We have measured the thermal resistance of a -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 , 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 and . The phonon mean free path was found to be about 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.
Issue Section:
Micro/Nanoscale Heat Transfer
Keywords:
platinum,
carbon fibres,
nanostructured materials,
thermal resistance,
contact resistance,
thermal conductivity,
nanocontacts,
phonon-defect interactions,
phonon-phonon interactions,
umklapp process,
contact resistance,
nanofiber,
thermal conductivity,
uncertainty analysis,
platinum coating,
nanoscale contact,
thermal constriction resistance,
phonon scattering
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.Copyright © 2006
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