Abstract
By using ab initio molecular dynamics calculations, we show that even where the graphene lattice constant contracts, as previously reported for freestanding graphene below room temperature, the average carbon-carbon distance increases with temperature, in both free and supported graphene. This results in a larger corrugation at higher temperature, which can affect the interaction between graphene and the supporting substrate. For a weakly interacting system as , we confirm the results using an experimental approach which gives direct access to interatomic distances.
- Received 30 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.135501
© 2011 American Physical Society