title: Effects of nanosized constriction on thermal transport properties of graphene.
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 10(7) to 10(9) 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.
  65.80.CK; 61.48.Gh; 63.20.kp; 31.15.xv.
authors.affiliation: Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, China ; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.
authors.forename: Wen-Jun
authors.initials: WJ
authors.lastname: Yao
authors.affiliation: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.
authors.forename: Bing-Yang
authors.initials: BY
authors.lastname: Cao
authors.affiliation: Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, China.
authors.forename: He-Ming
authors.initials: HM
authors.lastname: Yun
authors.affiliation: Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, China.
authors.forename: Bao-Ming
authors.initials: BM
authors.lastname: Chen
keywords: Ballistic resistance; Graphene; Molecular dynamics simulation; Nanosized constriction