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采用溶胶-凝胶法在不同基体表面制备了叠层式TiO2/SnO2复合纳米薄膜。用扫描电子显微镜(SEM)、X射线衍射(XRD)对复合薄膜表面形貌和晶体结构进行表征。采用紫外-可见吸收光谱法和电化学方法来研究复合薄膜光学与光电化学性能特征。结果表明,所制备的叠层式TiO2/SnO2复合纳米薄膜表面连续、均匀、致密;XRD分析表明纳米TiO2为锐钛矿型结构,SnO2为金红石型结构;紫外-可见吸收光谱测试表明叠层式TiO2/SnO2复合纳米薄膜较纯TiO2薄膜的吸收范围拓宽;稳定电位随时间变化曲线(OCP-t)结果表明,叠层式TiO2/SnO2复合纳米薄膜光照下其光电化学性能高于纯TiO2薄膜;同时,光照后叠层式TiO2/SnO2复合纳米薄膜能有效储存TiO2光生电荷,延续对不锈钢基体的光生阴极保护性能。经比较,叠加3层SnO2的TiO2/3SnO2复合纳米薄膜改善光电性能最佳。
Layered TiO2 / SnO2 nanocomposite films were prepared on different substrates by sol-gel method. The surface morphology and crystal structure of the composite films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Ultraviolet-visible absorption spectroscopy and electrochemical methods were used to study the optical and optoelectrochemical properties of the composite films. The results showed that the surface of the laminated TiO2 / SnO2 composite nanofilm was continuous, uniform and compact. The XRD results showed that the TiO2 was anatase and the SnO2 was rutile. The UV-Vis absorption spectra showed that the composite The results of OCP-t showed that the photoelectrochemical properties of TiO2 / SnO2 nanocomposite films were higher than those of pure TiO2 films under light irradiation. At the same time, TiO2 / SnO2 composite nanofilm can effectively store TiO2 photogenerated charge and extend the photocathode protection of stainless steel substrate. By comparison, the TiO2 / 3SnO2 composite nano-film with three layers of SnO2 superposed has the best photoelectric properties.