摘要
采用浸渍提拉法依次在普通载玻片上制备PEDT／PSS（聚乙撑二氧噻吩（PEDT）掺杂聚苯乙烯磺酸盐（PSS））薄膜层和TiO2薄膜层，从而获得TiO2-PEDT／PSS双层复合膜。考察了PEDT／PSS涂膜液的组成、PEDT／PSS薄膜层厚度以及Ti02薄膜层厚度对TiO2-PEDT／PSS复合膜光催化活性的影响。发现PEDT／PSS溶液与正硅酸乙酯（TEOS）水解产物的体积比为10：1～15：1时，PEDT／PSS涂膜液性能最优，PEDT／PSS薄膜层的最佳厚度为2μm，TiO2薄膜层的最佳厚度在200nm左右。此外，还对复合膜光催化活性提高的机制进行了探讨。结果表明，由于PEDT／PSS的最低空余轨道的电位低于Ti02的导带电位，紫外光照下，TiO2中产生的光生电子注入到PEDT／PSS层，有效抑制了电子．空穴对的复合，增加了复合膜表面空穴的浓度，因此复合膜光催化活性比单一TiO2薄膜高。
TiO2 dual-layer composite film was successively prepared on glass flakes by dip-coating using the mixed solution of poly 3,4-ethylene dioxy thiophene adulterating poly styrene sulfonate （i.e. PEDT/PSS）. The influence of the component of PEDT/PSS mixed solution, and the thicknesses and of PEDT/PSS layer and TiO2 layer on the photocatalytic activity of TiO2-PEDT/PSS composite film were investigated. It was found that the best combination property of PEDT/PSS mixed solution was obtained when the volume ratio of PEDT/PSS solution and the hydrolysates of tetraethyl orthosilicate （TEOS） was in the range of 10：1 to 15：1, and the optimal thicknesses of PEDT/PSS layer and TiO2 layer were about 2 μm and 200 nm, respectively. In addition, the mechanism of the photocatalytic activity enhancement of TiO2-PEDT/PSS composite film was also analyzed. The results show that the photogenerated electron injection into the PEDT/PSS increases the hole concentration of superficial TiO2 layer and thus the photocatalytic activity of composite film if comparing with the single TiO2 film.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期1530-1533,共4页
Rare Metal Materials and Engineering
基金
浙江省科技计划(2005C24005)
