Varistor effect in Ag–graphene/epoxy resin nanocomposites

Ag–graphene/epoxy nanocomposites were prepared by an in situ method using Ag–graphene nanocomposites as additives. The electrical properties of the Ag–graphene/epoxy nanocomposites were investigated by current–voltage (I–V) tests. The result showed that the nanocomposites with filler contents between 0.8 and 3.0 wt.% exhibited a varistor effect. This reversible electrical nonlinearity resulted from the defects in the GO-derived graphene structure and the presence of the Ag nanoparticles.