Extended Data Fig. 6: Inhomogeneous strain in ICP post-treated graphene, comparison of graphene on different Cu substrates and D2-assisted flattening or growth. | Nature

Extended Data Fig. 6: Inhomogeneous strain in ICP post-treated graphene, comparison of graphene on different Cu substrates and D2-assisted flattening or growth.

From: Proton-assisted growth of ultra-flat graphene films

Extended Data Fig. 6

a, Typical Raman spectra of wrinkled graphene film after ICP treatment at 650 °C. b, Inhomogeneous distribution of ω2D collected from 2 mm × 2 mm region, showing that the strains are inhomogeneous on a large scale. c, Typical AFM image of Cu foil fully covered by graphene films. Scale bar, 1 μm. d, Typical Raman spectra of graphene films grown on different Cu substrates or suspended on a micro-sized hole. e, Raman spectra of wrinkled graphene films on Cu(111) after different treatments and of ultra-flat graphene films grown by ICP–CVD. All the processes here use D2. f, Distribution of Raman frequency collected from multiple points after different treatments.

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