Graphene has outstanding characteristics for electroconductivity, thermal conductivity and mechanical strength. It is possible that nanocomposites synthesized by combining graphene with Pt nanoparticles have unique characteristics (e.g. improving of catalytic activity). In this study, we have synthesized nanocomposites composed of graphene (or graphene oxide) and Pt nanoparticles under ultrasonic and gamma-ray irradiation fields. It is considered that Pt ions and graphene oxide are reduced simultaneously by reductive radicals formed from water and organic additives under irradiation fields.
