聚苯胺与聚乙烯醇的原位复合膜及电色性

In-situ Composite Films and Electrochromism of Polyaniline and Poly(vinyl alcohol)

采用恒电位原位聚合法制备了聚苯胺/聚乙烯醇复合膜(PVA-PAN).研究了单体浓度和掺杂酸的种类对复合膜性能的影响.通过循环伏安法、光谱电化学法等对复合膜的电学性能和光学性能进行了研究.与无基体的纯聚苯胺膜相比,复合膜与ITO(铟锡氧化玻璃)电极表面具有更好的粘结性能和均匀性、更好的电活性以及更快的响应.当施加电位在-0.50 V到-0.14 V之间时,复合膜呈现无色透明状态,当施加电位在+0.40^+0.90 V之间时,复合膜呈现紫色状态,可见光的吸收峰峰位产生明显的紫移.经过1 422次电位循环扫描之后,复合膜的循环伏安曲线中的峰电流强度以及可见光的吸光度分别能保持83%左右和60%左右,显示出适宜的循环寿命.

The composite films of polyaniline and poly（vinyl alcohol） （PVA-PAN） were electrochemic.ally synthesized in-situ via potentiostatic technique. The effects of aniline concentration and acid species on the electrical and optical properties of the composite films were studied by using cyclic voltammetric and in situ UV-vis spectroelectrochemical methods. It was found that the composite films stick more tightly on the ITO electrode and show more uniform appearance, stronger electroactivity and faster response than pure potyaniline film without PVA substrate. The PVA-PAN composite films show transparent colorless state at the potential range of - 0.50 V to - 0.14 V, and purple state at the potential range of ＋ 0.40 V to ＋ 0.90 V. The absorption peak in visible spectral range displays an obvious hypsochromic shift. After 1 422 switchings, the peak current in cyclic voltammogram and the absorbance of UV-Vis spectrum can retain nearly 83 % and 60 %, respectively, indicating that the composite films exhibit a reasonable cycle life.