(华南农业大学 理学院，广州 510642)
摘 要: 通过溶胶−凝胶法、浸渍−提拉法在玻璃片表面制备一系列掺杂铒的TiO2薄膜(Er-TiO2)。并利用XRD、SEM、DRS、FS等技术对掺铒TiO2薄膜进行表征，通过甲基橙溶液的光催化降解评价其光催化性能。结果表明：所制光催化剂为锐钛矿型；铒掺杂使TiO2薄膜的吸收光向长波方向移动。适量铒掺杂能够提高TiO2薄膜的FS光谱强度，这可能是因为铒掺杂能够使表面氧空位和缺陷的浓度增加；FS光谱强度越高，薄膜的光催化活性越高。当掺杂浓度为1.0%，镀膜层数为4层，煅烧温度为500℃时，Er-TiO2薄膜的光催化活性最高。
关键字: TiO2薄膜；铒掺杂；溶胶−凝胶法；光催化；
TiO2 films on glass surface
（College of Science, South China Agricultural University, Guangzhou 510642, China）
Abstract:A series of erbium-doped TiO2(Er-TiO2) films coated on glass surface were prepared with sol-gel and dip-coating method, and also were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS) and fluorescence spectrum (FS). The photocatalytic activity of the thin films was evaluated by photocatalytic degradation of methyl orange under UV irradiation. The results show that the crystalline phase of erbium doping photocatalysts is only anatase. Er-TiO2 thin films exhibit a shift of the UV-Vis absorption towards longer wavelengths. Er doping can improve the intensity of fluorescence spectra with an appropriate content, which is attributed to increasing the content of surface oxygen vacancies and defects. The higher the FS intensity, the higher the photocatalytic activity. The photocatalytic degradation results show that when the optimum molar fraction of Er is 1.0%, the number of optimal coatings layers is 4, and the optimal heat-treatment temperature for the Er-doped TiO2 film is 500 ℃.
Key words: TiO2 film; erbium doping; sol-gel method; photocatalytic
