Fig. 4: Electronic structure characterization of Cu with graphene coating.
From: Enhanced copper anticorrosion from Janus-doped bilayer graphene
a Calculated charge density difference of monolayer and bilayer graphene on Cu. The positive (negative) value indicates the charge density increasing (decreasing). In this figure, orange, green, and blue balls represent the Cu atom, C atom in the monolayer or top layer graphene, and C atom in the bottom layer graphene, respectively. b KPFM image of monolayer and bilayer graphene-coated Cu. c Histogram of the surface potential in b, showing an ~135 mV difference in the contact potential between monolayer and bilayer graphene on Cu. d Calculated band dispersion of monolayer graphene on Cu. e, f Calculated band dispersions of the bottom layer e and the top layer f of 27.5° twisted bilayer graphene on Cu. g Experimental band dispersion of monolayer graphene on Cu. h, i Experimental band dispersions of the bottom layer h and the top layer i of 27.5° twisted bilayer graphene on Cu.
