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Lattice thermal conductivity of graphene flakes: Comparison with bulk graphite

被引：468
作者：
Nika, D. L.
Ghosh, S.
Pokatilov, E. P.
Balandin, A. A. [1 ]
机构：
[1] Univ Calif Riverside, Dept Elect Engn, Nanodevice Lab, Riverside, CA 92521 USA
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 20期
关键词：
ab initio calculations; graphene; Gruneisen coefficient; phonons; thermal conductivity; TEMPERATURE; FILMS; LAYER;
D O I：
10.1063/1.3136860
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 a 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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页数：3
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