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14 results on '"Jin, Shota"'

2. Performance Improvement of Triplet–Triplet Annihilation-Based Upconversion Solid Films through Plasmon-Induced Backward Scattering of Periodic Arrays of Ag and Al

Author

Sugawa, Kosuke, primary, Yoshinari, Satoshi, additional, Watanabe, Shiryu, additional, Ishida, Kosuke, additional, Jin, Shota, additional, Takeshima, Naoto, additional, Fukasawa, Toru, additional, Fukushima, Misa, additional, Katoh, Ryuzi, additional, Takase, Kouichi, additional, Tahara, Hironobu, additional, and Otsuki, Joe, additional

Published
2021
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3. MOESM1 of Combined Use of Anisotropic Silver Nanoprisms with Different Aspect Ratios for Multi-Mode Plasmon-Exciton Coupling

Author

Takeshima, Naoto, Sugawa, Kosuke, Tahara, Hironobu, Jin, Shota, Noguchi, Masaki, Yutaro Hayakawa, Yamakawa, Yuhei, and Otsuki, Joe

Abstract

Additional file 1: Figure S1. Geometric models of AgPRs with various LSP resonance wavelengths. Figure S2. A Setup for the irradiation of LED light to a colloidal aqueous solution of Ag nanospheres. Figure S3. Normalized extinction and emission spectra of a toluene solution of TPP (1×10-6 M). Figure S4. Extinction spectra of colloidal aqueous solutions of AgPRs synthesized five times. Figure S5. (a) Enhancement factor of fluorescence obtained from fluorescence excitation spectra for TPP/AgPRs-500, TPP/AgPRs-560, TPP/AgPRs-645, and TPP-ternary (λem = 720 nm) at (i) 435 nm, (ii) 519 nm, (iii) 552 nm, (iv) 596 nm, and (v) 653 nm, respectively. (b) Absorption enhancement at the respective Q-band wavelengths.

Published
2020
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7. Plasmonic Silver Nanoprism-Induced Emissive Mode Control between Fluorescence and Phosphorescence of a Phosphorescent Palladium Porphyrin Derivative

Author

Takeshima, Naoto, primary, Sugawa, Kosuke, additional, Tahara, Hironobu, additional, Jin, Shota, additional, Wakui, Hiroki, additional, Fukushima, Misa, additional, Tokuda, Kyo, additional, Igari, Shuto, additional, Kanakubo, Kotomi, additional, Hayakawa, Yutaro, additional, Katoh, Ryuzi, additional, Takase, Kouichi, additional, and Otsuki, Joe, additional

Published
2019
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9. Precise Control of Localized Surface Plasmon Wavelengths Is Needed for Effective Enhancement of Triplet–Triplet Annihilation-Based Upconversion Emission

Author

Jin, Shota, primary, Sugawa, Kosuke, additional, Takeshima, Naoto, additional, Tahara, Hironobu, additional, Igari, Shuto, additional, Yoshinari, Satoshi, additional, Kurihara, Yuri, additional, Watanabe, Shiryu, additional, Enoki, Masami, additional, Sato, Kenta, additional, Inoue, Wataru, additional, Tokuda, Kyo, additional, Akiyama, Tsuyoshi, additional, Katoh, Ryuzi, additional, Takase, Kouichi, additional, Ozawa, Hiroaki, additional, Okazaki, Toshiya, additional, Watanabe, Takayuki, additional, and Otsuki, Joe, additional

Published
2018
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13. Photocurrent enhancement of porphyrin molecules over a wide-wavelength region based on combined use of silver nanoprisms with different aspect ratios

Author

Sugawa, Kosuke, primary, Takeshima, Naoto, additional, Uchida, Koji, additional, Tahara, Hironobu, additional, Jin, Shota, additional, Tsunenari, Natsumi, additional, Akiyama, Tsuyoshi, additional, Kusaka, Yasuyuki, additional, Fukuda, Nobuko, additional, Ushijima, Hirobumi, additional, Tsuchido, Yuji, additional, Hashimoto, Takeshi, additional, Hayashita, Takashi, additional, and Otsuki, Joe, additional

Published
2015
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14. Efficient Photocurrent Enhancement from Porphyrin Molecules on Plasmonic Copper Arrays: Beneficial Utilization of Copper Nanoanntenae on Plasmonic Photoelectric Conversion Systems

Author

Sugawa, Kosuke, Yamaguchi, Daisuke, Tsunenari, Natsumi, Uchida, Koji, Tahara, Hironobu, Takeda, Hideyuki, Tokuda, Kyo, Jin, Shota, Kusaka, Yasuyuki, Fukuda, Nobuko, Ushijima, Hirobumi, Akiyama, Tsuyoshi, Watanuki, Yasuhiro, Nishimiya, Nobuyuki, Otsuki, Joe, and Yamada, Sunao

Abstract

We demonstrated the usefulness of Cu light-harvesting plasmonic nanoantennae for the development of inexpensive and efficient artificial organic photoelectric conversion systems. The systems consisted of the stacked structures of layers of porphyrin as a dye molecule, oxidation-suppressing layers, and plasmonic Cu arrayed electrodes. To accurately evaluate the effect of Cu nanoantenna on the porphyrin photocurrent, the production of Cu2O by the spontaneous oxidation of the electrode surfaces, which can act as a photoexcited species under visible light irradiation, was effectively suppressed by inserting the ultrathin linking layers consisting of 16-mercaptohexadecanoic acid, titanium oxide, and poly(vinyl alcohol) between the electrode surface and porphyrin molecules. The reflection spectra in an aqueous environment of the arrayed electrodes, which were prepared by thermally depositing Cu on two-dimensional colloidal crystals of silica with diameters of 160, 260, and 330 nm, showed clear reflection dips at 596, 703, and 762 nm, respectively, which are attributed to the excitation of localized surface plasmon resonance (LSPR). While the first dip lies within the wavelengths where the imaginary part of the Cu dielectric function is moderately large, the latter two dips lie within a region of a quite small imaginary part. Consequently, the LSPR excited at the red region provided a particularly large enhancement of porphyrin photocurrent at the Q-band (ca. 59-fold), compared to that on a Cu planar electrode. These results strongly suggest that the plasmonic Cu nanoantennae contribute to the substantial improvement of photoelectric conversion efficiency at the wavelengths, where the imaginary part of the dielectric function is small.

Published
2017
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