Composite thin films of polyaniline (PAN)/ZnO are synthesized via electropolymerization (ECP) process in acidic medium on ITO (working electrode) with platinum mesh as a counter electrode and Ag/AgCl as a reference electrode. Acidic medium helps in polymerization and enhances the crystallinity of PAN. PAN films that are obtained in the presence of sulfuric acid give partial crystallinity in its high conducting form, i.e., emeraldine salt. Inorganic metal oxide–organic polymer thin film was used to get a new type of composite nanostructures. The cyclic voltammetry and chronoamperometric properties were investigated by potentiostat for different doping percentages of ZnO with a constant Molar concentration of PAN. Current conduction properties are found to be increased in the presence of ZnO particles. Optical properties were investigated using UV–Vis and photoluminescence spectroscopy. Photoluminescence shows emission in the blue, green and yellow regions. Band gap variation has also been calculated with the help of Tauc’s plot which found to be decreasing with the increase of doping percentage of ZnO.

中文翻译：

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ZnO存在下聚苯胺的电化学性质和带隙变化

聚苯胺（PAN）/ ZnO复合薄膜是通过电聚合（ECP）工艺在酸性介质上以铂网为对电极，以Ag / AgCl为参比电极在ITO（工作电极）上合成的。酸性介质有助于聚合并提高PAN的结晶度。在硫酸存在下获得的PAN薄膜以高导电形式（即翡翠盐）产生部分结晶性。无机金属氧化物-有机聚合物薄膜用于获得新型的复合纳米结构。通过恒电位仪研究了在恒定摩尔摩尔浓度的PAN中不同掺杂百分比的ZnO的循环伏安法和计时电流法性质。发现在ZnO颗粒的存在下电流传导特性增加。使用紫外可见光谱和光致发光光谱研究了光学性质。光致发光显示在蓝色，绿色和黄色区域的发射。借助Tauc曲线还可以计算出带隙变化，该曲线随ZnO掺杂百分比的增加而减小。