采用溶胶-凝胶浸渍-提拉法,通过改变镀膜顺序和镀膜速率制备了TiO2/SiO2(ST)和SiO2/TiO2(TS)型的一系列SiO2改性TiO2双层薄膜.薄膜的形貌、光透性、光催化活性、亲水性等分别用场发射扫描电镜(FESEM)、分光光度计、光降解甲基橙等表征方法进行了分析.结果表明:SiO2膜层因其低反射指数,在ST型、TS型薄膜中均能起到防反光作用;对于TS型薄膜,其光催化活性与亲水性均随表层SiO2薄膜提拉速率的增加而降低,但ST型薄膜则相反,当表层TiO2膜提拉速率为6mm/min时,所得薄膜表现出最佳的光催化活性和亲水性,进而具备最佳的自清洁性能.
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