Synthesis of TiO₂/Pt/TiO₂ multilayer films via radio frequency magnetron sputtering and their enhanced photocatalytic activity

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• 作者：Chao Ma^a ; Wen Dong^a ; ^b ; ^{dongwen@suda.edu.cn} ; Liang Fang^a ; Fengang Zheng^a ; Mingrong Shen^a ; ^{mrshen@suda.edu.cn} ; Zhenlin Wang^b
• 关键词：Structural properties ; Photocatalytic properties ; Sputtering
• 刊名：Thin Solid Films
• 出版年：2012
• 出版时间：30 June, 2012
• 年：2012
• 卷：520
• 期：17
• 页码：5727-5732
• 全文大小：805 K

文摘

TiO₂/Pt/TiO₂ (TPT) multilayered films with different thicknesses of Pt layers from about 0.75 to 12 nm were prepared by radio frequency magnetron sputtering method. The as-prepared films were characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy, UV-visible diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalytic activity of the samples was evaluated by the photocatalytic decolorization of methyl blue aqueous solution under ultraviolet light irradiation. The photocatalytic activities of all TPT multilayer films were higher than that of the pure TiO₂ films. When Pt thickness was increased to 3 nm, the measured photocatalytic activity of the TPT film was highest, and exceeded that of the pure TiO₂ films by a factor of more than three times. Such enhancement was ascribed to the presence of Pt layer, which inhibits the recombination of the photogenerated charge and carriers, as well as modifies the crystallinity of the TiO₂ top layer.