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ID 117581
Author
Mimoto, Yuki Tokushima University
Niibe, Masahito University of Hyogo
Nakano, Yoshitaka Chubu University
Mukai, Takashi Nichia Corporation
Keywords
titanium oxide nanoparticles
anatase/rutile-mixed phases
plasma-assisted annealing
ambient air annealing
ultraviolet irradiation
visible-light irradiation
photocatalytic activity enhancement
Content Type
Journal Article
Description
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.
Journal Title
Physica Status Solidi A: applications and materials science
ISSN
18626300
18626319
NCID
AA12238581
AA12810604
Publisher
Wiley-VCH
Volume
218
Issue
24
Start Page
2100536
Published Date
2021-10-07
Rights
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.
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DOI (Published Version)
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language
eng
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departments
Science and Technology
Bioscience and Bioindustry