通过共溶剂的方法制备了石墨烯/炭纤维(CF)/聚偏氟乙烯(PVDF)导电复合材料。实验结果表明，氧化石墨烯(GO)在体积比 1∶9 的水(H2O)/二甲基甲酰胺(DMF)混合溶剂中能够形成稳定的均一溶液。采用扫描电子显微镜（SEM）分析热压还原后氧化石墨烯（RGO）/PVDF复合材料内部结构变化，采用透射电子显微镜（TEM）观察了石墨烯与炭纤维的相互作用。研究发现，CF的氧化处理更有利于提高复合材料的电导率，提升了近3个量级。CF的氧化处理与石墨烯复合产生了明显的正温度系数效应（PTC），消除了负温度系数效应（NTC）。最终通过SEM观察等分析了出现上述差异和现象的原因。
Graphene/carbon fiber(CF)/poly(vinylidene fluoride) (PVDF) conductive composite materials were prepared by co-solvent method. GO was stably dispersed in H2O/ N,N-dimethylformamide (DMF) (1∶9, volume ratio) component solvent. After sonication, a clear stable brown solution was prepared without any visible aggregation. Changes in the internal structure of the graphene/PVDF composites was demonstrated by scanning electron microscopy (SEM).The interaction between the graphene and carbon fiber was observed transmission electron microscope (TEM). It is found that oxidized carbon fiber (CF) is helpful to significantly improve the conductivity of graphene /PVDF composites by 3 orders of magnitude than that of the graphene /PVDF composites. Oxidized CF/graphene/PVDF composites show a positive temperature coefficient (PTC) behavior. The negative temperature coefficient (NTC) effect was eliminated after mixing of oxidized CF and graphene. The reasons of the above differences and phenomena were analyzed by SEM.
胡洪亮, 张国, 陈英, 杨泽川, 闫宇境.石墨烯/炭纤维/聚偏氟乙烯导电复合材料的电性能[J].高分子材料科学与工程,2013,29(11):58-61.复制