TiO2纳米微粒对聚苯胺性能的影响

纳米微粒具有量子尺寸效应, 其光、电、声及磁等方面的性能与常规材料有显著的不同, 其中以TiO2纳米微粒的电荷载体、光电活性中心、光学微腔和光电特性等特征[1,2]尤为引人注目. 导电聚合物的纳米复合材料是纳米材料的研究热点之一, 在导电材料、电流体和高密度信息存储材料等方面具有良好的应用前景[3]. 在导电聚合物中, 聚苯胺(PANI)因其具有较高的电导率, 原料便宜, 稳定性好而成为目前最有希望获得实际应用的导电聚合物[4～6]. 将纳米微粒和PANI制成复合材料, 其光电性能等与PANI相比均有所改变. 目前已相继有PANI-ZrO2, PANI-MnO2, PANI-SiO2纳米复合材料的报道[7,8], 而有关PANI-TiO2研究工作尚少见报道. 本文制备了PANI-TiO2纳米复合材料, 通过红外光谱、紫外可见光谱及透射电镜等探讨了复合材料的微结构及性能.

Effect of TiO2 Nanoparticles on the Properties of PANI

Polyaniline/TiO₂ nanocomposites was prepared in the presence of titanium dioxide. The incorporation of polymers in the composites was proved by FTIRstudies. The nanocomposites have been characterized by four point probe conductivity measurements, UV-Vis, transmission electron micrograph. The results show that polyaniline/TiO₂ has a higher conductivity(×10^-2) compared with that of EB, the UV-Vis spectra properties of polyaniline/TiO₂ depend on the ratio of TiO₂ to polyaniline. The UV-Vis spectrum of the nanocomposites doped with HCSAshows a red shift and possesses a higher conductivity and better solubility compared with those of nanocomposites and PANI. TEMmicrographies show that TiO₂ nanoparticles are partly coated with the polymer.