Thermal conductivity of graphene flakes: Comparison with bulk graphite

Details Thermal conductivity of graphene flakes: Comparison with bulk graphite Thermal conductivity of graphene flakes: Comparison with bulk graphite

2009-04-03

arxiv.org/abs/0904.0607v1

Applied Physics Letters, 94, 203103 (2009)

Physics

Condensed Matter

Materials Science

9 pages; 2 figures

Scientific paper

The authors proposed a simple model for the lattice thermal conductivity of graphene in the framework of Klemens approximation. The Gruneisen parameters were introduced separately for the longitudinal and transverse phonon branches through averaging over phonon modes obtained from the first-principles. The calculations show that Umklapp-limited thermal conductivity of graphene grows with the increasing linear dimensions of graphene flakes and can exceed that of the basal planes of bulk graphite when the flake size is on the order of few micrometers. The obtained results are in agreement with experimental data and reflect the two-dimensional nature of phonon transport in graphene.

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