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Journal Article

Extraordinary epitaxial alignment of graphene islands on Au(111)

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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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1367-2630_14_5_053008.pdf
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Citation

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
Abstract
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.