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oai:tokushima-u.repo.nii.ac.jp:02011624 2025-04-28T05:57:59Z 1713853213384:1713853295607

Plasma-assisted annealing of Pt-doped rutile TiO2 nanoparticles for enhanced decomposition and bacterial inactivation under general lighting 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 マキノ, ユウタ マキノ, ユウタ Makino, Yuta 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 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 ニイベ, マサヒト ニイベ, マサヒト Niibe, Masahito ナカノ, ヨシタカ ナカノ, ヨシタカ Nakano, Yoshitaka open access This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Retsuo Kawakami et al., J. Vac. Sci. Technol. B 42(1), 012203 (2024) and may be found at https://doi.org/10.1116/6.0003101. Enhanced photocatalytic activity of rutile-based TiO2 materials under general lighting is practically desired. O2 plasma-assisted annealing (PAA) effects on Pt-doped rutile TiO2 nanoparticles were clarified along with its visible-light-driven photocatalytic activity enhancement. The PAA-treated samples were mainly analyzed using optical spectroscopy and x-ray photoelectron spectroscopy (XPS). The photocatalytic activity was assessed by decomposing methylene blue dye and inactivating Bacillus subtilis under general lighting. The PAA treatment changed the O 1s, Ti 2p, and Pt 4f spectra of XPS from those of the pristine sample. This change indicated that the PAA treatment introduced more oxygen deficiency or oxygen vacancies and more oxygen groups adsorbed on the surface. The introduced oxygen vacancies and adsorbed oxygen groups would change the band structure, which primarily narrowed the bandgap energy or broadened the valence band edge, increased the number of electron-trapping sites from the shallow to midgap levels, and enhanced the upward band-bending at the surface. The PAA-induced change in the band structure enhanced the decomposition and bacterial inactivation because it facilitated the separation and concentration of photoexcited carriers. The findings provide a new perspective on enhancing the photocatalytic activities of rutile-based TiO2 nanoparticles under general lighting. AIP Publishing 2024-01-11 eng journal article VoR 404610 https://tokushima-u.repo.nii.ac.jp/records/2011624 https://doi.org/10.1116/6.0003101 10.1116/6.0003101 21662746 21662754 AA10804928 Journal of Vacuum Science & Technology B 42 1 012203 https://tokushima-u.repo.nii.ac.jp/record/2011624/files/jvstb_42_1_012203.pdf application/pdf 3.54 MB 2025-01-11