2026-03-05T08:55:50Z https://tokushima-u.repo.nii.ac.jp/oai

oai:tokushima-u.repo.nii.ac.jp:02013234 2025-04-28T08:33:50Z 1713853213384:1713853295607

Enhanced photocatalytic activity of TiO2/Au/TiO2/Au stacked nanostructures synthesized via sputtering and subsequent annealing 川上, 烈生 75 カワカミ, レツオ 10706/profile-ja.html Kawakami, Retsuo 30314842 Miyaji, Yuki 柳谷, 伸一郎 130 ヤナギヤ, シンイチロウ 10805/profile-ja.html Yanagiya, Shin-ichiro 40314851 白井, 昭博 1235 シライ, アキヒロ 81910/profile-ja.html Shirai, Akihiro 40380117 コインカー, パンカジ 275 コインカー, パンカジ 164626/profile-ja.html Koinkar, Pankaj 古部, 昭広 763 フルベ, アキヒロ 292878/profile-ja.html Furube, Akihiro 30357933 Nakano, Yoshitaka Niibe, Masahito TiO2 thin film Au nanoparticles IMIM nanostructure Sputtering/subsequent annealing Local surface plasmon resonance Photocatalytic activity We synthesized TiO2/Au/TiO2/Au (IMIM) stacked nanostructure composed of TiO2 thin films (TFs) and Au nanoparticles (NPs). The TFs of TiO2 were deposited by sputtering Ti targets in Ar/O2 gas, followed by annealing to induce the anatase phase. The Au NPs were deposited by sputtering an Au target in Ar gas and then annealed to form the NPs. The nanostructures made of TiO2/Au/TiO2 (MIM) and TiO2/Au (IM) were synthesized for the purpose of comparison. The photocatalytic activity was evaluated by measuring organic decomposition and bacterial inactivation under ultraviolet and visible light irradiation, with the visible light wavelength matching the localized surface plasmon resonance (LSPR) of Au NPs. The photocatalytic performance of IMIM was more enhanced than TiO2 TF as the visible light intensity increased. The IMIM also outperformed the MIM and IM nanostructures. The improved photocatalytic activity would be attributed to the hot electron transfer from Au NPs to TiO2, originating from the visible-light-driven LSPR at the TiO2/Au interface at the top of IMIM. Additionally, the increased visible light absorption attributed to more oxygen vacancies in the top TiO2 layer due to Au NPs and a rougher surface due to the top TiO2 layer would enhance the photocatalytic activity. journal article Elsevier 2025-04-22 AM application/pdf Applied Surface Science 702 163328 18735584 01694332 AA1152169X https://tokushima-u.repo.nii.ac.jp/record/2013234/files/apsusc_702_163328.pdf https://tokushima-u.repo.nii.ac.jp/records/2013234 eng © 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/