Reply to Harutyunyan: Continuous and uniform graphene film grown on liquid Cu surface

Abstract

We would like to thank Harutyunyan (1) for his interest in our work (2). One of the conclusions from our work is that the use of liquid Cu can eliminate the grain boundaries found in solid Cu and results in the production of continuous and uniform graphene film. Such a conclusion has been drawn from the following experimental results. First, well-dispersed hexagonal graphene flakes (HGFs) can finally be grown into a continuous and uniform graphene film on liquid Cu surface with longer growth time, and these features of graphene films have been confirmed by extensive scanning electron microscopy, optical microscopy, and Raman spectroscopy techniques. Second, compared with nonuniform graphene film (i.e., mixed single and multilayer) grown on solid Cu surface (3), liquid Cu surface results in much improved uniform monolayer-dominated graphene film. Therefore, we think, there exists no misleading conclusion.