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采用具有锐钛矿晶粒的TiO2溶胶,通过浸渍提拉的方法,在载玻片上低温制备了具有光催化活性的TiO2薄膜。为进一步提高薄膜的光催化活性,采用掺杂了聚苯乙烯磺酸盐的聚乙撑二氧噻吩作为TiO2薄膜的涂膜基底,采用SEM、PL光谱等测试方法考察了该有机半导体基底对TiO2薄膜性能的影响,并就TiO2薄膜厚度对两种基底上薄膜光催化活性的影响及其机理进行了讨论。结果表明:电子从有机半导体向TiO2的迁移使得光生电荷较好地分离,从而增加了表层TiO2的空穴浓度。同时发现合适的TiO2厚度能够有效地提高薄膜的光催化活性。
TiO2 film with anatase crystal was used to prepare TiO2 film with photocatalytic activity at low temperature on glass slide by dipping and pulling method. In order to further improve the photocatalytic activity of the films, polyethylenedioxythiophene doped with polystyrenesulfonate was used as the coating substrate for TiO2 thin films. The effects of the organic semiconductor substrate on the photocatalytic activity of TiO2 The effects of TiO2 film thickness on the photocatalytic activity of the two substrates and their mechanism were discussed. The results show that the migration of electrons from the organic semiconductor to the TiO2 makes the photo-generated charge to be better separated, thereby increasing the hole concentration of the surface TiO2. At the same time, it was found that the proper thickness of TiO2 can effectively improve the photocatalytic activity of the film.