Figure 9.

The edges of self-folded graphene nanostructure. (a) Topographies of graphene before and after the AFM-induced self-folding; (b) cross-sectional profile along the red line in (a); (c) LFM image of the folded graphene; (d) LFM image taken from the squared area in (c); (e) atomic-scale image collected from the white square in (d); (f) filtered FFT image of (e); (g) inverse FFT image of (e); (h) topography of the folded graphene. The white-solid (yellow-solid) line corresponds to the edge folded along the armchair (zigzag) direction. The white-dotted line is the edge torn along the armchair direction during mechanical ex-foliation. The white hexagons in (e,g) are for visual guidance.