纳米TiO2/聚苯胺复合膜电极的电化学制备及其表征

采用1 mol/L硫酸作为介质， 扫描速度为100 mV/s， 扫描电位为-0.2~0.8 V， 用循环伏安法在纳米二氧化钛（Nano-TiO₂）膜电极上实现了苯胺的电化学聚合 ， 借助透射电镜、 原子力显微镜、 X射线衍射仪、 红外光谱对制得的Nano-TiO_{2/聚苯胺（Nano-TiO2/PANI）复合膜进行表征. 结果表明, 复合膜的生成、 峰电流的大小受溶液浓度、 扫描速度以及扫描电位的影响， 成膜速度随溶液浓度增大而加 快， 但膜稳定性降低， 峰电流随扫描速度和电位增大而提高， 可逆性降低， 复合膜中Ti O2以10~35 nm晶粒分散于聚苯胺中.}

Electrochemical Preparation and Characterization of Complex Film of Nanocrystalline TiO2/Polyaniline

The electrochemical polymerization of aniline on a nanocrystall ine titanium dioxide film e lectrode(Nano-TiO₂) has been achieved by means of cyclic voltammetry in a medium of 1 mol/L sulfuric acid and s canning voltage range of -0.2~0.8 V at a rate of 100 mV/s. The complex film was charactered by TEM, AFM, XRD and FTTR. The result shows that the formation of the complex film and the values of peak current are influenced by the concent rations of sulfuric acid and aniline, the scanning rate and the scanning voltag e on Nano-TiO₂. The higher the solution concentration is, the higher the rate of the membrane formation, whereas the stability of the membrane is decreased. The peak current increased with the elevating of scanning rate and p otential, but the reversibility decreased under the s ame condition. It also shows that the surface of TiO₂ nanoparticles of 10~35 nm in diameter is incompletely coated by polyaniline.