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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

MEASUREMENT OF THERMAL CONDUCTIVITY OF INDIVIDUAL CARBON NANOTUBE BY THE 4-POINT 3-ω METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC13.p8.200
7 pages

Résumé

The thermal conductivity of an individual multi-walled carbon nanotube was measured by utilizing the 4-point-probe 3-ω method, where the third harmonic amplitude and phase as a response to the applied alternate current at fundamental frequency, ω, are expressed in terms of thermal conductivity and diffusivity. To this end, a microfabricated device composed of four metal electrodes was modified to make nanometer-sized wires by using a focused ion beam source. In this way, a carbon nanotube could be suspended over a deep trench milled by the focused ion beam, preventing heat loss to the substrate. As compared to the previous study by the 2-point-probe technique, a much more accurate measurement was enabled by using four probes, which eliminate the effect of contact resistance, making it possible to measure the correct signals of 1st and 3rd harmonics. To place single carbon nanotube across the designated metal electrodes, we utilized the principle of dielectrophoresis with combination of dc and ac electric field. The multi-walled carbon nanotube was modeled as a one-dimensional diffusive energy transporter and its thermal conductivity was measured at room temperature under vacuum at 300±20 W/mK.