Fig. 1From: Design and adjustment of the graphene work function via size, modification, defects, and doping: a first-principle theory studyThe definition of the graphene’s size. The schematic structures of zigzag (a) and armchair (b) graphenes that illustrate the definition of the graphene’s size. A unit cell is set as a carbon ring in the green box. The yellow arrows represent the direction of width and lengthBack to article page