Optimization on the synthesis of large-area single-crystal graphene domains by chemical vapor deposition on copper foils

In this paper, a traditional chemical vapor deposition method for synthesis of single-crystal graphene domains on copper foils was optimized by modulating the growth parameters. This provided us a low-cost and high-yield method for large-area single-crystal graphene domain growth. By this way, single-crystal graphene domains larger than 10μm were synthesized with a gas flow of 1000sccm argon, 40sccm hydrogen and 1.5sccm low-concentration methane for 15min after 3h pre-annealing. The morphologies of as-synthesized samples were characterized by Raman spectrum, optical microscope and scanning electron microscope. The result showed that the 10μm graphene domains were monolayer single crystals.