Synthesis, characterization and optical properties of graphene sheets-ZnO multipod nanocomposites

In this paper, attention is focused on the synthesis of graphene sheets-ZnO (GSs-ZnO) multipod nanocomposite. Graphene-based composites are emerging as a new class of materials that hold promise for many curious applications in different areas. In this section, we report a suitable approach for the formation of GSs-ZnO composites through two-step processes. Initially, graphene nanosheets are synthesized by solvothermal method and in the second-stage GSs-ZnO composite is synthesized by hydrothermal method using water as solvent. It was observed that ZnO multipods were randomly dispersed on the surfaces of graphene sheets (GSs). We have also carried out the structural and optical characterizations of GSs-ZnO nanocomposites. The hybridized structure of ZnO and graphene nanosheets has been further investigated by HRTEM. The 2-D graphene nanosheets and ZnO multipod are clearly observed in the TEM microstructures indicating the formation of nanocomposite structure. Raman and FTIR investigations of GSs-ZnO nanocomposite have also shown the signature of nanocomposite formation. In addition, a photoluminescence spectrum of GSs-ZnO multipod nanocomposites displays the fluorescence quenching property. (C) 2012 Elsevier B. V. All rights reserved.