Abstract
Aromatic molecules can effectively exfoliate graphite into graphene monolayers, and the resulting graphene monolayers sandwiched by the aromatic molecules exhibit a pronounced Raman -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 -band splitting by removing the energy degeneracy of in-plane longitudinal and transverse optical phonons at the point.
- Received 14 October 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.135501
©2009 American Physical Society