Updated on 2023/04/28

写真a

 
AKIYOSHI Kazutaka
 
Organization
Graduate School of Engineering Materials Chemistry 1 Assistant Professor
Undergraduate School
School of Engineering Chemistry and Biotechnology
Title
Assistant Professor

Degree 1

  1. Doctor of Engineering （ 2019.3   The University of Tokyo ） 

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Research Interests 6

  1. イオン液体

  2. 量子ドット

  3. 金属ナノ粒子

  4. 半導体ナノ粒子

  5. プラズモニクス

  6. 光電気化学

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Research Areas 1

  1. Nanotechnology/Materials / Inorganic materials and properties

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Research History 4

  1. Nagoya University   Graduate School of Engineering Materials Chemistry   Assistant Professor

    2023.4

  2. Nagoya University   Graduate School of Engineering Materials Chemistry   Designated assistant professor

    2021.4 - 2023.3

  3. Nagoya University   VBL Postdoctoral Researcher

    2019.4 - 2021.3

  4. The University of Tokyo   JSPS DC1

    2016.4 - 2019.3

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Education 3

  1. The University of Tokyo

    2016.4 - 2019.3

  2. The University of Tokyo

    2014.4 - 2016.3

  3. Tokyo University of Science

    2010.4 - 2014.3

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Professional Memberships 7

  1. The Society of Nano Science and Technology

    2022.4

  2. Plasmonic Chemistry

    2021.2

  3. Division of Colloid and Surface Chemistry

    2020.8

  4. The Japan Society of Applied Physics

    2018.1

  5. The Japanese Photochemistry Association

    2016.7

  6. The Electrochemical Society of Japan

    2015.12

  7. The Chemical Society of Japan

    2013.11

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Awards 11

  1. PVSEC-33 Poster Award

    2022.11   33rd International Photovoltaic Science and Engineering Conference (PVSEC-33)   Controlling Energy Band Structure of Bismuth-based Multinary Quantum Dots Prepared by a Solution-phase Method and Their Photoelectrochemical Properties

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

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    Award type：Award from international society, conference, symposium, etc. 

  2. 令和４年度 若手研究奨励賞

    2022.11   名古屋大学材料バックキャストテクノロジー研究センター  

  3. Certificate of Award for Encouragement of Research 2019

    2019.10   Research Center for Materials Backcasting Technology  

  4. Excellent Poster Award

    2019.9   The Electrochemical Society of Japan   Fabrication and Optical Modulation of MoOx Nanoparticles Prepared with an Ionic Liquid/Metal Sputtering Technique

  5. CSJ Poster Presentation Award 2018 for Excellent Research

    2018.10   The Chemical Society of Japan  

  6. CSJ Poster Presentation Award 2017 for Excellent Research

    2017.10   The Chemical Society of Japan  

  7. Encouragement Award

    2017.2   Institute of Industrial Science, The University of Tokyo  

  8. CSJ Poster Presentation Award 2016 for Excellent Research

    2016.11   The Chemical Society of Japan  

  9. Fujishima Prize

    2016.3   Department of Applied Chemistry, The Graduate School of Engineering, The University of Tokyo  

  10. CSJ Poster Presentation Award 2015 for Excellent Research

    2015.10   The Chemical Society of Japan  

  11. Winning a Prize

    2015.3   Nikkan Kogyo Shimbun, LTD.  

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Papers 9

  1. Composition control of alloy nanoparticles consisting of bulk-immiscible Au and Rh metals via an ionic liquid/metal sputtering technique for improving their electrocatalytic activity Reviewed

    Akiyoshi Kazutaka, Watanabe Yumezo, Kameyama Tatsuya, Kawawaki Tokuhisa, Negishi Yuichi, Kuwabata Susumu, Torimoto Tsukasa

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   Vol. 24 ( 39 ) page： 24335 - 24344   2022.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical chemistry chemical physics : PCCP  

    AuRh bimetallic alloy nanoparticles (NPs) were successfully prepared by simultaneous sputtering of Au and Rh in a room-temperature ionic liquid (RTIL) of N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate (DEME-BF4). Bimetallic AuRh alloy NPs of 1-2 nm in size were formed in the RTIL. The alloy composition was controllable by changing the surface areas of Au and Rh plates used as sputtering targets. Loading thus-obtained AuRh NPs on carbon black (CB) powders increased the size of AuRh NPs to ca. 2-8 nm, depending on the Au/Rh ratio. The electrocatalytic activity for oxygen reduction reaction (ORR) of AuRh NP-loaded CB catalysts showed a volcano-type dependence on their composition, in which AuRh NPs with Au surface coverage of 62% exhibited the optimal ORR activity, the specific activity being ca. 5 times higher than that of pure Rh NPs.

    DOI： 10.1039/d2cp01461k

    Web of Science

    Scopus

    PubMed

  2. Development of plasmonic thin-layer chromatography for size-selective and optical-property-dependent separation of quantum dots Reviewed

    Torimoto Tsukasa, Yamaguchi Naoko, Maeda Yui, Akiyoshi Kazutaka, Kameyama Tatsuya, Nagai Tatsuya, Shoji Tatsuya, Yamane Hidemasa, Ishihara Hajime, Tsuboi Yasuyuki

    NPG ASIA MATERIALS   Vol. 14 ( 1 )   2022.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：NPG Asia Materials  

    Nano-objects, such as quantum dots (QDs), are essential units for the construction of functional materials and devices in current technologies. The establishment of a versatile scheme to sort desired components from a crude product is crucial for bringing out the full potential of the original materials. However, it is still challenging to separate QDs with the same composition on the basis of size and to sort QDs with the same size but different optical properties. Here, we demonstrate such sorting for the first time by combining plasmonic optical trapping with thin-layer chromatography (TLC), which is a widely used tool. LED photoexcitation of the localized surface plasmon resonance of Au nanoparticles immobilized on a TLC plate affected the distance QDs traveled depending on the wavelength and intensity of irradiated light, which led to clear separation according to the size and/or optical properties of the QDs. Since optical property-based separation cannot be achieved by conventional chromatography, in which the interactions between stationary phases of chromatographs and QDs are simply based on differences in the size or surface functionality of the QDs, the present strategy will be a key solution for the establishment of a versatile scheme for sorting nano-objects.

    DOI： 10.1038/s41427-022-00414-3

    Web of Science

    Scopus

  3. Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation Reviewed

    Kazutaka Akiyoshi, Tatsuya Kameyama, Takahisa Yamamoto, Susumu Kuwabata, Tetsu Tatsuma, and Tsukasa Torimoto

    RSC Advances     2020.8

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： https://doi.org/10.1039/D0RA05165A

  4. Development of Cu-In-Ga-S quantum dots with a narrow emission peak for red electroluminescence.

    Jiang C, Tozawa M, Akiyoshi K, Kameyama T, Yamamoto T, Motomura G, Fujisaki Y, Uematsu T, Kuwabata S, Torimoto T

    The Journal of chemical physics   Vol. 158 ( 16 )   2023.4

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    Language：English  

    DOI： 10.1063/5.0144271

    PubMed

  5. Red light-inducible overall water-splitting photocatalyst, gold-inserted zinc rhodium oxide and bismuth vanadium oxide heterojunction, connected using gold prepared by sputtering in ionic liquid Reviewed

    Masaomi Yoda, Toshihiro Takashima, Kazutaka Akiyoshi, Tsukasa Torimoto, and Hiroshi Irie

    Journal of Chemical Physics     2020.7

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

  6. Electrochemical modulation of plasmon-induced charge separation behaviour at Au-TiO<inf>2</inf> photocathodes Reviewed

    Kazutaka Akiyoshi, Tetsu Tatsuma

    Photochemical and Photobiological Sciences   Vol. 18 ( 7 ) page： 1727 - 1731   2019.5

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    Plasmon-induced charge separation (PICS) at the interface between a plasmonic nanoparticle and a semiconductor becomes less efficient as the plasmon resonance wavelength increases, because the energy of a photon may not be sufficiently higher than the interfacial Schottky barrier height. In this study, we developed PICS photocathodes by coating Au nanoparticles of different sizes on an ITO electrode with a thin TiO layer, and applied negative potentials to those photocathodes so as to suppress back electron transfer and improve the PICS photocurrent responses. The photocurrent enhancement factor was increased as the particle size was decreased, and enhancement of about two orders of magnitude was observed for small Au nanoparticles when bias voltage of 0.5 V was applied. In some cases the photocurrent enhancement was accompanied by a slight redshift of the photocurrent peak, which was caused by a lowered barrier. This technique would be useful for tuning the photocurrents when it is applied to devices such as electrochemical LSPR sensors and photodetectors. 2

    DOI： 10.1039/c9pp00098d

    Scopus

    PubMed

  7. Plasmonic-Diffractive Hybrid Sensors Based on a Gold Nanoprism Array Reviewed

    Kazutaka Akiyoshi, Yoshito Y. Tanaka, Takuya Ishida, Tsutomu Shimura, Tetsu Tatsuma

    ACS Applied Nano Materials   Vol. 1 ( 11 ) page： 5994 - 5999   2018.11

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    In order to improve the performance of localized surface plasmon resonance (LSPR) sensors, lattice plasmons of plasmonic nanoparticle (NP) arrays are often used. The lattice plasmon sensors based on coupling between LSPR of each NP and diffraction of the NP array generally have a higher ability to detect local refractive index changes than conventional LSPR sensors based on random NP ensembles. However, the surface selectivity of the lattice plasmon sensors is lower than that of the LSPR sensors because the local electric field of the former extends far from the particle array surface. In this work, we develop a novel plasmonic-diffractive hybrid sensor that can simultaneously determine both local and bulk refractive indices from two output signals, namely, extinction dip and peak, the wavelengths of which are differently dependent on those indices. The hybrid sensor can evaluate the refractive index changes in the immediate vicinity of the sensor surface by canceling the difference in the bulk refractive index between the sample and standard solutions.

    DOI： 10.1021/acsanm.8b01829

    Scopus

  8. Enhancement of plasmon-induced charge separation efficiency by coupling silver nanocubes with a thin gold film Reviewed

    Kazutaka Akiyoshi, Koichiro Saito, Tetsu Tatsuma

    Journal of Photonics for Energy   Vol. 6 ( 4 )   2016.10

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    Plasmon-induced charge separation (PICS), in which an energetic electron is injected from a plasmonic nanoparticle (NP) to a semiconductor on contact, is often inhibited by a protecting agent adsorbed on the NP. We addressed this issue for an Ag nanocube-TiO system by coating it with a thin Au layer or by inserting the Au layer between the nanocubes (NCs) and TiO . Both of the electrodes exhibit much higher photocurrents due to PICS than the electrodes without the Au film or the Ag NCs. These photocurrent enhancements can be explained in terms of PICS with accelerated electron transfer, in which electron injection from the Ag NCs or Ag@Au core-shell NCs to TiO is promoted by the Au film, or PICS enhanced by a nanoantenna effect, in which the electron injection from the Au film to TiO is enhanced by optical near field generated by the Ag NC. 2 2 2 2

    DOI： 10.1117/1.JPE.6.042505

    Scopus

  9. Direct output of electrical signals from LSPR sensors on the basis of plasmon-induced charge separation Reviewed

    Tetsu Tatsuma, Yu Katagi, Satoshi Watanabe, Kazutaka Akiyoshi, Tokuhisa Kawawaki, Hiroyasu Nishi, Emiko Kazuma

    Chemical Communications   Vol. 51 ( 28 ) page： 6100 - 6103   2015.2

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    Publishing type：Research paper (scientific journal)  

    Potentiometric and conductometric sensors based on localized surface plasmon resonance were developed. The sensors can be applied to coloured and turbid samples because light need not pass through the sample solution.

    DOI： 10.1039/c5cc01020a

    Scopus

    PubMed

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MISC 4

  1. Synthesis and electrocatalytic reactivity of AuRh alloy nanoparticles by ionic liquid/metal sputtering

    秋吉一孝, 秋吉一孝, 渡辺夢三, 亀山達矢, 川脇徳久, 桑畑進, 鳥本司, 鳥本司

    電気化学会大会講演要旨集(CD-ROM)   Vol. 88th   2021

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  2. Preparation of Core-shell-structured Au@Ni Nanoparticles with Ionic Liquid/Metal Sputtering and Their Electrocatalytic Activity for Urea Oxidation

    伊藤由実, 秋吉一孝, 亀山達矢, 桑畑進, 鳥本司

    電気化学会東北支部セミコンファレンス・東北若手の会(CD-ROM)   Vol. 52nd   2021

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  3. Improvement of Plasmonic TLC Performance for Precise Separation of Multinary Quantum Dots

    前田結衣, 山口奈緒子, 秋吉一孝, 亀山達矢, 坪井泰之, 石原一, 鳥本司

    電気化学秋季大会講演要旨集(CD-ROM)   Vol. 2021   2021

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  4. Colloidal Synthesis of Ternary Ag-Bi-S Quantum Dots and the Control of Their Photochemical Properties

    秋吉一孝, ZHANG Wentao, 亀山達矢, 鳥本司

    電気化学秋季大会講演要旨集(CD-ROM)   Vol. 2021   2021

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Presentations 27

  1. Size- and Composition-dependent Photoelectrochemical Properties of Colloidally Synthesized AgBiS2 Quantum Dots

    Wentao Zhang, Kazutaka Akiyoshi, Tatsuya Kameyama, and Tsukasa Torimoto

    2022.11.20 

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    Event date： 2022.11

    Language：Japanese   Presentation type：Oral presentation (general)  

  2. Fabrication of PtIr Alloy Nanoparticles by an Ionic Liquids/Metal Sputtering Technique and Their Size-dependent Electrocatalytic Activity

    Yixiong Liu, Kazutaka Akiyoshi, Tatsuya Kameyama, Susumu Kuwabata, and Tsukasa Torimoto

    2022.11.21 

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    Event date： 2022.11

    Language：Japanese   Presentation type：Oral presentation (general)  

  3. Controlling Energy Band Structure of Bismuth-based Multinary Quantum Dots Prepared by a Solution-phase Method and Their Photoelectrochemical Properties

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

    33rd International Photovoltaic Science and Engineering Conference (PVSEC-33)  2022.11.16 

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    Event date： 2022.11

    Language：English   Presentation type：Poster presentation  

  4. Preparation of Core-shell-structured Au@Ni Nanoparticles with an Ionic Liquid/Metal Sputtering Technique and Their Electrocatalytic Activity for Urea Oxidation

    Yumi ITO, Kazutaka AKIYOSHI, Tatsuya KAMEYAMA, Susumu KUWABATA, Tsukasa TORIMOTO

    The 73rd Divisional Meeting of Division of Colloid and Surface Chemistry  2022.9.21 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  5. Solution-phase Syntheses and Photochemical Properties of Bi-based Multinary Metal Sulfide Quantum Dots

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

    Annual Meeting on Photochemistry 2022  2022.9.13 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  6. Plasmonic Thin-layer Chromatography for Size and Optical Properties Dependent Trapping of Quantum Dots Invited International conference

    Kazutaka Akiyoshi, Yui Maeda, Naoko Yamaguchi, Tatsuya Kameyama, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    The 6th International Workshop on Advanced Nanoscience and Nanomaterials 2022 (IWANN2022)  2022.8.1 

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    Event date： 2022.8

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

  7. Plasmonic Thin-layer Chromatography for Precise Separation of Less-Toxic Multinary Quantum Dots by Size, Shape, and Optical Property International conference

    Kazutaka Akiyoshi, Yui Maeda, Naoko Yamaguchi, Tatsuya Kameyama, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    The 13th Asia-Pacific Conference on Near-Field Optics (APNFO13)  2022.7.29 

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    Event date： 2022.7

    Language：English   Presentation type：Oral presentation (general)  

  8. Solution-phase Syntheses and Photochemical Properties of Silver Bismuth Sulfide Nanoparticles International conference

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

    241st ECS Meeting  2022.5.31 

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    Event date： 2022.5 - 2022.6

    Language：English   Presentation type：Oral presentation (general)  

  9. Precise Separation of Less-Toxic Multinary Quantum Dots by Size, Shape and Photochemical Property with Plasmonic Thin-layer Chromatography

    Kazutaka Akiyoshi, Yui Maeda, Naoko Yamaguchi, Tatsuya Kameyama, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    The Society of Nano Science and Technology 20th Annual Meeting  2022.5.21 

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    Event date： 2022.5

    Presentation type：Oral presentation (general)  

  10. Controlling band structures of Ag-Bi-S and Bi-S nanoparticles with particle size and composition and their photoelectrochemical properties

    Wentao Zhang, Kazutaka Akiyoshi, Tatsuya Kameyama, Tsukasa Torimoto

    The Society of Nano Science and Technology 20th Annual Meeting  2022.5.21 

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    Event date： 2022.5

    Presentation type：Oral presentation (general)  

  11. Fabrication of PtIr alloy nanoparticles by ionic liquids/metal sputtering and their electrocatalytic activity for ammonia oxidation

    Yixiong Liu, Kazutaka Akiyoshi, Tatsuya Kameyama, Susumu Kuwabata, Tsukasa Torimoto

    The Society of Nano Science and Technology 20th Annual Meeting  2022.5.20 

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    Event date： 2022.5

    Language：Japanese   Presentation type：Poster presentation  

  12. Solution-phase synthesis of Ag-Bi-S quantum dots for the application to photovoltaics

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

    The 102th Annual Meeting of The Chemical Society of Japan  2022.3.25 

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    Event date： 2022.3

    Presentation type：Oral presentation (general)  

  13. Preparation of Core-shell-structured Au@Ni Nanoparticle Films via Metal Sputter Deposition and Improvement of Electrocatalytic Activity for Urea Oxidation

    Yumi Ito, Kazutaka Akiyoshi, Tatsuya Kameyama, Susumu Kuwabata, Tsukasa Torimoto

    The 89th ECSJ Spring Meeting  2022.3.17 

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    Event date： 2022.3

    Presentation type：Oral presentation (general)  

  14. Precise Separation of Multinary Quantum Dots with Different Shapes and Photochemical Properties by Plasmon TLC

    Kazutaka Akiyoshi, Yui Maeda, Naoko Yamaguchi, Tatsuya Kameyama, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    The 89th ECSJ Spring Meeting  2022.3.15 

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    Event date： 2022.3

    Presentation type：Oral presentation (general)  

  15. Size separation of quantum dots with Ag-based plasmonic thin layer chromatography

    Yui Maeda, Naoko YAMAGUCHI, Kazutaka Akiyoshi, Tatsuya Kameyama, Tatsuya Shoji, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    2021 International Chemical Congress of Pacific Basin Societies (PACICHEM2021)  2021.12.20 

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    Event date： 2021.12

    Language：English   Presentation type：Poster presentation  

  16. Development of plasmonic thin layer chromatography for size separation of quantum dots

    Tsukasa Torimoto, Naoko YAMAGUCHI, Yui Maeda, Kazutaka Akiyoshi, Tatsuya Kameyama, Tatsuya Shoji, Yasuyuki Tsuboi, Hajime Ishihara

    2021 International Chemical Congress of Pacific Basin Societies (PACICHEM2021)  2021.12.21 

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    Event date： 2021.12

    Language：English   Presentation type：Oral presentation (general)  

  17. Photoelectrochemical properties of plasmonic molybdenum oxide nanoparticles prepared by an ionic liquid/metal sputtering technique International conference

    Kazutaka Akiyoshi, Tatsuya Kameyama, Susumu Kuwabata, Tsukasa Torimoto

    2021 International Chemical Congress of Pacific Basin Societies (PACICHEM2021)  2021.12.19 

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    Event date： 2021.12

    Language：English   Presentation type：Oral presentation (general)  

  18. Preparation of Core-shell-structured Au@Ni Nanoparticles with Ionic Liquid/Metal Sputtering and Their Electrocatalytic Activity for Urea Oxidation

    Yumi Ito, Kazutaka Akiyoshi, Tatsuya Kameyama, Susumu Kuwabata, Tsukasa Torimoto

    2021.11.22 

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    Event date： 2021.11

  19. プラズモン共鳴を用いた光電気化学センサ及び近赤外光電変換素子の開発 Invited

    秋吉 一孝

    2020年度 プラズモニック化学研究会「次世代プラズモニック化学への挑戦」  2021.3.5 

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    Presentation type：Oral presentation (general)  

  20. Preparation of a AuNi Nanoparticle Film by Ionic Liquid/Metal Sputtering Method

    Yumi ITO, Kazutaka AKIYOSHI, Tatsuya KAMEYAMA, Tsukasa TORIMOTO

    2021.9.17 

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    Presentation type：Poster presentation  

  21. Preparation of Core-shell-structured Au@Ni Nanoparticles with Metal Sputtering and Their Electrocatalytic Activity for Urea Oxidation

    Yumi ITO, Kazutaka AKIYOSHI, Tatsuya KAMEYAMA, Susumu KUWABATA, Tsukasa TORIMOTO

    50th Anniversary Event of the Electrochemical Society Hokkaido Chapter  2022.6.11 

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    Presentation type：Poster presentation  

  22. イオン液体／金属スパッタリングによる固溶型AuRh合金ナノ粒子の合成と酸素還元反応に対する電極触媒活性

    秋吉一孝, 渡辺夢三, 亀山達矢, 川脇徳久, 桑畑進, 鳥本司

    電気化学会第88回大会  2021.3.22 

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    Language：Japanese   Presentation type：Oral presentation (general)  

  23. Control of Oxidation State and Photoelectrochemical Properties of MoOx Nanoparticles Prepared with an Ionic Liquid/Metal Sputtering Technique

    Kazutaka Akiyoshi, Tatsuya Kameyama, Tsukasa Torimoto

    2021.1.19 

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    Presentation type：Poster presentation  

  24. Improvement of Plasmon TLC Properties for High Precision Separation of Multinary Quantum Dots

    Yui Maeda, Naoko Yamaguchi, Kazutaka Akiyoshi, Tatsuya Kameyama, Yasuyuki Tsuboi, Hajime Ishihara, Tsukasa Torimoto

    2021.9.8 

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    Presentation type：Oral presentation (general)  

  25. Colloidal Synthesis of Ternary Ag-Bi-S Quantum Dots and the Control of Their Photochemical Properties

    Kazutaka Akiyoshi, Wentao Zhang, Tatsuya Kameyama, Tsukasa Torimoto

    2021.9.9 

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    Presentation type：Oral presentation (general)  

  26. Preparation of AgBiS2 nanoparticles and their optical properties

    Wentao ZHANG, Kazutaka AKIYOSHI, Tatsuya KAMEYAMA, Tsukasa TORIMOTO

    2021.9.17 

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    Presentation type：Poster presentation  

  27. Agナノ粒子を用いるプラズモンTLCの作製と量子ドットのサイズ分離への応用

    前田結衣, 山口奈緒子, 秋吉一孝, 亀山達矢, 坪井泰之, 石原一, 鳥本司

    電気化学会第88回大会  2021.3.22 

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    Presentation type：Oral presentation (general)  

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KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. ドーパント分布を制御したプラズモニック化合物ナノ粒子による新規光電変換素子の開発

    Grant number：21K14703  2021.4 - 2023.3

    若手研究

    秋吉 一孝

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    Authorship：Principal investigator 

    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

  2. プラズモン誘起電荷分離を用いた新規バイオセンサの開発

    Grant number：16J07685  2016.4 - 2019.3

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

    秋吉 一孝

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    今年度は下記の2点に大別した、局在表面プラズモン共鳴（LSPR）センサの高性能化を達成し、成果を学会発表や学術論文により報告することができた。
    ①金ナノ粒子を酸化チタンで被覆した系に対し、適切な電位を印加することにより、LSPRに基づく電荷分離（PICS）が起こる波長や効率を電気化学的に制御した。この構造ではLSPR が長波長側にシフトしやすく、PICS 効率が低くなりやすいが、印加電位を負側にシフトさせると、カソード光電流が増大した。また、光電流ピークは元の吸収ピークの位置に近づくように長波長シフトした。これは、酸化チタン内のバンド曲がりが大きくなり、金ナノ粒子から酸化チタンに注入された電子の、金ナノ粒子への逆電子移動が抑制された効果と、ショットキー障壁が低くなり、酸化チタンへの電子移動が促進された効果などによるものと推察された。これを粒子近傍の屈折率変化に基づくバイオセンシングに利用すれば、出力信号をより大きくし、検出しやすくできると期待される。
    ②金ナノプリズムを光の波長程度の間隔で周期的に配列させ、粒子近傍と溶液バルクの屈折率変化を同時かつ定量的に評価できる新規プラズモン-回折ハイブリッドセンサを開発した。粒子近傍と溶液バルクの屈折率の両方に選択性の高い、LSPR由来のピークだけでなく、溶液バルクの屈折率に選択性の高い、回折由来のディップについてもセンサ応答として利用することで、粒子近傍と溶液バルクの屈折率変化を同時に得られることを、実験と電磁場シミュレーションから裏付けた。これは、試料溶液と標準溶液との屈折率差による影響を排除して、センサ近傍のみの屈折率変化を評価することに役立ち、他の新規マルチ応答センサの開発にもつながると期待される。
    以上のように、当初の予定とは違う方向へも進展したが、その結果、種々の新規な知見が得られ、プラズモンセンサ特性の改善などに応用できた。

  3. Development of Single Particle Potential-Scanning Plasmonic Sensors toward Three-Dimensional Mapping

    Grant number：16K14017  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    Tatsuma Tetsu, NISHI Hiroyasu, KAWAWAKI Tokuhisa, SAITO Koichiro, WU Ling, AKIYOSHI Kazutaka

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    Gold nanorods were immobilized on a transparent electrode and a scattering spectrum was obtained from each nanorod by dark-field microspectroscopy. The potential of the electrode was scanned so that potential-scanning scattering spectrum was obtained at a specific wavelength. The peak potential was negatively shifted as the local refractive index increased. A single plasmonic nanoparticle can therefore be employed for affinity sensing and two-dimensional mapping should also be possible by using a nanoparticle ensemble. Gold nanorod dimers exhibited higher refractive index sensitivities than single nanorods in both potential-scanning and conventional wavelength-scanning based plasmon sensing. We also prepared plasmonic nanoparticle arrays on a transparent electrode by a lithographic method.

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Industrial property rights 2

  1. 第１半導体ナノ粒子及びその製造方法、第２半導体ナノ粒子及びその製造方法、並びにバンドギャップ制御方法

    鳥本 司, 亀山 達矢, 秋吉 一孝, 江 暢

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    Application no：特願2023-034498  Date applied：2023.3

  2. SEPARATOR AND SEPARATION METHOD OF STATIONARY PHASE MEMBER AND NANOSTRUCTURE

    TORIMOTO Tsukasa, KAMEYAMA Tatsuya, YAMAGUCHI Naoko, TAKEOKA Yukikazu, AKIYOSHI Kazutaka, MAEDA Yui, TSUBOI Yasuyuki, ISHIHARA Hajime

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    Application no：特願2019-84653  Date applied：2019.4

    Announcement no：特開WO/2020/218313  Date announced：2020.10

    Patent/Registration no：特許PCT/JP2020/017264 

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Social Contribution 1

  1. はかせとあそぼ！花から太陽電池をつくろう！

    Role(s)：Organizing member

    トヨタ産業技術記念館  週末ワークショップ  2022.8

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Media Coverage 3

  1. Plasmon TLC Internet

    Chem-Station  Spotlight Research  No. 422  2022.9

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    Author：Myself 

  2. Development of Photoelectrochemical Sensing and Near-infrared Light to Energy Conversion by Localized Surface Plasmon Resonance of Plasmonic Nanoparticles Promotional material

    The Japanese Photochemistry Association  Photochemistry  Vol.53 No.1 33-36  2022.4

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    Author：Myself 

  3. Development of Photoelectrochemical Sensors and Near-infrared Photovoltaic Devices by using Plasmon Resonance Internet

    2021.9

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    Author：Myself 

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