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Thermal conductivity of carbon nanotube cable type composite

Tang Jing-Jing Feng Yan-Hui Li Wei Cui Liu Zhang Xin-Xin

Thermal conductivity of carbon nanotube cable type composite

Tang Jing-Jing, Feng Yan-Hui, Li Wei, Cui Liu, Zhang Xin-Xin
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  • Abstract views:  847
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  • Received Date:  05 July 2013
  • Accepted Date:  07 August 2013
  • Published Online:  20 November 2013

Thermal conductivity of carbon nanotube cable type composite

  • 1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;
  • 2. Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 50876010, 51176011), the National Basic Research Program of China (Grant No. 2012CB720404), and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant Nos. FRF-AS-12-002, FRF-TP-11-001B).

Abstract: For single-wall carbon nanotubes filled with gold nanowires, a kind of carbon nanotube cable type composite material, its thermal conductivity is simulated by non-equilibrium molecular dynamics method. The Tersoff potential is employed for C-C bonding interactions, the Lennard-Jones potential for C-Au interactions and the embedded atom method potential for Au-Au interactions. It turns out that the electronic thermal conductivity (ETC) of gold nanowire is much lower than that of the composite with the same size, so the ETC of metal nanowire could be ignored. The carbon atoms tend to vibrate along the axial direction of the tube because of the interaction between gold and carbon atoms. Furthermore, the umklapp scatterings among phonons are reduced and the phonon mean free path is increased. Therefore, the thermal conductivity of the composite is 20%45% higher than the bare carbon nanotubes in a temperature range of 100500 K, but the growth rate decreases with the rise of temperature. The thermal conductivity of the composite rises with the increasing of length but in a sharper rate, and decreases with the increasing of diameter in the same rate, which is similar to the bare carbon nanotubes.

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