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Issue 2, 2013
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Substrate coupling suppresses size dependence of thermal conductivity in supported graphene

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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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Publication details

The article was received on 27 Sep 2012, accepted on 26 Nov 2012 and first published on 27 Nov 2012


Article type: Communication
DOI: 10.1039/C2NR32949B
Citation: 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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