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Electrical properties of epoxy-based nanocomposites filled with graphene oxide

Graphene has become a popular subject, which has being studied by many researchers due to its satisfactory electrical, thermal and mechanical properties. It is more and more commonly used in nanocomposites to improve the material's overall performance. The hydrophilicity of graphene oxide has provided so much convenience in the production of epoxy-based nanocomposites samples. However, the properties of epoxy-based nanocomposites containing grahene oxide, especially the electrical properties, remain unclear. In this paper, a comprehensive experimental research has been carried out on epoxy-based nanocomposites. Firstly, samples containing 0.5wt% of graphene oxide are produced. Then the dielectric spectroscopy, with the frequency ranging from 10-1 to 106 Hz, temperature ranging from -30°C to 200°C has been performed on samples. From the experimental results, the dielectric properties of epoxy-based nanocomposites filled with graphene oxide could be obtained. The difference of relative permittivity and loss factor between epoxy resin and nanocomposites at different frequency and temperature are studied. Furthermore, the thermal conductivity of nanocomposites filled with graphene oxide is measured in order to see whether nano-fillers have improved the thermal conductivity of pure epoxy resin, which indeed, is one of the core issues remain unsolved nowadays.