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Photo-induced super-hydrophilic property and photocatalysis on transparent Ti-containing mesoporous silica thin films |
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| Authors: | Hiromi Yamashita Shinichiro Nishio Iwao Katayama Norikazu Nishiyama Hidetoshi Fujii |
| Affiliation: | aDivision of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan bDivision of Chemical Engineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan cJoining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 565-0047, Japan |
| Abstract: | The transparent Ti-containing mesoporous silica thin films can be prepared on quartz plate using a spin-coating sol–gel method. The spectroscopic characterization has revealed that the Ti-containing mesoporous silica thin films contain isolated and tetrahedrally-coordinated titanium oxide moieties in the frameworks. Compared with the common mesoporous silica thin films, these Ti-containing mesoporous silica thin films have demonstrated a strong hydrophilic surface property even before UV-irradiation. After UV-light irradiation, the contact angle of water droplet on the Ti-containing mesoporous silica thin films became lower, indicating the appearance of the super-hydrophilic property. Under UV-light irradiation Ti-containing mesoporous silica thin films also exhibited highly selective activity for the photocatalytic oxidation of propylene. The isolated and tetrahedrally-coordinated titanium oxide moieties are responsible for these photo-induced surface reactions. |
| Keywords: | Mesoporous thin film Titanium oxide Super-hydrophilic property |
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