Correlation between thermal conductivity and bond length alternation in carbon nanotubes: a combined reverse nonequilibrium molecular dynamics--crystal orbital analysis

Journal of Computational Chemistry
Mohammad AlaghemandiMichael C Böhm

Abstract

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 (Δr(i) ). The Δr(i) dependence of the bond force constant (k(rx) ) in the molecular dynamics force field has been modeled with the help of an electronic band structure approach. These calculations show that the Δr(i) dependence of k(rx) in 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 Δr(i) -dependent modifications of λ and the electrical conductivity are uncorrelated. This behavior is in-line with a heat transfer that is not ca...Continue Reading

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Citations

Dec 11, 2013·The Journal of Chemical Physics·Mohammad Reza Gharib-ZahediMohammad Alaghemandi
Dec 18, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Daxing XiongHong Zhao

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