Correlation between thermal conductivity and bond length alternation in carbon nanotubes: A combined reverse nonequilibrium molecular dynamics—Crystal orbital analysis
Correlation between thermal conductivity and bond length alternation in carbon nanotubes: A combined reverse nonequilibrium molecular dynamics—Crystal orbital analysis
复制标题
碳纳米管热导率与键长交替之间的相关性:组合反向非平衡分子动力学-晶体轨道分析
DOI:
10.1002/jcc.21605
复制
发表时间:
2011
影响因子:
3
通讯作者:
M. C. Böhm
中科院分区:
文献类型:
--
作者:
M. Alaghemandi;J. Schulte;F. Leroy;F. Müller-Plathe;M. C. Böhm
The thermal conductivity (λ) of carbon nanotubes (CNTs) with chirality indices (5,0), (10,0), (5,5), and (10,10) has been studied by reverse nonequilibrium molecular dynamics (RNEMD) simulations as a function of different bond length alternation patterns (Δri). The Δridependence of the bond force constant (krx) in the molecular dynamics force field has been modeled with the help of an electronic band structure approach. These calculations show that the Δridependence ofkrxin tubes with not too small a diameter can be mapped by a simple linear bond length–bond order correlation. A bond length alternation with an overall reduction in the length of the nanotube causes an enhancement of λ, whereas an alternation scheme leading to an elongation of the tube is coupled to a decrease of the thermal conductivity. This effect is more pronounced in carbon nanotubes with larger diameters. The formation of a polyene‐like structure in the direction of the longitudinal axis has a negligible influence on λ. A comparative analysis of the RNEMD and crystal orbital results indicates that Δri‐dependent modifications of λ and the electrical conductivity are uncorrelated. This behavior is in‐line with a heat transfer that is not carried by electrons. Modifications of λ as a function of the bond alternation in the (10,10) nanotube are explained with the help of power spectra, which provide access to the density of vibrational states. We have suggested longitudinal low‐energy modes in the spectra that might be responsible for the Δridependence of λ. © 2010 Wiley Periodicals, Inc. J Comput Chem, 2010
登录
查看更多内容
DOI:
10.1103/physrevb.48.4329
发表时间:
1993
期刊:
Physical review. B, Condensed matter
影响因子:
--
作者:
Smontara;Biljakovic;Artemenko
通讯作者:
Artemenko
DOI:
10.1007/b95265
发表时间:
2013-10
期刊:
--
影响因子:
--
作者:
M. Karttunen;I. Vattulainen;A. Lukkarinen
通讯作者:
M. Karttunen;I. Vattulainen;A. Lukkarinen
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
A. Smontara;A. Bilušić;E. Tutis̆;H. Berger;F. Lévy
通讯作者:
F. Lévy
DOI:
--
发表时间:
1983
期刊:
影响因子:
--
作者:
M. Böhm
通讯作者:
M. Böhm
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
M. Böhm
通讯作者:
M. Böhm