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Journal Article

Extraordinary epitaxial alignment of graphene islands on Au(111)


Walter,  Andrew L.
Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Wofford, J. M., Starodub, E., Walter, A. L., Nie, S., Bostwick, A., Bartelt, N. C., et al. (2012). Extraordinary epitaxial alignment of graphene islands on Au(111). New Journal of Physics, 14(5): 053008. doi:10.1088/1367-2630/14/5/053008.

Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-EBA2-8
Pristine, single-crystalline graphene displays a unique collection of remarkable electronic properties that arise from its two-dimensional, honeycomb structure. Using in situ low-energy electron microscopy, we show that when deposited on the (111) surface of Au carbon forms such a structure. The resulting monolayer, epitaxial film is formed by the coalescence of dendritic graphene islands that nucleate at a high density. Over 95% of these islands can be identically aligned with respect to each other and to the Au substrate. Remarkably, the dominant island orientation is not the better lattice-matched 30 degrees rotated orientation but instead one in which the graphene [01] and Au [011] in-plane directions are parallel. The epitaxial graphene film is only weakly coupled to the Au surface, which maintains its reconstruction under the slightly p-type doped graphene. The linear electronic dispersion characteristic of free-standing graphene is retained regardless of orientation. That a weakly interacting, non-lattice matched substrate is able to lock graphene into a particular orientation is surprising. This ability, however, makes Au(111) a promising substrate for the growth of single crystalline graphene films.