Thermal Contact Resistance and Thermal Conductivity of a Carbon Nanofiber

Citation:

C. H. Yu, Saha, S. K., Zhou, J. H., Shi, L., Cassell, A. M., Cruden, B. A., Ngo, Q., and Li, J., “Thermal Contact Resistance and Thermal Conductivity of a Carbon Nanofiber,” Journal of Heat Transfer, vol. 128, no. 3, pp. 234–239, 2006.

Abstract:

We have measured the thermal resistance of a 152‐nm-diameter carbon nanofiber before and after a platinum layer was deposited on the contacts between the nanofiber and the measurement device. The contact resistance was reduced by the platinum coating for about 9–13% of the total thermal resistance of the nanofiber sample before the platinum coating. At a temperature of 300K, the axial thermal conductivity of the carbon nanofiber is about three times smaller than that of graphite fibers grown by pyrolysis of natural gas prior to high-temperature heat treatment, and increases with temperature in the temperature range between 150K and 310K. The phonon mean free path was found to be about 1.5nm and approximately temperature-independent. This feature and the absence of a peak in the thermal conductivity curve indicate that phonon-boundary and phonon-defect scattering dominate over phonon-phonon Umklapp scattering for the temperature range.

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