研究者詳細 - 亀山　達矢

論文 - 亀山　達矢

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[Paper] Green Electroluminescence Generated by Band-edge Transition in Ag-In-Ga-S/GaSx Core/shell Quantum Dots

Genichi Motomura, Yukiko Iwasaki, Tatsuya Kameyama, Tsukasa Torimoto, Taro Uematsu, Susumu Kuwabata, Toshimitsu Tsuzuki

ITE Transactions on Media Technology and Applications 9 巻 ( 4 ) 頁： 222 - 227 2021年

Synthesis of ring-shaped Ag-Pt nanoparticles for the application to plasmon-enhanced electrocatalysts

Kameyama Tatsuya, Ota Naoki, Sasamoto Kosuke, Torimoto Tsukasa

OPTICAL MANIPULATION AND STRUCTURED MATERIALS CONFERENCE 2021 11926 巻 2021年

Electroluminescence from band-edge-emitting AgInS2/GaSx core/shell quantum dots 査読有り

Motomura Genichi, Ogura Kei, Iwasaki Yukiko, Uematsu Taro, Kuwabata Susumu, Kameyama Tatsuya, Torimoto Tsukasa, Tsuzuki Toshimitsu

APPLIED PHYSICS LETTERS 117 巻 ( 9 ) 頁： 091101 - 091101 2020年8月

Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation 査読有り

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

RSC ADVANCES 10 巻 ( 48 ) 頁： 28516 - 28522 2020年8月

Controlling the visible-light driven photocatalytic activity of alloyed ZnSe-AgInSe2quantum dots for hydrogen production 査読有り国際共著

Hsieh Ping-Yen, Kameyama Tatsuya, Takiyama Takayuki, Masuoka Ko, Yamamoto Takahisa, Hsu Yung-Jung, Torimoto Tsukasa

JOURNAL OF MATERIALS CHEMISTRY A 8 巻 ( 26 ) 頁： 13142 - 13149 2020年7月

Hot electron transfer in Zn-Ag-In-Te nanocrystal-methyl viologen complexes enhanced with higher-energy photon excitation 査読有り

Kameyama Tatsuya, Sugiura Kouta, Kuwabata Susumu, Okuhata Tomoki, Tamai Naoto, Torimoto Tsukasa

RSC ADVANCES 10 巻 ( 28 ) 頁： 16361 - 16365 2020年4月

Tailored Photoluminescence Properties of Ag(In,Ga)Se2 Quantum Dots for Near-Infrared In Vivo Imaging 査読有り

Kameyama Tatsuya, Yamauchi Hiroki, Yamamoto Takahisa, Mizumaki Toshiki, Yukawa Hiroshi, Yamamoto Masahiro, Ikeda Shigeru, Uematsu Taro, Baba Yoshinobu, Kuwabata Susumu, Torimoto Tsukasa

ACS APPLIED NANO MATERIALS 3 巻 ( 4 ) 頁： 3275 - 3287 2020年4月

Synthesis of submicron-sized CdS particles using reverse micelles 査読有り

Minowa Yosuke, Kuramoto Shohei, Kameyama Tatsuya, Torimoto Tsukasa, Ashida Masaaki

JOURNAL OF NANOPHOTONICS 14 巻 ( 2 ) 頁： 1 - 1 2020年4月

Efficient quantum-dot light-emitting diodes using ZnS-AgInS2 solid-solution quantum dots in combination with organic charge-transport materials 査読有り

Motomura Genichi, Ogura Kei, Kameyama Tatsuya, Torimoto Tsukasa, Uematsu Taro, Kuwabata Susumu, Tsuzuki Toshimitsu

APPLIED PHYSICS LETTERS 116 巻 ( 9 ) 2020年3月

Temperature dependences of photoluminescence intensities observed from AgInGaS and AgInGaS/GaSx core-shell nanoparticles 査読有り

Ichimiya Masayoshi, Kameyama Tatsuya, Torimoto Tsukasa, Uematsu Taro, Kuwabata Susumu, Ashida Masaaki

JOURNAL OF NANOPHOTONICS 14 巻 ( 1 ) 頁： 1 - 1 2020年1月

Enhancement of electrocatalytic oxygen reduction reaction on Au-Ag nanorings by plasmon excitation 査読有り

Kameyama Tatsuya, Sasamoto Kosuke, Torimoto Tsukasa

OPTICAL MANIPULATION AND STRUCTURED MATERIALS CONFERENCE 2020 11522 巻 2020年

Nanotraffic Lights: Rayleigh Scattering Microspectroscopy of Optically Trapped Octahedral Gold Nanoparticles 査読有り

Shoji Tatsuya, Tamura Mamoru, Kameyama Tatsuya, Iida Takuya, Tsuboi Yasuyuki, Torimoto Tsukasa

JOURNAL OF PHYSICAL CHEMISTRY C 123 巻 ( 37 ) 頁： 23096 - 23102 2019年9月

Non-destructive dispersion of quantum dots into buffer gases toward their optical manipulation

Mitsutaka Kumakura, Yuta Baba, Takayuki Shimomura, Takayuki Takiyama, Tatsuya Kameyama, Tsukasa Torimoto, Takeshi Moriyasu

Proceedings of SPIE 11141 巻頁： 1114101-161 - 1114101-163 2019年9月

Enhanced Photoelectrochemical Properties of Zn-Ag-In-Te Nanocrystals with High Energy Photon Excitation 査読有り

Kameyama Tatsuya, Sugiura Kouta, Kuwabata Susumu, Okuhata Tomoki, Tamai Naoto, Torimoto Tsukasa

CHEMNANOMAT 5 巻 ( 8 ) 頁： 1028 - 1035 2019年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Multinary nanocrystals (NCs) of I-III-VI-based semiconductors with less toxicity have attracted much attention for the fabrication of efficient light-energy conversion systems. Here we report unique photoelectrochemical properties of ZnTe−AgInTe2 solid solution (ZAITe) NCs with a controllable energy gap in near-IR region. The photoelectrochemical behavior of ZAITe NCs immobilized on an ITO electrode with a thickness of less than one monoparticle layer, resembling a p-type semiconductor photoresponse, was remarkably different from that of ZAITe NC multilayer films: The onset of a cathodic photocurrent was shifted more positively than that of the valence band maximum of ZAITe NCs and the photocurrent generation efficiency was significantly increased, when photons with energy higher than ca. 2.5 eV were irradiated. These phenomena can be explained well by the direct hot hole transfer from ZAITe NCs to the ITO electrode.

DOI： 10.1002/cnma.201900241

Web of Science

Scopus

Nanotraffic Lights: Rayleigh Scattering Microspectroscopy of Optically Trapped Octahedral Gold Nanoparticles 査読有り

Tatsuya Shoji, Mamoru Tamura, Tatsuya Kameyama, Takuya Iida, Yasuyuki Tsuboi, Tsukasa Torimoto

The Journal of Physical Chemistry C 123 巻 ( 37 ) 頁： 23096 - 23102 2019年8月

Non-destructive dispersion of quantum dots into gases

Kumakura M., Koide D., Shimomura T., Baba Y., Takiyama T., Kameyama T., Torimoto T., Moriyasu T.

12TH INTERNATIONAL CONFERENCE ON EXCITONIC AND PHOTONIC PROCESSES IN CONDENSED MATTER AND NANO MATERIALS (EXCON 2018) 1220 巻 2019年

Wavelength-Tunable Band-Edge Photoluminescence of Nonstoichiometric Ag-In-S Nanoparticles via Ga3+ Doping 査読有り

Kameyama Tatsuya, Kishi Marino, Miyamae Chie, Sharma Dharmendar Kumar, Hirata Shuzo, Yamamoto Takahisa, Uematsu Taro, Vacha Martin, Kuwabata Susumu, Torimoto Tsukasa

ACS APPLIED MATERIALS & INTERFACES 10 巻 ( 49 ) 頁： 42844 - 42855 2018年12月

Photoluminescence characterization of ZnS-AgInS2 (ZAIS) nanoparticles adsorbed on plasmonic chip studied with fluorescence microscopy 査読有り

Minoshima Wataru, Ito Ryuya, Takiyama Takayuki, Kameyama Tatsuya, Torimoto Tsukasa, Tawa Keiko

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 367 巻頁： 347 - 354 2018年12月

Two-photon Absorption Spectrum of Solid Solution Nanocrystals of ZnS-AgInS2

Suzuki Yasutaka, Onishi Shozo, Matsumoto Kazuya, Takiyama Takayuki, Kameyama Tatsuya, Torimoto Tsukasa, Kawamata Jun

CHEMISTRY LETTERS 47 巻 ( 12 ) 頁： 1475 - 1477 2018年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）

© 2018 The Chemical Society of Japan Two-photon absorption behavior of dispersion of solid solution nanocrystals of ZnS-AgInS2 was investigated, the measured maximum two-photon absorption cross-section of this nanoparticle being 3900 GM (1 GM = 10150 cm4 s photon11 mol(particle)11) at 850 nm. The two-photon excited red photoluminescence was observed even by using a femtosecond fiber laser oscillating at 1030 nm.

DOI： 10.1246/cl.180718

Web of Science

Scopus

Narrow band-edge photoluminescence from AglnS2 semiconductor nanoparticles by the formation of amorphous III-VI semiconductor shells

Uematsu Taro, Wajima Kazutaka, Sharma Dharmendar Kumar, Hirata Shuzo, Yamamoto Takahisa, Kameyama Tatsuya, Vacha Martin, Torimoto Tsukasa, Kuwabata Susumu

NPG ASIA MATERIALS 10 巻頁： 713 - 726 2018年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018, The Author(s). Nanoparticles of I–III–VI semiconductors are promising candidates for novel non-toxic fluorescent materials. However, removal of defect levels responsible for their broad-band emission has not been successful to date. The present study demonstrates, for the first time, the coating of core AgInS2 nanoparticles—one of the I–III–VI group semiconductors with a bandgap in the visible region—with III–VI group semiconductors. The AgInS2/InSx and AgInS2/GaSx (x = 0.8–1.5) core/shell structures generate intense narrow-band photoluminescence originating from a band-edge transition at a wavelength shorter than that of the original defect emission. Microscopic analyses reveal that the GaSx shell has an amorphous nature, which is unexpected for typical shell materials such as crystalline lattice-matching ZnS. Single-particle spectroscopy shows that the average linewidth of the band-edge photoluminescence is as small as 80.0 meV (or 24 nm), which is comparable with that of industry-standard II–VI semiconductor quantum dots. In terms of photoluminescence quantum yield, a value of 56% with nearly single-band emission has been achieved as a result of several modifications to the reaction conditions and post-treatment to the core/shell nanoparticles. This work indicates the increasing potential of AgInS2 nanoparticles for use as practical cadmium-free quantum dots.

DOI： 10.1038/s41427-018-0067-9

Web of Science

Scopus

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