基于化学气相沉积石墨烯/PEDOT-PSS共混复合材料的导电薄膜

采用液相剥离技术制备基于化学气相沉积（CVD）石墨烯/聚乙撑二氧噻吩-聚苯乙烯磺酸（PEDOT-PSS）共混复合材料的导电薄膜。采用原子力显微镜和SEM表征石墨烯/PEDOT-PSS复合薄膜的微观结构；通过紫外吸收谱、X射线光电子能谱、FTIR等分析技术探索该共混复合薄膜的导电机制。结果表明：石墨烯/PEDOT-PSS导电薄膜具有优异的电学特性，其方阻约为8 Ω/□；表面分析表明，石墨烯与PEDOT主链中五元噻吩发生π-π共轭效应，由此引起两作用体之间电子云密度的变化，该变化增加了PEDOT主链的载流子离域化程度，有利于PEDOT导电性的提升，同时提高石墨烯的载流子浓度，使CVD石墨烯/PEDOT-PSS复合薄膜的导电能力增强。

Conductive film based on CVD graphene/PEDOT-PSS hybrid composites

The conducting film based on chemical vapor deposition (CVD)-graphene/poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) hybrid composites was prepared by using liquid-phase exfoliation method. The microstructure of the graphene/PEDOT-PSS hybrid composites was characterized by using atomic force microscope and SEM. The conduction mechanism of the as-fabricated graphene/PEDOT-PSS film was studied by using ultraviolet-visible absorption spectroscopy, X-ray photoelectronic spectroscopy and FTIR. The graphene/PEDOT-PSS film shows high electrical properties with a sheet resistance of approximate 8 Ω/□. The conjugation effect between graphene and thiophene in PEDOT main chain leads to a change of electron cloud density, which enhances the carrier delocalization of PEDOT main chain and results in the conductivity enhancement of the PEDOT. Furthermore, the conjugation effect leads to the increase of carrier density of graphene, which can enhance the conductivity of graphene/PEDOT-PSS composite.