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采用溶胶-凝胶法在石英基板上旋涂制备不同系列的TiO2薄膜样品(掺F浓度、保温时间、薄膜厚度、晶型),并用X射线衍射等分析测试手段对样品的结构等性能进行表征。通过对薄膜样品光降解亚甲蓝溶液的实验测定来表征样品的光催化性能,并测定其光电导值。研究结果发现光电导值越大的样品对应的光催化性能也越好,说明了光电导和光催化性能存在内在联系,为用物理法表征光催化提供了实验依据。经过分析得出,光催化性和光电导率同时存在最佳掺F浓度(2%)、最佳薄膜厚度(331.5 nm),晶粒尺寸越大越有利于光催化性和光电导率的提高,锐钛矿-金红石混晶优于单一的锐钛矿相。
Different series of TiO2 thin films (doped with F concentration, holding time, film thickness and crystal type) were prepared by spin-coating on quartz substrate by sol-gel method. The structure and other properties of the samples were characterized by X-ray diffraction . The photocatalytic performance of the sample was characterized by the experimental determination of photodegradation of methylene blue solution and the photoconductivity of the sample was measured. The results showed that the larger the photoconductivity value, the better the photocatalytic performance corresponding to the sample, indicating that there is an intrinsic relationship between the photoconductivity and the photocatalytic performance, which provides experimental evidence for the physical characterization of photocatalysis. The results show that the optimal doping concentration (2%) and optimal film thickness (331.5 nm) exist simultaneously with the photocatalytic activity and photoconductivity. The larger the grain size is, the better the photocatalytic activity and photoconductivity are. The ore-rutile mixed crystal is superior to a single anatase phase.