化学法制备石墨烯对环氧树脂导电性能的影响

Influence of Graphene Prepared by Chemical Method on Epoxy Resin Electric Conductivity

通过化学氧化热解膨胀还原法制备了石墨烯,并对石墨烯的化学结构及微观形貌进行表征.将自制的石墨烯以及商业级的碳纳米管、富勒烯、石墨分别作为纳米导电填料加入到环氧树脂中,考察不同碳纳米材料对环氧树脂导电性能的影响.结果表明:所制备的石墨烯是不同于氧化石墨烯和热解膨胀石墨薄层的单层或少数层的二维材料;当石墨烯体积分数为0.25%时,复合材料的电导率发生渗流突变,而当体积分数增大到0.50%时,其电导率为2.02×10-7 S·m-1,导电性能得到显著增强.

Graphene （RGO） was prepared successfully through chemical oxidation-pyrolysis- reduction method. The chemical structure and morphology of the graphene were characterized by means of FTIR, XRD, SEM, TEM and AFM, respectively. It was found that the obtained RGO was a two-dimensional material with monolayer or multilayer structure and a few numbers of oxygen-containing functional groups on the surface. As conductive nano-fillers, the as- prepared RGO and commercial CNTs, fullerene, graphite were introduced into epoxy resin （ER） matrix to prepare the composite materials. The influence of the above carbon nano- materials on the conductive property of ER was discussed. The results indicate that RGO is a superior conductive nano- filler to others, which can improve the electric conductivity of ER greatly. The RGO/ER composite exhibits an electric percolation threshold as RGO volume ration is 0.25 % ; and thevolume conductivity of RGO/ER composite can reach to 2.02 ×10^-7 S· m^-1 when the RGO volume ratio is 0.50%.