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oai:tokushima-u.repo.nii.ac.jp:02010384 2025-04-28T05:43:42Z 1713853213384:1713853295607

Photocatalytic Activity Enhancement of Anatase/Rutile-Mixed Phase TiO2 Nanoparticles Annealed with Low-Temperature O2 Plasma 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 ミモト, ユウキ ミモト, ユウキ Mimoto, 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 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 向井, 孝志 ムカイ, タカシ Mukai, Takashi open access This is the peer reviewed version of the following article: Kawakami, R., Mimoto, Y., Yanagiya, S., Shirai, A., Niibe, M., Nakano, Y. and Mukai, T. (2021), Photocatalytic Activity Enhancement of Anatase/Rutile-Mixed Phase TiO2 Nanoparticles Annealed with Low-Temperature O2 Plasma. Phys. Status Solidi A, 218: 2100536., which has been published in final form at https://doi.org/10.1002/pssa.202100536. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. titanium oxide nanoparticles anatase/rutile-mixed phases plasma-assisted annealing ambient air annealing ultraviolet irradiation visible-light irradiation photocatalytic activity enhancement Photodecomposition and photobactericidal activities of anatase/rutile-mixed phase TiO2 nanoparticles annealed with low-temperature O2 plasma were clarified by comparing them with those annealed in ambient air. The photocatalytic activities of plasma-assisted-annealed sample greatly enhanced as compared with the untreated sample, under not only ultraviolet irradiation but also visible-light irradiation. The photocatalytic activities of air-annealed samples did not enhance under ultraviolet irradiation but enhanced under visible-light irradiation. The enhanced photocatalytic activities due to the plasma-assisted annealing (PAA) originated from the increased photoexcited carrier concentration. This enhancement was discussed from PAA-induced characteristic factors. PAA facilitated the phase transformation to anatase, contributing directly to extending the photoexcited carrier lifetime. PAA introduced more oxygen vacancies, contributing to trapping more photogenerated electrons. PAA also introduced more bridging/terminal oxygen groups adsorbed on the surface, increasing the upward band-bending, the depletion layer width at the surface, and the charge transfer from rutile to anatase. These two introductions contributed to facilitating the separation of photoexcited carriers. Furthermore, PAA reduced the aggregate size of TiO2 nanoparticles formed on the surface, contributing to increasing optical absorptions. More reactive oxygen species produced from the bridging/terminal oxygen groups by the photoexcited carriers would also enhance the photocatalytic activities. Wiley-VCH 2021-10-07 eng journal article AM 383587 https://tokushima-u.repo.nii.ac.jp/records/2010384 https://doi.org/10.1002/pssa.202100536 10.1002/pssa.202100536 18626300 18626319 AA12238581 AA12810604 Physica Status Solidi A: applications and materials science 218 24 2100536 https://tokushima-u.repo.nii.ac.jp/record/2010384/files/pssa_218_24_2100536.pdf application/pdf 4.35 MB 2022-10-23