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Micro/Nanoscale Heat Transfer

Effects of Stone-Wales Defects on the Thermal Conductivity of Carbon Nanotubes

[+] Author and Article Information
Li Wei, Peng Jia, Zhang Xinxin

 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, Chinawdliwei@126.com

Feng Yanhui1

 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, Chinawdliwei@126.com

1

Corresponding author.

J. Heat Transfer 134(9), 092401 (Jul 02, 2012) (5 pages) doi:10.1115/1.4006386 History: Received October 12, 2010; Revised March 09, 2011; Published July 02, 2012; Online July 02, 2012

The thermal conductivity of carbon nanotubes with Stone-Wales (SW) defects was investigated using non-equilibrium molecular dynamics method. The defect effects were analyzed by the temperature profile and local thermal resistance of the nanotubes with one or more SW defects and further compared with perfect tubes. The influences of the defect concentration, the length, the chirality and the radius of tubes and the ambient temperature were studied. It was demonstrated that a sharp jump in the temperature profile occurred at defect position due to a higher local thermal resistance, thus dramatically reducing the thermal conductivity of the nanotube. As the number of SW defects increases, the thermal conductivity decreases. Relative to the chirality, the radius has greater effects on the thermal conductivity of tubes with SW defects. With the similar radius, the thermal conductivity of armchair nanotube is higher than that of zigzag one. The shorter nanotube is more sensitive to the defect than the longer one. Thermal conductivity of the nanotube increases with ambient temperature, reaches a peak, and then decreases with increasing temperature.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Stone-Wales defects

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Figure 2

Model of carbon nanotubes

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Figure 3

Axial temperature profile of CNTs (3,3) with different defect concentration (L = 17.46 nm, Ts  = 300 K)

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Figure 4

Local thermal resistance of CNTs (3,3) with different defect concentration (L = 17.46 nm, Ts  = 300 K)

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Figure 5

Thermal conductivity of CNTs (3,3) with different defect concentration (L = 17.46 nm)

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Figure 6

Thermal conductivity of CNTs (3,3) with different lengths

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Figure 7

Axial temperature profile of CNTs with different chirality (L = 17.46 nm, Ts  = 300 K)

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Figure 8

Relative local thermal resistance of CNTs with different chirality (L = 17.46 nm, Ts  = 300 K)

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Figure 9

Thermal conductivity of CNTs (3,3) under different ambient temperature

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