ELECTROMAGNETIC PROPERTIES OF COBALT-REDUCED GRAPHENE OXIDE (CO-RGO)/EPOXY COMPOSITES

摘要

During the last half decade, graphene, one of the most promising materials at nanoscale, has stimulated extensive scientific interests all over the world. With the extraordinary properties, such as high electrical conductivity (7200S/m~2) [2], thermal conductivity (about 5000W/mk) [3], surface area (2630m~2/g) [4] and tensile strength (130GPa) [5], this single-layer carbon material is regarded as a significant substitute in fabrication of transistors, integrated circuits, solar cells, chemical sensors and others. Its exceptional properties make this two-dimensional carbon material a promising substitute for other carbon-based materials, such as carbon black, expanded graphite and carbon nanotube, as filler for polymer nanocomposites. And much attention has been paid to synthesize modified graphene or graphene based nanocomposites. As previous studies have proven, graphene can enhance electronic and electromagnetic properties of polymer matrix composites more effectively than other carbon fillers [6]. In our recent work, we synthesized nanocomposites of cobalt nanoparticles decorated on reduced graphene oxide (Co-RGO), endowing graphene with soft magnetism. And we studied electromagnetic properties of polymer matrix composites filled with Co-RGO. Interestingly, complex permeability and complex permittivity of graphene based composites vary in different way as a function of cobalt nanoparticles on graphene sheets.