Abstract
In this paper, nano-graphene oxide (GO) particles are applied to modify the epoxy resin, and the surface charge characteristics of the prepared composites under various temperatures are investigated. Based on the surface potential decay behaviors, trap energy level distribution of the neat epoxy resin and graphene oxide/epoxy resin composite is calculated. Obtained results show that the introduction of GO increases the shallower trap density as well as decreases the deeper trap density at the same temperature. With the increase of temperature, the deep trap density is decreased while the shallow trap density is enhanced. The introduction of graphene oxide results in the increase of shallower trap density, and which makes the temperature coefficient of conductivity of epoxy/graphene oxide nanocomposite is reduced.
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