Structural and Optical Characterizations of VO 2 Film on Graphene/Sapphire Substrate by Post-annealing after Sputtering

is an attractive thermochromic material, in which its electrical and optical properties can be switched by the structural phase-transition about . Recently, graphene is also a rising material which is researched as a transparent electrode because of its superior electrical and optical characteristics. In this respect, we try to fabricate the hybridized films using and graphene on transparent sapphire substrate and then we investigate a structure and characterize an optical property for the samples as a function of temperature. According to the result of IR-transmittance analysis of films as a function of temperature, the graphene-supported sapphire substrates are better about 10% than the bare sapphire substrates. The mean phase transition temperatures are also decreased as the number of graphene-layers increased and the hysteresis of phase transitions are narrowed.