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

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2014年 / 75卷 / 01期

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

页码：123 / 129

页数：7

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