed and highly-functional device which is never achievable by the conventional optical technology. For a practical optical-device operation, it is very important to develop the modification method of nano material alignment controlled by the external optical-signals. In this study, we demonstrate an alignment control of sub-micron materials using the optically controllable photo-alignment layers fabricated simply by the standing evanescent waves. Dielectric small spheres were periodically aligned on the grating structures of azobenzene molecular films. The vertical positions were controlled by the rewriting processes using the optical near-fields around the small spheres. Furthermore, we investigated the local plasmon excitations on the metallic nano-wires fabricated by an oblique evaporation on the azobenzene gratings.

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  • Preparation of Polymer Fine Fiber Using Electrospinning Method with a Metal Wire Electrode in a Capillary Tube

    HOSHINO R., ONODUKA S., OHDAIRA Y., BABA A., SHINBO K., KATO K., KANEKO F.

    IEICE technical report   108 ( 269 )   35 - 39   2008.10

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    We prepared electrospun polymer fibers using a copper wire electrode in Teflon capillary tube. Compared to conventional method, fiber diameter, needed volume of polymer solution, applied voltage for fiber preparation, distance between the electrodes can be largely reduced in this method. The shapes were investigated for electrospun poly (vinylalcohol) fiber prepared with various conditions. Furthermore, orientation control of PS fibers and preparation of P3HT fiber field-effect transistor were carried out. This method should be useful for study of electrospinning method and developing electronic devices using electrospun fibers.

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  • CS-4-7 Detection of Catecholamines with Poly (3-aminobenzylamine) Thin Films Using Electrochemical-SPR Spectroscopy

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

    Proceedings of the Society Conference of IEICE   2008 ( 2 )   "S - 20"-"S-21"   2008.9

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  • Surface Plasmon Excitations and Emission Lights in Nanostructured Organic Thin Films

    KATO Keizo, HAFUKA Megumi, OHDAIRA Yasuo, BABA Akira, SHINBO Kazunari, KANEKO Futao

    2008 ( 6 )   35 - 40   2008.5

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  • エレクトロスピニング法における有機高分子ファイバの作製と配向制御

    星野力哉, 水野佳紀, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    電気学会全国大会講演論文集   2008 ( 2 )   2008

  • エバネッセント波干渉法によるアゾベンゼン分子薄膜の偏光励起特性の観測

    室谷謙吾, 大平泰生, 大平泰生, 佐々木修己, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   69th ( 3 )   2008

  • 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, JIANG Guoqian, ADVINCULA Rigoberto

    応用物理学会学術講演会講演予稿集   69th ( 3 )   2008

  • CuPcおよびV<sub>2</sub>O<sub>5</sub>積層構造を用いたOFETの作製と評価

    北村翔平, 皆川正寛, 大平泰生, 大平泰生, 馬場暁, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   69th ( 3 )   2008

  • アゾベンゼン分子薄膜上へのナノ格子構造の作製とサブミクロン微小球の配列制御

    木村浩章, 山崎初, 大平泰生, 大平泰生, 新保一成, 新保一成, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学関係連合講演会講演予稿集   55th ( 3 )   2008

  • 有機溶媒蒸気処理とV<sub>2</sub>O<sub>5</sub>挿入によるマグネシウムフタロシアニンFETの特性変化

    高塚泰人, 赤澤敏幸, 東川哲之, 皆川正寛, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男, 馬場暁, 大平泰生, 大平泰生

    電気学会全国大会講演論文集   2008 ( 2 )   2008

  • 金属探針に発生する近接場光によるアゾベンゼン分子薄膜の光加工過程の局所観測

    今井祐輔, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学会学術講演会講演予稿集   69th ( 3 )   2008

  • 光導波路型SPRセンサにおける多チャンネルガス検出

    水澤謙太, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩, 宮寺信生

    応用物理学会学術講演会講演予稿集   69th ( 3 )   2008

  • 表面プラズモン共鳴および水晶振動子微量天秤法による同時蒸気センシング

    鶴貝嘉則, 相田和也, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩, 宮寺信生

    応用物理学関係連合講演会講演予稿集   55th ( 3 )   2008

  • 平坦誘電体・金属界面における分子系の光近接場励起とその観測

    大平泰生, 大平泰生, 阿部淳, 阿部淳, 石神慎哉, 石神慎哉, 新保一成, 新保一成, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男

    応用物理学関係連合講演会講演予稿集   55th ( 3 )   2008

  • Otto配置における表面プラズモン放射光特性の金属膜厚依存性

    羽深恵, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩

    応用物理学関係連合講演会講演予稿集   55th ( 3 )   2008

  • 水晶振動子微量天秤上ポリマー光導波路を用いた湿度センシング

    神林裕一, 大朏俊也, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男, 宮寺信生

    応用物理学関係連合講演会講演予稿集   55th ( 3 )   2008

  • 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

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  • 電気化学的ドーピング制御によるポリチオフェン薄膜の表面プラズモン放射光特性

    山下一希, 新保一成, 新保一成, 馬場暁, 大平泰生, 大平泰生, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩

    応用物理学会学術講演会講演予稿集   68th ( 3 )   2007

  • 水晶振動子微量天秤上光導波路による湿度センサ

    神林裕一, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男, 宮寺信生

    応用物理学会学術講演会講演予稿集   68th ( 3 )   2007

  • エレクトロスピニング法による有機高分子ファイバの作製

    星野力哉, 水野佳紀, 新保一成, 大平泰生, 馬場暁, 加藤景三, 金子双男

    電気電子絶縁材料システムシンポジウム予稿集   38th   2007

  • 光導波路型表面プラズモン共鳴と水晶振動子微量天秤法を用いた蒸気センシング

    相田和也, 鶴貝嘉則, 新保一成, 新保一成, 大平泰生, 大平泰生, 馬場暁, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩, 宮寺信生

    応用物理学会学術講演会講演予稿集   68th ( 3 )   2007

  • Fabrication and Evaluation of copper phthalocyanine Field-effect Transistors with Vanadium oxide layers

    北村翔平, 高橋俊明, 皆川正寛, 大平泰生, 馬場暁, 新保一成, 加藤景三, 金子双男

    電気電子絶縁材料システムシンポジウム予稿集   38th   2007

  • Kretschmann/Otto配置における表面プラズモン放射光特性

    羽深恵, 大平泰生, 大平泰生, 馬場暁, 新保一成, 新保一成, 加藤景三, 加藤景三, 金子双男, 金子双男, 川上貴浩

    応用物理学会学術講演会講演予稿集   68th ( 3 )   2007

  • 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

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    We have developed a new methodology to fabricate high resolution DNA microarray (2,500-10<Sup>4</Sup> dots/cm<Sup>2</Sup>) in combination with micro contact printing (μ-CP) and SPR imaging. Novel COOH-terminated PEG-disulfides with <I>p</I>-carborane were synthesized to fabricate the first layer on gold substrates to achieve surface coupling reaction with amino-terminated DNA in high yield. The hybridization of the target-DNA modified gold nanoparticles on probe-DNA patterned surfaces was successfully demonstrated by the SPR imaging, where nonspecific adsorption was not observed to the array background. The gold nanoparticle arrays provide quite high contrast even at low surface coverage (∼10%) by the enhancement effect of optical signals based on nano-scale phenomena in the near field. This enhancement effect can be well demonstrated by the simulation based on Maxwell-Garnett (MG) theory and Fresnel's equation.

    DOI: 10.1380/jsssj.27.21

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  • NANOCOMPOSITE MULTILAYERS OF REGIOREGULAR POLY (3-PROPANOIC ACID THIOPHENE)/GOLD NANOPARTICLE USING THE LAYER-BY-LAYER SELF-ASSEMBLY TECHNIQUE

    Ikarashi Hiroshi, Shinbo Kazunari, Kaneko Futao, Kato Keizo, Locklin Jason, Baba Akira, Advincula Rigoberto

    Technical report of IEICE. OME   105 ( 103 )   29 - 33   2005.5

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    Nanocomposite multilayer ultrathin films of regioregular poly (3-propanoic acid thiophene) (P3PT)/Au nanoparticles (NPs) were prepared using the Layer-by-Layer deposition technique as it is expected that P3PT/Au NPs LbL films show high conductivity. The deposition of P3PT/PAH (Poly (allylamine hydrochloride)) and Au NPs/PAH was accomplished based on aqueous solution on different uniformly charged substrates on purpose to obtain high conduction or new function. The layer thicknesses were increased stepwise and regularly with layer number, and were estimated with UV-vis and in-situ surface plasmon resonance (SPR) spectroscopy. AFM images were measured to investigate the functionality and surface morphology of Au NPs LbL films.

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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   2005.3

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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   2005.3

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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   2004.3

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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   2004.3

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  • Photo-Induced In-Plane Alignments of Nematic Liquid Crystal Molecules on Azo-Dye Containing Alternate Self-Assembled Films Investigated Using Attenuated Total Reflection Method

    SHINBO Kazunari, ISHIKAWA Jun, BABA Akira, KANEKO Futao, KATO Keizo, C. ADVINCULA Rigoberto

    2001   646 - 647   2001.9

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  • Evaluations of Photo-Induced Alignments of LC Molecules on Alternate Self-Assembled Films of Azo-Dye and Polyelectrolyte using The Attenuated Total Reflection Measurement

    SHINBO Kazunari, ISHIKAWA Jun, BABA Akira, KATO Keizo, KANEKO Futao, ADVINCULA R. C.

    Technical report of IEICE. OME   100 ( 425 )   37 - 42   2000.11

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Photo-induced in-plane alignments of nematic liquid crystal(LC)molecules, 5CB, have been investigated using the attenuated total reflection(ATR)measurement method. The alternate self-assembled films of polyelectrolyte and low-molecular weight azobenzene dye on gold electrodes were used as aligning layers of the cell. The ATR properties of the LC cell were sensitively changed by photo-isomerization of azobenzen dye due to irradiation of linearly polarized visible light to the LC cell. From the calculated ATR curves, in-plane alignments of the LC molecules within the penetration length of the SPP were aligned to be perpendicular to the polarized direction of the irradiation light.

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  • Evaluation of Liquid Crystal Molecules on Poly(vinyl-cinnamate) Aligning Layers using the Attenuated Total Reflection Measurement.

    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   1998.11

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    Tilt angles of nematic liquid crystal molecules, 5CB, have been evaluated in liquid crystal cells with photopolymerized poly (vinyl-cinnamate) (PVCi) alignment layers on aluminum films using the attenuated total reflection (ATR) measurement. Guided wave excitation modes were excited in the ATR measurement and the tilt angles were obtained from the ATR measurement. Photo-alignment of the liquid crystal molecules on the PVCi films has been also investigated as a function of irradiation time of linearly polarized UV light.

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  • Evaluation of Adsorption Processes of Self-assembled Films for Liquid Crystal Aligning Layers Using the Attenuated Total Reflection Method.

    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   1998.6

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    Adsorption processes of self-assembled films on Al evaporated films have evaluated using the Attenuated Total Reflection (ATR) method. Two kinds of non-conjugated polyelectrolytes, i. e. PSS and PAH were used for the film deposition. The ATR measurement showed that adsorption of these monolayers were changing with time. The thickness of the PSS monolayers on the Al films in the cell gradually increased with repetition of the deposition. On the contrary, thickness of the PAH monolayers decreased with the deposition cycles. Furthermore, the film thickness of each monolayers depended on the number of the layers.

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  • Evaluation of Tilt Angles of Liquid Crystal Molecules on Polyimide LB Films Using the Attenuated Total Reflection Measurement

    BABA Akira, KANEKO Futao, SHINBO Kazunari, KATO Keizo, KOBAYASHI Satoshi, WAKAMATSU Takashi

    Technical report of IEICE. OME   97 ( 394 )   1 - 6   1997.11

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    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 and the guided wave excitation modes 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 some kinds of models. Furthermore, the electric field intensities in the cell were calculated at several incident angles of the laser beam in the ATR curves. The ATR measurement is very useful to evaluate aligning properties of liquid crystal molecules in liquid crystal cells.

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  • Evaluation of Orientation of Liquid Crystal Molecules on LB films using the Attenuated Total Reflection Measurement

    BABA Akira, KANEKO Futao, SHINBO Kazunari, KATO Keizo, KOBAYASHI Satoshi, WAKAMATSU Takashi

    Preprints of Symposium on Liquid Crystals   23   422 - 423   1997.9

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    Language:Japanese   Publisher:Japanese Liquid Crystal Society  

    Attenuated total reflection (ATR) properties have been investigated to evaluate tilt angles of liquid crystal molecules, 5CB, in the liquid crystal cells with the polyimide (PI) LB alignment films on the aluminum electrodes. The ATR properties were explained by the surface plasmon polariton and the guided wave excitation modes when various DC voltages were applied to the cells. The tilt angles of the liquid crystal molecules were calculated near the LB films and in the middle layer region of the cells by fitting the theoretical ATR curves to the experimental ones. It is thought that the ATR measurement is very useful for evaluating the aligning properties of liquid crystal molecules in the liquid crystal cell.

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  • Evaluation of Liquid Crystal Molecules on Aligning Layers of Self-Assembled Monolayers Using the Attenuated Total Reflection Method

    Yamagata S., Baba A., Sinbo K., Kato K., Kaneko F.

    Proceedings of the Society Conference of IEICE   1997 ( 2 )   147 - 147   1997.8

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Presentations

  • [Invited Talk] Investigation of Surface Plasmon Enhanced Photo-electric Conversion Systems Invited International conference

    Akira Baba

    2019 International Conference on Flexible and Printed Electronics (ICFPE)  2019.10 

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    Venue:Taipei, Taiwan  

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

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

    American Chemical Society (ACS) 2019 Fall meeting, Biosensing Symposium  2019.8 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:San Diego, USA  

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  • [Invited Talk] Surface Plasmon Enhanced Organic Devices and Biosensor Applications Invited International conference

    Akira Baba

    The 12th Asia-Pacific Conference on Near-Field Optics (APNFO12)  2019.7 

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    Venue:Xiamen, China  

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  • [Keynote] Development of Surface Plasmon Enhanced Photo-electric Conversion Systems Invited International conference

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

    NanoThailand 2018  2018.12 

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  • Investigation of Plasmonic Systems for Improvement of Organic Solar Cells and Biosensors [Invited Talk] Invited International conference

    Akira Baba, Chutiparn Lertvachirapaiboon, Kazunari Shinbo, Keizo Kato

    PERCH-CIC Congress X: 2018 International Congress for Innovation in Chemistry  2018.7 

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    Venue:Pattaya, Chonburi, Thailand  

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  • Development of Surface Plasmon Enhanced Photo-electric Conversion Systems [Invited Talk] Invited International conference

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

    The 29th International Conference on Molecular Electronics and Devices (IC ME&D 2018)  2018.5 

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    Venue:Daegu, Korea  

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  • Surface Plasmon Resonance Excitation Based Organic Device Applications [Invited Talk] Invited International conference

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

    The 4th International Conference on Advanced Electromaterials (ICAE 2017)  2017.11 

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    Venue:Jeju, Korea  

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  • Surface Plasmon Resonance Enhanced Organic Devices and Biosensor Applications [Invited Talk] Invited International conference

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

    Materia Manila 2017  2017.10 

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    Venue:Manila, Philippine  

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  • Plasmonic-Gold Quantum Dots Hybrid Nanostructures for Improvement of Organic Solar Cells [Invited Talk] Invited International conference

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

    IUMRS-ICAM 2017 The 15th International Conference on Advanced Materials  2017.8 

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    Venue:Kyoto, Japan  

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  • Investigation of Plasmonic Systems for Improvement of Organic Solar Cells [Invited Talk] Invited International conference

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

    Ewha Chemistry and Nanoscience International Symposium (ECNIS) 2017  2017.5 

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    Venue:Seoul, Korea  

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  • Investigation of Gold Quantum Dots/Plasmonic Systems for Improvement of Organic Solar Cells [Invited Talk] Invited International conference

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

    NANOTEK 2017  2017.3 

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    Venue:Hamburg, Germany  

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  • Organic Solar Cells Enhanced by Gold Quantum Dots/Plasmonic System [Invited Talk] Invited International conference

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

    EMN Meeting on Energy and Sustainability 2016  2016.11 

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    Venue:Osaka, Japan  

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  • Gold Quantum Dots Enhanced Organic Thin Film Solar Cells [Invited Talk] Invited International conference

    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  2016.10 

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    Venue: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 Invited

    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  2016.3 

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    Venue:東工大  

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  • Detection of Multiple Analytes by Electrochemical-Surface Plasmon Resonance Biosensor [Invited Talk] Invited International conference

    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)  2015.11 

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    Venue:Chiang Mai, Thailand  

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Awards

  • Hot Article Award, Analytical Sciences

    2019.3  

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  • / Award for Encouragement of Research in Thin Films

    2011.11   The 15th International Conference on Thin Films (ICTF-15)  

    BABA Akira

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  • / Nanobiology Fellowship

    2006.10   Keck Center (USA)  

    BABA Akira

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  • / Research Fellowship

    1999.11   Alexander von Humboldt Foundation (Germany)  

    BABA Akira

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  • / 4th JSAP presentation award

    1998.3   JSAP  

    BABA Akira

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Research Projects

  • Fabrication of Flexible Plasmonic Photothermal Films

    Grant number:20K21140

    2020.7 - 2023.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Research category:Grant-in-Aid for Challenging Research (Exploratory)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\6500000 ( Direct Cost: \5000000 、 Indirect Cost:\1500000 )

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  • Fabrication of Cooperative Multiple Plasmonic Structures Using Metal Nanoparticle-Grating and Their Organic Photo-electronic device Applications

    Grant number:20H02601

    2020.4 - 2024.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

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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

    2018.9 - 2019.8

    System name:A-STEP機能検証フェーズ 試験研究タイプ

    Awarding organization:科学技術振興機構

    馬場 暁

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  • NIR-activate Organic Solar Cells Induced by Hybrid Plasmonic System

    Grant number:17F17361

    2017.11 - 2019.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

    Research category:Grant-in-Aid for JSPS Fellows

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\1100000 ( Direct Cost: \1100000 )

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  • Surface Plasmon Transmission Light in Nanostructured Organic Films on Metal Grating and Application to High-Sensitivity Sensors

    Grant number:17H03231

    2017.4 - 2020.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Kato Keizo

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    Grant amount:\18200000 ( Direct Cost: \14000000 、 Indirect Cost:\4200000 )

    Surface plasmon (SP) transmission light in nanostructured organic thin film on metal grating was investigated. Sensors using organic thin films containing metal nanoparticles fabricated on metal grating showed higher sensitivity due to both the propagation SP at the interface between metal and organic thin films and the localized SP at the metal particle interface. Furthermore, it was shown that the sensitivity of the sensor can be further improved by using long-range SP excitation. In addition, it has been shown that biosensors using microfluidic devices, their imaging, and flexible sensor applications are also possible.

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  • Development of Flexible Plasmonic Sensor Sheet

    Grant number:16K13662

    2016.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for the Promotion of Science

    Baba Akira

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    In this study, we tried to construct transmission-type surface plasmon resonance sensing system using flexible grating substrate upon irradiation of white light. The results obtained are as followed.
    1)The transmission-type surface plasmon resonance imaging sensor system with c-MOS camera was constructed. 2) The surface plasmon resonance properties at flexible/stretched state were studied using flexible plasmonic sheets. 3) The detection of refractive index change was obtained from the transmission-type surface plasmon resonance imaging measurements using the combination of flexible plasmonic sheet and microfluidic devices.

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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

    2015.6 - 2018.5

    System name:二国間交流事業(JSPS-NRCT(タイ))

    Awarding organization:日本学術振興会

    馬場 暁

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  • Development of High Performance Organic Phototransistor Utilizing Long-range Surface Plasmon Resonance

    Grant number:26420301

    2014.4 - 2017.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Shinbo Kazunari

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    Grant type:Competitive

    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    In this study, development of high performance organic phototransistor (OPT) utilizing surface plasmon resonance (SPR) was attempted. The intense electric field of SPR would enhance optical absorption of organic semiconductor film and sensitivity of OPT. Use of Long-range surface plasmon resonance (LRSPR) accompanying more intense electric field compared to normal SPR was mainly investigated. The LRSPR excitation in the device was confirmed through reflection property, and the prepared OPT exhibited large sensitivity for p-polarized light irradiation inducing LRSPR.

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  • Light Trapping via Multiple Plasmonic Structures and Their Applications to Organic Solar Cells

    Grant number:25390051

    2013.4 - 2016.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    BABA Akira, SHINBO KAZUNARI

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    In this work, we studied the enhancement of organic thin film solar cells by surface plasmon resonance (SPR) phenomena originated from grating-coupled technique and further improved their performance by metal nanoparticles (NPs). The devices of Al/P3HT: PCBM/Metal NPs:PEDOT:PSS/ITO were fabricated. The results from J-V curves indicated that the power conversion efficiency (PCE) of Al-coated grating substrate was 3.10 % which was better than that of flat substrate for 1.55 times. We further developed the Al-coated grating substrate by incorporated gold and silver NPs in to PEDOT:PSS layer. The PCE of Al-coated grating substrate with gold NPs and silver NPs were 3.25% and 3.17%, respectively. This indicated that the light absorption enhancement at the active layer is attributed to SPR excitation with strong near-field distributions penetrated into absorption polymer, which could lead to higher efficiencies due to the increased absorption, thus resulting in higher current generation.

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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

    2012.7 - 2013.3

    System name:知財活用促進ハイウェイ 大学特許価値向上支援

    Awarding organization:科学技術振興機構

    馬場 暁

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  • Multiple SP Combined Excitations in Nanostructured Organic Films and Application to High-Efficiency Devices

    Grant number:24560367

    2012.4 - 2015.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    KATO Keizo, SHINBO Kazunari, BABA Akira

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    Grant type:Competitive

    Grant amount:\5330000 ( Direct Cost: \4100000 、 Indirect Cost:\1230000 )

    The surface plasmon (SP) excitations were examined for the metal and organic thin films with grating structures in detail. The multiple SP excitations combined with the grating-coupled SP excitation and the localized SP excitation due to metal particles were also investigated. Furthermore, transmission SP excitation and long-range SP excitation were also investigated. It was found that the multiple SP combined excitations are useful for the development of high-efficiency organic devices.

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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

    2011.8 - 2012.3

    System name: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

    Awarding organization:科学技術振興機構

    馬場 暁

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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

    2011.4 - 2013.3

    System name:科学研究費(若手研究(B))

    Awarding organization:日本学術振興会

    馬場 暁

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    Authorship:Principal investigator  Grant type:Competitive

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  • In-situ Evaluation of Nano-structure Using an Optical-Waveguide-Spectroscopy/Quartz-Crystal-Microbalance Combination Method and Preparation of High-performance Device

    Grant number:23560362

    2011 - 2013

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    SHINBO Kazunari, BABA Akira, KANEKO Futao, KATO Keizo

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    Grant amount:\5460000 ( Direct Cost: \4200000 、 Indirect Cost:\1260000 )

    In this study, a quartz-crystal-microbalance (QCM) and optical-waveguide-spectroscopy hybrid sensor was prepared and evaluation of functional organic thin film during deposition process was conducted. A measurement system was developed and a relationship between optical property and thickness of vacuum evaporated organic thin film was investigated. Thin films of lead phthalocyanine (PbPc), one of promising solar cell material, were mainly studied. The aggregate formation and molecular orientation and their substrate temperature and substrate surface treatment dependences were investigated in a thickness range from sub-monolayer to several tens of nanometers. Furthermore, QCM and surface-plasmon-resonance hybrid sensor was prepared and evaluations of functional organic thin films were conducted during deposition processes in air and water.

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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

    2010.10 - 2011.3

    System name: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

    Awarding organization:科学技術振興機構

    馬場 暁

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    Authorship:Principal investigator  Grant type:Competitive

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  • Fabrication of Electrospun Nano-Fibers and Applications to ElectronicDevices

    Grant number:21360146

    2009 - 2012

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    KANEKO Futao, KATO Keizo, SHINBO Kazunari, BABA Akira

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    Grant amount:\17680000 ( Direct Cost: \13600000 、 Indirect Cost:\4080000 )

    Various polymer nanofibers were fabricated using electrospinning method with a copper wire in the capillary tube as an electrode, and fundamental device applications have been investigated using the fibers. A soluble carbazole precursor polymer with gold nanoparticles was fabricated using this method and then was cross-linked by applying potential cycles to be converted to conjugated polymer fibers. The fluorescence from the conjugated fibers was dependent on the rate of the conversion, doping and the amount of gold nanoparticles. A biosensor using electrospun fibers detecting human immunoglobulin G was fabricated utilizing long-range surface plasmon resonance with stronger evanescent waves than that of conventional surface plasmon, and the sensing property was shown for the biosensor.

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  • Fabrication and Applications of Aligned Conducting Polymers-Carbon Nanotubes Hybrid Thin Films by Electropolymerization

    Grant number:19810005

    2007 - 2008

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (Start-up)

    Research category:Grant-in-Aid for Young Scientists (Start-up)

    Awarding organization:Japan Society for the Promotion of Science

    BABA Akira

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    Grant amount:\3115000 ( Direct Cost: \2710000 、 Indirect Cost:\405000 )

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Teaching Experience (researchmap)

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Teaching Experience

  • 電子物性工学II

    2024
    Institution name:新潟大学

  • 電子材料物性特論

    2024
    Institution name:新潟大学

  • 工学リテラシー入門(建築分野)

    2023
    Institution name:新潟大学

  • 工学リテラシー入門(力学分野)

    2023
    Institution name:新潟大学

  • 工学リテラシー入門(化学材料分野)

    2023
    Institution name:新潟大学

  • 電子情報通信実験II

    2023
    Institution name:新潟大学

  • 工学リテラシー入門(融合領域分野)

    2023
    Institution name:新潟大学

  • 最先端技術を支える化学 I

    2023
    -
    2022
    Institution name:新潟大学

  • 国際マーケット・グループワーク・インターンシップB

    2022
    Institution name:新潟大学

  • 先端的国際工学概論

    2022
    Institution name:新潟大学

  • 国際テクノロジー・グループワーク・インターンシップB

    2022
    Institution name:新潟大学

  • 国際テクノロジー・グループワーク・インターンシップA

    2022
    Institution name:新潟大学

  • 国際マーケット・グループワーク・インターンシップA

    2022
    Institution name:新潟大学

  • 電子情報通信実験I

    2022
    Institution name:新潟大学

  • 高度先端的国際工学概論

    2022
    Institution name:新潟大学

  • 高度先端的国際工学特論I

    2022
    Institution name:新潟大学

  • 先端的国際リサーチ・インターンシップ

    2022
    Institution name:新潟大学

  • 高度先端的国際リサーチ・インターンシップ

    2022
    Institution name:新潟大学

  • 国際工学概論

    2022
    Institution name:新潟大学

  • 高度先端的国際工学特論II

    2022
    Institution name:新潟大学

  • 自然科学総論III

    2021
    Institution name:新潟大学

  • 論文輪講I

    2020
    Institution name:新潟大学

  • 論文輪講II

    2020
    Institution name:新潟大学

  • 電子情報通信設計製図

    2020
    Institution name:新潟大学

  • 電子情報通信実験IIB

    2020
    -
    2022
    Institution name:新潟大学

  • 電子情報通信実験IIA

    2020
    -
    2022
    Institution name:新潟大学

  • 電子情報通信実験IB

    2020
    -
    2021
    Institution name:新潟大学

  • 電子情報通信実験IA

    2020
    -
    2021
    Institution name:新潟大学

  • 工学リテラシー入門(情報電子分野)

    2019
    Institution name:新潟大学

  • 電子デバイスII

    2019
    Institution name:新潟大学

  • 総合技術科学演習

    2019
    Institution name:新潟大学

  • 論文輪講

    2019
    Institution name:新潟大学

  • プログラミング基礎Ⅰ

    2017
    -
    2018
    Institution name:新潟大学

  • 技術英語

    2016
    Institution name:新潟大学

  • 電子デバイス工学

    2016
    -
    2018
    Institution name:新潟大学

  • 工学リテラシー入門(電気電子工学科)

    2016
    Institution name:新潟大学

  • 技術英語入門

    2016
    Institution name:新潟大学

  • 卒業研究

    2014
    Institution name:新潟大学

  • 電気計測

    2014
    Institution name:新潟大学

  • 卒業研修

    2014
    Institution name:新潟大学

  • 電気電子創造設計

    2014
    -
    2016
    Institution name:新潟大学

  • エレクトロニクスへの招待

    2014
    -
    2016
    Institution name:新潟大学

  • 半導体デバイス

    2014
    -
    2016
    Institution name:新潟大学

  • アドバンストテクノロジー

    2009
    -
    2015
    Institution name:新潟大学

  • 分子エレクトロニクス特論

    2008
    Institution name:新潟大学

  • 有機エレクトロニクス特論

    2008
    Institution name:新潟大学

  • エレクトロニクス入門

    2008
    -
    2016
    Institution name:新潟大学

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