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Open Access Nano Express

Effects of nanosized constriction on thermal transport properties of graphene

Wen-Jun Yao12, Bing-Yang Cao2*, He-Ming Yun1 and Bao-Ming Chen1

Author Affiliations

1 Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, China

2 Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

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Nanoscale Research Letters 2014, 9:408  doi:10.1186/1556-276X-9-408

Published: 21 August 2014

Abstract

Thermal transport properties of graphene with nanosized constrictions are investigated using nonequilibrium molecular dynamics simulations. The results show that the nanosized constrictions have a significant influence on the thermal transport properties of graphene. The thermal resistance of the nanosized constrictions is on the order of 107 to 109 K/W at 150 K, which reduces the thermal conductivity by 7.7% to 90.4%. It is also found that the constriction resistance is inversely proportional to the width of the constriction and independent of the heat current. Moreover, we developed an analytical model for the ballistic thermal resistance of the nanosized constrictions in two-dimensional nanosystems. The theoretical prediction agrees well with the simulation results in this paper, which suggests that the thermal transport across the nanosized constrictions in two-dimensional nanosystems is ballistic in nature.

PACS

65.80.CK; 61.48.Gh; 63.20.kp; 31.15.xv

Keywords:
Graphene; Ballistic resistance; Nanosized constriction; Molecular dynamics simulation