Figure 4
From: Single adatom dynamics at monatomic steps of free-standing few-layer reduced graphene
Energy diagram for single adatom diffusion at monatomic step edges.
(a), Na adatom at the armchair edges. (b), Na adatom at the zigzag edges. (c), S adatom at the armchair edges. (d), S adatom at the zigzag edges. The arrows indicate the moving direction of single adatom at step edges. The bottom layer graphene, top layer graphene, Na atom and S atom are indicated in pink, gray, purple and red, respectively. X axis shows the positions of adatom along the direction indicated by arrows in the insets.
