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Thermal Rectification Characteristics of Graphene Nanoribbons of Asymmetric Geometries

Published online by Cambridge University Press:  19 December 2016

T. Iwata  and
K. Shintani
T. Iwata
Affiliation:
Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
K. Shintani*
Affiliation:
Department of Mechanical Engineering and Intelligent Systems, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
*
*(Email: [email protected])
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Abstract

The rectification of heat in graphene nanoribbons (GNRs) of asymmetric geometries is investigated by means of nonequilibrium molecular dynamics (NEMD). Two kinds of geometries of GNRs are addressed; a trapezoidal or T-shaped step is inserted halfway through a GNR in its longitudinal direction. The thermal conductivities (TCs) of the GNRs in the two longitudinal directions, forward and backward, are calculated making their width and temperature change. It is revealed that the thermal rectification ratio (TRR) of T-shaped GNRs are larger than those of trapezoidal GNRs and that the characteristics of heat transport in such asymmetric GNRs can be understood by considering the local phonon density of states (DOSs).

Keywords

Cnanoscalethermal conductivity
Type
Articles
Information
MRS Advances , Volume 2 , Issue 1: Nanomaterials , 2017 , pp. 15 - 20
Copyright
Copyright © Materials Research Society 2016 

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References

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