Ultraviolet Light-Induced Surface Changes of Tungsten Oxide in Air: Combined Scanning Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy Analysis

Yuki Nakagawa; Yasuhiro Shiratsuchi; Tamaki Shibayama; Masaki Takeguchi

doi:10.3390/nano14181486

論文 Ultraviolet Light-Induced Surface Changes of Tungsten Oxide in Air: Combined Scanning Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy Analysis

Yuki Nakagawa (Fuclty of Engineering, Hokkaido University / 北海道大学　工学研究院) ; Yasuhiro Shiratsuchi (Hokkaido University) ; Tamaki Shibayama (Fuclty of Engineering, Hokkaido University / 北海道大学　工学研究院) ; Masaki Takeguchi (Research Center for Energy and Environmental Materials (GREEN)/Battery and Cell Materials Field/Environment-Controlled Microscopy Group, National Institute for Materials Science)

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Yuki Nakagawa, Yasuhiro Shiratsuchi, Tamaki Shibayama, Masaki Takeguchi. Ultraviolet Light-Induced Surface Changes of Tungsten Oxide in Air: Combined Scanning Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy Analysis. Nanomaterials. 2024, 14 (18), 1486. https://doi.org/10.3390/nano14181486

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(abstract)

STEM and XPS analyses were combined to clarify the ultraviolet light-induced surface changes of WO3 in air. IL-STEM analysis showed that the WO3 particle surface was covered with an amorphous thin film after ultraviolet irradiation in air. XPS analysis showed that hydrocarbon decomposition and formation of carboxyl/hydroxyl species occurred. These results suggested that the amorphous thin films would consist of photocatalytic oxidative species of hydrocarbon. IL-STEM analysis could detect small light-induced changes. This technique will be useful for microscopic characterization of photocatalysis or photoinduced hydrophilic conversion.

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