Fig. 2: Cu corrosion resistance of monolayer and bilayer graphene.

a Evolution of the oxidized ratio of monolayer (triangle) and bilayer (circle) graphene coated Cu when heated at 200 °C in air. b The oxidation limit (5% area of the Cu was oxidized) of monolayer and bilayer graphene coated Cu at different temperatures. c Arrhenius plot of the oxidation rates of monolayer (triangle) and bilayer (circle) graphene coated Cu. d Schematic illustration for the evolution of defects on monolayer and bilayer graphene coated Cu. e AFM images of defects on monolayer and bilayer graphene coated Cu after being oxidized at 250 °C for 6 h. The detailed oxidation process is shown in Supplementary Fig. 6. f Time-evolution height profiles of the defects. The recording area corresponds to the dashed lines in e. The oxidation time (0, 0.5, 1.5, 3.5, and 6 h) is distinguished by different lightness levels.