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Phys Rev Lett. 2009 Apr 3;102(13):135501. Epub 2009 Mar 31.

Symmetry breaking of graphene monolayers by molecular decoration.

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  • 1School of Materials Science and Engineering, Nanyang Technological University, Singapore.

Abstract

Aromatic molecules can effectively exfoliate graphite into graphene monolayers, and the resulting graphene monolayers sandwiched by the aromatic molecules exhibit a pronounced Raman G-band splitting, similar to that observed in single-walled carbon nanotubes. Raman measurements and calculations based on the force-constant model demonstrate that the absorbed aromatic molecules are responsible for the G-band splitting by removing the energy degeneracy of in-plane longitudinal and transverse optical phonons at the Gamma point.

PMID:
19392367
[PubMed]
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