Abstract TiO2 thin films with different surface structure have been prepared from alkoxide solutions by the sol-gel method using different cationic precursors and heat treatment techniques. The effect of using titanium isopropoxide as well as titanium butoxide as a titanium source on the surface structure and photocatalytic activity of the resultant thin films was studied. Significant differences in the rate of hydrolysis and condensation reactions during the sol-gel synthesis were observed for these titanium precursors. This had a direct influence on the morphology of the as-prepared TiO2 films. Higher quality oxide coatings were obtained from titanium isopropoxide. They were characterized by a smaller grain size, improved surface roughness and uniform coverage of the glass substrate. A beneficial effect of calcination process after each sol application cycle in contrast to single step calcination after all dip-coating cycles was observed. Photocatalytic degradation tests showed that methyl orange was decolorized in the presence of all prepared TiO2 films by exposing their aqueous solutions to UV light (λ = 254 nm). The highest photocatalytic activity had the TiO2 layer produced using titanium isopropoxide.

中文翻译：

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钛源和溶胶-凝胶TiO2薄膜形成参数对其形貌和光催化活性的影响

摘要 使用不同的阳离子前驱体和热处理技术，通过溶胶-凝胶法从醇盐溶液中制备了具有不同表面结构的 TiO2 薄膜。研究了使用异丙醇钛和丁醇钛作为钛源对所得薄膜的表面结构和光催化活性的影响。对于这些钛前体，在溶胶-凝胶合成过程中观察到水解和缩合反应速率的显着差异。这对所制备的 TiO2 薄膜的形态有直接影响。从异丙醇钛获得更高质量的氧化物涂层。它们的特点是更小的晶粒尺寸、改善的表面粗糙度和玻璃基板的均匀覆盖。观察到与所有浸涂循环后的单步煅烧相比，在每个溶胶施加循环后煅烧过程的有益效果。光催化降解测试表明，在所有制备的 TiO2 薄膜存在的情况下，甲基橙通过将其水溶液暴露于紫外光（λ = 254 nm）而脱色。使用异丙醇钛生产的 TiO2 层具有最高的光催化活性。