Low-stress transfer of graphene and its tunable resistance by remote plasma treatments in hydrogen

In this chapter, a novel, low-stress process for transferring thermal chemical vapor deposition (CVD) single-layer graphene from copper foils to destination substrates is demonstrated. An efficient transfer of graphene by directly fishing up the graphene with the target substrate rather than by using the “poly(methyl methacrylate) (PMMA)-based transfer” method is reported. Electrical and optical characteristics of the as-transferred graphene and the hydrogen remote-plasma-modified graphene are presented. Although graphene is mechanically very strong considering its atomically thin structure, a large-area, single-layer graphene is practically very fragile, especially during handling and transfer from one substrate to another. Handling of a large-area freestanding graphene is even more challenging. The combination of effective transfer and surface treatment of graphene by hydrogenation allows the fine-tuning of its electrical resistivity for practical applications.