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Nano Lett. 2011 Sep 14;11(9):3663-8. doi: 10.1021/nl201590f. Epub 2011 Aug 16.

Direct imaging of graphene edges: atomic structure and electronic scattering.

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Department of Physics, Purdue University, West Lafayette, Indiana 47907, United States.


We report an atomically resolved scanning tunneling microscopy investigation of the edges of graphene grains synthesized on Cu foils by chemical vapor deposition. 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° 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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