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. Crown Copyright (C) 2011 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.