Nano Archive

Electrical and thermal transport in metallic single-wall carbon nanotubes on insulating substrates

Pop, Eric and Mann, David A. and Goodson, Kenneth E. and Dai, Hongjie (2007) Electrical and thermal transport in metallic single-wall carbon nanotubes on insulating substrates. JOURNAL OF APPLIED PHYSICS, 101 (9).

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Official URL: http://link.aip.org/link/?JAPIAU/101/093710/1

Abstract

We analyze transport in metallic single-wall carbon nanotubes (SWCNTs) on insulating substrates over the bias range up to electrical breakdown in air. To account for Joule self-heating, a temperature-dependent Landauer model for electrical transport is coupled with the heat conduction equation along the nanotube. The electrical breakdown voltage of SWCNTs in air is found to scale linearly with their length, approximately as 5 V/mu m; we use this to deduce a thermal conductance between SWCNT and substrate g approximate to 0.17 +/- 0.03 W K-1 m(-1) per tube length, which appears limited by the SWCNT-substrate interface rather than the thermal properties of the substrate itself. We examine the phonon scattering mechanisms that limit electron transport, and find the strong temperature dependence of the optical phonon absorption rate to have a remarkable influence on the electrical resistance of micron-length nanotubes. Further analysis reveals that unlike in typical metals, electrons are responsible for less than 15% of the total thermal conductivity of metallic nanotubes around room temperature, and this contribution decreases at high bias or higher temperatures. For interconnect applications of metallic SWCNTs, significant self-heating may be avoided if power densities are limited below 5 mu W/mu m, or if the SWCNT-surrounding thermal interface is optimized. (c) 2007 American Institute of Physics.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:3215
Deposited By:Anuj Seth
Deposited On:14 Jan 2009 15:46
Last Modified:20 Jan 2009 16:06

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