Figure 1.

Schematics of the synthesis mechanism of chemical vapor deposition (CVD) graphene on Cu foil (a) and the roll-to-roll transfer process of graphene (b). Reproduced with permission from [42]. Copyright Wiley-VCH, 2016. Schematic of the preparation of graphene oxide and reduced graphene oxide by the reduction of graphene oxide (c). Reproduced with permission from [63]. Copyright Wiley-VCH, 2011.