Direct Imaging of Graphene Edges: Atomic Structure and Electronic Scattering

Details Direct Imaging of Graphene Edges: Atomic Structure and Electronic Scattering Direct Imaging of Graphene Edges: Atomic Structure and Electronic Scattering

2011-07-25

arxiv.org/abs/1107.5029v1

Nano Letters 11, 3663 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1021/nl201590f

We report an atomically-resolved scanning tunneling microscopy (STM) investigation of the edges of graphene grains synthesized on Cu foils by chemical vapor deposition (CVD). Most of the edges are macroscopically parallel to the zigzag directions of graphene lattice. These edges have microscopic roughness that is found to also follow zigzag directions at atomic scale, displaying many ~120 degree turns. A prominent standing wave pattern with periodicity ~3a/4 (a being the graphene lattice constant) is observed near a rare-occurring armchair-oriented edge. Observed features of this wave pattern are consistent with the electronic intervalley backscattering predicted to occur at armchair edges but not at zigzag edges.

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