有机导电高分子复合锐钛矿薄膜研究  

Research on complex film of organic conductive polymer and anatase TiO_2

作　　者：高基伟[1] 申乾宏[1] 杨辉[2] 

机构地区：[1]浙江大学材料系,浙江杭州310027 [2]浙江大学绿色建材及应用技术工程研究中心

出　　处：《功能材料》2007年第12期2018-2020,共3页Journal of Functional Materials

基　　金：国家科技支撑计划资助项目(2006BAJ05B05);浙江省科技计划资助项目(2005C24005)

摘　　要：以溶胶-凝胶工艺,采用"钛酸丁酯-水-无水乙醇-盐酸"摩尔比为1∶175∶7.5∶0.1的体系制备出含有锐钛矿晶体的氧化钛溶胶,并选用有机导电高分子(聚乙撑二氧噻吩-聚苯乙烯磺酸盐)在低温下(100℃)制备出复合光催化薄膜。利用X射线吸收精细结构(XAFS)、透射电镜、荧光光谱对溶胶和薄膜进行分析,并考察了薄膜的光催化性能。研究表明,溶胶中锐钛矿晶体呈边长约200nm的正方形,具有与锐钛矿型氧化钛粉体标样相似的Ti原子K边边前结构和比标样略小的Ti原子配位数和配位距离;在紫外光照下,有机导电高分子复合薄膜中氧化钛层产生的电子转移到有机导电高分子层,有效抑制了光生电子-空穴对的复合,其对罗丹明B的光催化降解率随有机导电高分子层的厚度增加而变大,浸涂6层有机导电高分子的复合薄膜对罗丹明B的降解率是浸涂2层的复合薄膜降解率的2倍。Anatase TiO2 sol was prepared in sol-gel method, using ＂Ti （OC4 H9 ） 4-H2 O-C2 H50H-HCl＂ reaction system with mol ratio of 1 ： 175 ： 7. 5 ： 0.1, and complex film was prepared at 100℃ using poly（3,4-ethylened- ioxythiophene）-poly（styrenesulfonic acid） known as organic conductive polymer by means of dip coating meth- od. Sols and films were characterized by X-ray absorption fine structure （XAFS）, transmission electron microscopy, and fluorescence emission spectrum, and the photocatalytic performance of the complex film on Rhoda- mine B was investigated. It was found that there are 200nm-width square-shape anatase crystals in the sol. The XAFS results show that the K-preedge peaks of Ti in the sol are similar to that of anatase powders, while the coordination number and of the coordination distance of Ti are a little smaller to that of anatase powders. The results also show that photon-generated electrons from TiO2 transfer into organic conductive layer under UV ilumination sequently, tive layer. polymer is in this complex film, and the recombination of photon-generated electron-hole pair is suppressed consequently, so the photocatalytic property of complex film is increased with the thickness of the organic conductive layer. The decomposition ratio on Rhodamine B for complex film containing 6 layers of organic conductive 2 times of that for complex film containing 2 layers of organic conductive polymer.

关 键 词：锐钛矿溶胶 X射线吸收精细结构 有机导电高分子 复合薄膜 光催化 

分 类 号：O484[理学—固体物理] O643[理学—物理]