Issue 2, 2013
From the journal:

Nanoscale

Substrate coupling suppresses size dependence of thermal conductivity in supported graphene†

Jie Chen,*a   Gang Zhang*b  and  Baowen Li*ac  

* Corresponding authors

a Department of Physics, Centre for Computational Science and Engineering, Graphene Research Centre, National University of Singapore, Singapore 117542
E-mail: phychenj@nus.edu.sg

b Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, People's Republic of China
E-mail: zhanggang@pku.edu.cn

c NUS-Tongji Center for Phononics and Thermal Energy Science and School of Physical Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
E-mail: phylibw@nus.edu.sg

Abstract

Thermal conductivity κ of both suspended and supported graphene has been studied by using molecular dynamics simulations. An obvious length dependence is observed in κ of suspended single-layer graphene (SLG), while κ of supported SLG is insensitive to the length. The simulation result of room temperature κ of supported SLG is in good agreement with the experimental value. In contrast to the decrease in κ induced by inter-layer interaction in suspended few-layer graphene (FLG), κ of supported FLG is found to increase rapidly with the layer thickness, reaching about 90% of that of bulk graphite at six layers, and eventually saturates at the thickness of 13.4 nm. More interestingly, unlike the remarkable substrate dependent κ in SLG, the effect of substrate on thermal transport is much weaker in FLG. The underlying physics is investigated and presented.

Graphical abstract: Substrate coupling suppresses size dependence of thermal conductivity in supported graphene

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Article information

DOI
https://doi.org/10.1039/C2NR32949B
Article type
Communication
Submitted
27 Sep 2012
Accepted
26 Nov 2012
First published
27 Nov 2012

Nanoscale, 2013,5, 532-536

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Substrate coupling suppresses size dependence of thermal conductivity in supported graphene

J. Chen, G. Zhang and B. Li, Nanoscale, 2013, 5, 532 DOI: 10.1039/C2NR32949B

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