Chemical Physics Letters
research.physics.berkeley.edu › zettl › pdfSasaki et al. / Chemical Physics Letters 650 (2016) 107–112 109 Figure layers. 3. Typical SEM images of single-layer graphene (the dark area) grown on Cu foil annealed in pure H2 gas. Insert images are zoomed images of the two (white boxed) regions separated about 2mm. The graphene edges of two images are per-pendicular