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Thermal Transport Properties of Multi-Walled Carbon Nanotube Arrays

[+] Author Affiliations
Huaqing Xie

Shanghai Second Polytechnic University, Shanghai, China

An Cai

Shanghai Institute of Ceramics, Shanghai, China

Xinwei Wang

University of Nebraska at Lincoln, Lincoln, NE

Paper No. MNC2007-21033, pp. 1-5; 5 pages
doi:10.1115/MNC2007-21033
From:
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME

abstract

A laser flash technique was applied to measure the thermal diffusivity along a multi-walled carbon nanotube (CNT) array in temperature range of −55∼200 °C. In the measurements, a nanosecond pulsed laser was used to realize noncontact heating and the temperature variations were recorded by an infrared detector. The experimental results show that the thermal diffusivity of the CNT array increases slightly with temperature in the −55∼70 °C temperature range and exhibits no obvious change in the −75∼200 °C temperature range. The CNT array has much larger thermal diffusivity than several known excellent thermal conductors, reaching about 4.6 cm2 s−1 at room temperature. The mean thermal conductivity (λ) of individual CNTs was further estimated from the thermal diffusivity, specific heat (Cp), and density (ρ) by using the correlation of λ = αρCp . The thermal conductivity of individual CNTs increases smoothly with the temperature increase, reaching about 750 Wm−1 K−1 at room temperature.

Copyright © 2007 by ASME

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