PEDOT:PSS导电自支撑薄膜的合成与表征

Synthesis and characterization of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) free-standing conductive film

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证,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,在氧化剂过硫酸铵与单体EDOT物质的量比为0.875时达到最佳电导率(19.19 S/cm)。自支撑薄膜厚度约18μm,在25℃,40%~60%相对湿度范围内拉伸强度达到45~60MPa,具有良好的导电性与机械性能。

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS) suspension was prepared by chemical oxidation synthesis in water system using 3,4-ethylenedioxythiophene(EDOT) as monomer, poly(sodium-p-styrenesulfonate)(PSS-Na) 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 conductivity test, SEM and tensile strength test, respectively. The results showed that PEDOT:PSS was successfully prepared. The prepared film achieved an optimal conductivity of 19.19 S/cm when the mole ratio of oxidant(NH4)2 S2 O8 to EDOT monomer was 0.875. The thickness of the free-standing film was about 18 μm. The tensile strength of the free-standing film reached 45~60 MPa at 25 ℃ and in the range from 40% to 60% relative humidity. This indicated that the prepared PEDOT:PSS free-standing film possessed both good conductivity and mechanical properties.