淀粉膜基底AgNW/聚乙撑二氧噻吩柔性透明导电膜的成型导电机理及构造特性

Forming Conductive Mechanism and Structural Characteristics of AgNW/Polyethylenedioxythiophene Flexible Transparent Conductive Film on Starch Film

在银纳米线(AgNW)溶液中引入5%聚乙撑二氧噻吩-聚(苯乙烯磺酸盐)(PEDOT:PSS)溶液,以淀粉膜为基底制备AgNW/PEDOT柔性透明导电膜。研究了导电膜的分子构造特性及导电机理,并对其透光率、粗糙度、柔韧性及应用稳定性进行了对比分析;探究了产品性能变化的规律和趋势。相比于AgNW导电膜,AgNW/PEDOT导电膜通过导电聚合物链和金属纳米线之间的电荷载流子传输,有助于电子通过跳跃机制进行电荷传输,杂化膜的电导率提高;PEDOT∶PSS溶液的存在使AgNW对光的散射作用减弱而透光率略微降低,同时在AgNW网格表面形成一层光滑均匀的PEDOT∶PSS膜,粗糙度显著减小;将导电膜反复弯曲折叠,由于PEDOT∶PSS的固定作用方阻变化幅度从5%降低到2%,柔韧性增强;比较导电膜在空气中环境稳定性,暴露在空气中的AgNW易氧化使AgNW膜方阻增大而AgNW/PEDOT导电膜由于PEDOT∶PSS的封装作用方阻增加幅度低于5%,稳定性明显提高。

5%polyethylenedioxythiophene-poly(styrene sulfonate)(PEDOT∶PSS)solution was introduced into AgNW solution to prepare AgNW/PEDOT composite flexible transparent conductive film based on starch film.The molecular structure characteristics and conductive mechanism of the composite film were studied.The transmittance,roughness,flexibility and application stability of the film material were compared and analyzed,and the rules and trends of product performance change were explored.Compared with AgNW conductive film,the AgNW/PEDOT conductive film is conductive to charge transfer through the charge carrier transfer between the conductive polymer chains and metal nanowire,which helps electrons to carry out charge transfer through the jump mechanism,and the conductivity of the hybrid film is improved.The existence of PEDOT∶PSS solution weakens the scattering effect of AgNW on light and slightly reduces the light transmittance.At the same time,a smooth and uniform PEDOT∶PSS film was formed on the surface of AgNW grid,and the roughness is significantly reduced.The conductive film is repeatedly bent and folded,and due to the fixing effect of PEDOT∶PSS,the variation range of square resistance is reduced from 5%to 2%,thus the flexibility is enhanced;as for the environmental stability of the product in air,AgNW exposed to the air is easy to oxidize,so that the square resistance of the AgNW film is increased,while the square resistance of the AgNW/PEDOT conductive film is increased by less than 5%due to the encapsulation effect of PEDOT∶PSS,so that the stability is obviously improved.