Figure 2: AFM and TEM results for bilayer GNRs.
From: Synthesis of quasi-free-standing bilayer graphene nanoribbons on SiC surfaces
(a) AFM phase contrast image taken from a sample containing 320 nm wide bilayer GNRs (growth at 1,500 °C for 15 min followed by air annealing). Scale bar, 1 μm. The inset shows a close-up view of a single GNR. Scale bar, 0.5 μm. (b) Height profile taken from the same area (yellow dashed line in (a)). (c) Phase contrast image taken from a single bilayer GNR (growth at 1,470 °C for 15 min followed by air annealing). Scale bar, 0.5 μm. (d) Phase contrast image of a step edge without a GNR. Scale bar, 0.5 μm. (e) Phase shift profiles taken from images (c) (red dashed line) and (d) (yellow dashed line). (f) Cross-sectional phase-contrast TEM image of a bilayer GNR that extends along the surface terrace (growth at 1,450 °C for 15 min followed by air annealing). Scale bar, 20 nm. (g) A close-up view of the same region revealing the existence of few-layer graphene at the step facet. Scale bar, 5 nm.
