本文采用溶胶-凝胶法不添加任何表面活性剂和胶体模板制备了大孔TiO2薄膜.首先,在TiO2前驱体溶液中引入可聚合的有机单体,利用浸渍提拉法制备TiO2胶体薄膜.然后将该薄膜在紫外光下照射一段时间.紫外光照诱发了单体聚合,导致薄膜中出现两相,一相是新生成的富聚合物相,另一相是富TiO2低聚物一残余的单体相.将光照后的薄膜在600℃热处理10分钟后,可以得到具有大孔结构的TiO2薄膜.采用SEM,AFM,XRD,TG-DTA等技术对样品进行了表征.结果表明,多孔薄膜的结构可以通过改变反应参数进行调控,单体浓度的变化可以影响到薄膜晶体结构,600℃的煅烧可以将体系中绝大部分的有机物除去.光催化降解亚甲基蓝溶液实验结果表明,制备的TiO2多孔薄膜表现出较好的光催化性能.
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