Structure and Photocatalytic Activities of Ag/TiO2 Thin Films

Abstract

Abstract: Nanometric TiO₂ thin films doped with Ag were prepared by the sol-gel method. The effects of Ag on the structure of TiO₂ films were systematically studied
by means of X-ray diffraction, BET nitrogen adsorption, UV-VIS-NIR transmission spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic activity
of Ag/TiO₂ thin films was characterized and studied in photocatalytic degradation of methylene blue under UV irradiation in comparison with pure TiO₂ thin films.
The results showed that suitable amount of Ag effectively improved photocatalytic activity of TiO₂ thin films. The mechanism could be ascribed to that: (1) The
electron-hole pair separation efficiency of TiO₂ films was improved by the introduction of Ag. The concentration of photoholes at the surface of TiO₂
films increased; (2) TiO₂ particle sizes decreased while Ag was introduced, which further widened the band-gap of TiO₂ and improved its photocatalytic
redox capability; (3) The absorption of -OH and H₂O on TiO₂ films was increased, which improved the photoholes transfer efficiency and the concentration of reactive --OH group on TiO₂ thin films after UV irradiation.

Key words: Ag/TiO₂ thin films, sol-gel, structure, photocatalytic activity

CLC Number:

O484

HE Chao,YU Yun,ZHOU Cai-Hua,HU Xing-Fang. Structure and Photocatalytic Activities of Ag/TiO₂ Thin Films[J]. Journal of Inorganic Materials.

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Structure and Photocatalytic Activities of Ag/TiO₂ Thin Films

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