Heat conduction in extended X-junctions of single-walled carbon nanotubes

被引:9
作者
Yang, Xueming [1 ]
Chen, Dongci [1 ]
Du, Yarong [1 ]
To, Albert C. [2 ]
机构
[1] North China Elect Power Univ, Dept Power Engn, Baoding 071003, Peoples R China
[2] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15260 USA
基金
中国国家自然科学基金;
关键词
Nanostructures; Thermal conductivity; Transport properties; Phonons; THERMAL-CONDUCTIVITY; MOLECULAR-DYNAMICS; 3-OMEGA METHOD; DEPENDENCE; LENGTH; TEMPERATURE; CHIRALITY;
D O I
10.1016/j.jpcs.2013.09.009
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Non-equilibrium molecular dynamics (NEMD) simulations are employed to investigate the longitudinal thermal conductivity of non-orthogonal extended X-junction (EX-junction) of single-walled carbon nanotubes (SWCNTs). Different from standard junctions of SWCNTs, two distinct jumps in the temperature profile around the EX-junction are observed, which are responsible for the larger temperature gradient and reduction in thermal conductivity when compared to standard X-junction. Quantum corrected results show that the longitudinal thermal resistance of the X-junction and EX-junction decreases monotonically with increasing temperature which makes the longitudinal thermal conductivity of the tube with junction less sensitive to temperature above 400 K comparing with the individual pristine tube. The origin of the significant decrease of thermal conductivity of EX-junction is discussed through phonon spectra analysis. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:123 / 129
页数:7
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