Journal
NANOTECHNOLOGY
Volume 20, Issue 11, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0957-4484/20/11/115704
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Funding
- Deutsche Forschungsgemeinschaft (DFG)
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The thermal conductivity of single-walled and multi-walled carbon nanotubes has been investigated as a function of the tube length L, temperature and chiral index using non-equilibrium molecular dynamics simulations. In the ballistic-diffusive regime the thermal conductivity follows alpha L-alpha law. The exponent a is insensitive to the diameter of the carbon nanotube; alpha approximate to 0.77 has been derived for short carbon nanotubes at room temperature. The temperature dependence of the thermal conductivity shows a peak before falling at higher temperatures (> 500 K). The phenomenon of thermal rectification in nanotubes has been investigated by gradually changing the atomic mass in the tube-axial direction as well as by loading extra masses on the terminal sites of the tube. A higher thermal conductivity occurs when heat flows from the low-mass to the high-mass region.
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