PEDOT-PSS导电聚合物LB薄膜的制备和性能

Preparation and characteristics of PEDOT-PSS conducting polymeric LB films

研究了十八胺(ODA)及其与硬脂酸(SA)混合单分子膜在导电聚合物聚3,4-乙烯二氧噻吩/聚苯乙烯磺酸(PEDOT- PSS)胶体亚相上的成膜行为和复合LB膜在室温下的电学性能.结果表明:ODA-SA/PEDOT-PSS复合LB膜具有更好的成膜性能,表面粗糙度小且稳定可控,薄膜具有较好的有序结构;ODA-SA/PEDOT-PSS膜电导率高于ODA/PEDOT- PSS复合LB膜,其电导率呈各向异性,水平电导率(σ_‖)与垂直电导率(σ_⊥)之间相差3～4个数量级,Ⅰ-Ⅴ曲线呈指数关系,为典型的电子隧穿类型.

The film-processing ability of ODA and mixed ODA-SA monolayer on poly （3, 4- ethylenedioxythiophene）-poly（styrenesulfonate） （PEDOT-PSS） colloidal dispersion subphase and the conducting performance of the PEDOT-PSS LB films were investigated. It is shown that better film-processing ability of PEDOT-PSS can be achieved by spreading ODA-SA mixed monolayer on the PEDOT-PSS subphase. The surface of ODA-SA/PEDOT-PSS mixed LB films appears much finer, steady and easy to be controlled with a relatively better ordered structure. And the conductivity of the films is higher than that of ODA/PEDOT-PSS films and there observed anisotropy conductivity on both LB films： The gap between horizontal conductivity （σⅡ） and vertical conductivity （σ⊥） of the films is as high as 3 to 4 quantitatively. Exponential characteristics of Ⅰ-Ⅴcurves of above LB films were observed and it can be ascribed to typical electron tunneling in multilayer structures.