PEDOT:PSS导电自支撑薄膜的合成与制备

Synthesis of PEDOT:PSS and preparation of free-standing conductive film

摘要:

以3,4-乙烯二氧噻吩（EDOT）为原料，聚对苯乙烯磺酸钠（PSS-Na）为分散剂和掺杂剂，通过化学氧化合成法在水体系中聚合制备了聚(3,4-乙烯二氧噻吩):聚苯乙烯磺酸（PEDOT:PSS）悬浮液，通过真空抽滤的方法制备了PEDOT:PSS自支撑柔性导电薄膜。通过FTIR、UV-Vis对聚合产物结构进行了表征与确认，通过四探针电导率测试、SEM、拉伸断裂强度测试对PEDOT:PSS薄膜的导电性、微观形貌与力学性能进行了表征。结果表明，成功制备了PEDOT:PSS目标产物，在氧化剂与单体物质的量之比为0.875时达到最佳电导率（19.19 S/cm）。自支撑薄膜厚度约18 μm，在25 ℃，40%~60%相对湿度范围内拉伸断裂强度达到45~60 MPa，具有良好的导电性与机械性能。

Abstract:

Suspension of conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was prepared by chemical oxidation synthesis in water system using 3,4-ethylenedioxythiophene (EDOT) as monomer. Poly(sodium-p-styrenesulfonate) (PSS-Na) was used as dispersant and doping agent. PEDOT:PSS free-standing flexible conductive film was prepared by vacuum filtration. The structure of the polymerized product was characterized by FTIR and UV-Vis. The conductivity, morphology and mechanical properties of PEDOT:PSS film were characterized by four-probe resistance test, SEM and tensile strength test, respectively. The results showed that PEDOT:PSS was successfully polymerized and the optimal conductivity (19.19 S/cm) was achieved when the mole ratio of oxidant to monomer was 0.875. The thickness of free-standing film is approximately 18 μm. The tensile strength of free-standing film reached 45 to 60 MPa at 25 °C and 40% to 60% relative humidity. This indicates that the prepared PEDOT:PSS free-standing film possessed both good conductivity and mechanical properties.