Published November 25, 2005
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Ballistic Phonon Thermal Transport in Multiwalled Carbon Nanotubes
Chicago
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Abstract
We report electrical transport experiments, using the phenomenon of electrical breakdown to perform thermometry, that probe the thermal properties of individual multiwalled carbon nanotubes. Our results show that nanotubes can readily conduct heat by ballistic phonon propagation. We determine the thermal conductance quantum, the ultimate limit to thermal conductance for a single phonon channel, and find good agreement with theoretical calculations. Moreover, our results suggest a breakdown mechanism of thermally activated C-C bond breaking coupled with the electrical stress of carrying ~10^12 A/m^2. We also demonstrate a current-driven self-heating technique to improve the conductance of nanotube devices dramatically.
Additional Information
©2005 The American Physical Society (Received 6 July 2005; published 21 November 2005) We thank Ali Ghaffari for assistance with fabrication. This work was supported by the Office of Naval Research, and Arrowhead Research Corporation (M. B.). The work in Lausanne was supported by the Swiss NSF and its research pool Nanoscale Science (L. F.). C. N. L. acknowledges the support of DARPA/DMEA (H94003-05-2-0504).Files
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