2026-03-05T08:43:16Z 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 30314842 川上, 烈生 カワカミ, レツオ Kawakami, Retsuo 川上 カワカミ Kawakami 烈生 レツオ Retsuo Miyaji, Yuki 40314851 柳谷, 伸一郎 ヤナギヤ, シンイチロウ Yanagiya, Shin-ichiro 柳谷 ヤナギヤ Yanagiya 伸一郎 シンイチロウ Shin-ichiro 40380117 白井, 昭博 シライ, アキヒロ Shirai, Akihiro 白井 シライ Shirai 昭博 アキヒロ Akihiro コインカー, パンカジ コインカー, パンカジ Koinkar, Pankaj コインカー コインカー Koinkar パンカジ パンカジ Pankaj 30357933 古部, 昭広 フルベ, アキヒロ Furube, Akihiro 古部 フルベ Furube 昭広 アキヒロ Akihiro Nakano, Yoshitaka Niibe, Masahito embargoed access © 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/ 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. Elsevier 2025-04-22 eng journal article AM 433521 https://tokushima-u.repo.nii.ac.jp/records/2013234 https://doi.org/10.1016/j.apsusc.2025.163328 10.1016/j.apsusc.2025.163328 18735584 01694332 AA1152169X Applied Surface Science 702 163328 https://tokushima-u.repo.nii.ac.jp/record/2013234/files/apsusc_702_163328.pdf application/pdf 1.7 MB 2027-04-22