Fig. 1: Surface morphology of monolayer graphene on various substrates.
From: Anomalous optical response of graphene on hexagonal boron nitride substrates
a Schematic illustration and b ×50 optical image of graphene on SiO2/Si substrate. Dashed lines are a guide to eye-emphasizing flake boundaries. Inset demonstrates obtained Raman spectrum taken from the point specified by the black dot in (b). c Atomic force microscopy (AFM) color map taken from the region specified by the red cross in (b). The color bar shows the surface roughness. Inset shows histograms of the height distribution (surface roughness) for the substrate (SiO2/Si) and the flake (graphene). d Schematic illustration and e ×50 optical image of graphene on hBN/glass substrate. Dashed lines are a guide to eye-emphasizing flake boundaries. Inset demonstrates obtained Raman spectrum taken from the point specified by white dot in (e). f AFM color map taken from the region specified by the red cross in (e). The color bar shows the surface roughness. Inset shows histograms of the height distribution (surface roughness) for the substrate (hBN/glass) and the flake (graphene).
