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Graphene gas sensor fabrication. (a) Schematic drawing of graphene synthesized by CVD. (b) Graphene coated with PMMA for transfer. (c) Removal of graphene from Cu foil. (d) Transferred to the Si substrate with 300 nm SiO2 with PMMA (e) PMMA removal with acetone. (f) Schematic drawing of graphene gas sensor.
