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Fabrication of thermally-conductive carbon nanotubes-copper oxide heterostructures

Published online by Cambridge University Press:  29 May 2013

Yuan Li  and
Nitin Chopra
Yuan Li
Affiliation:
Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35401 U.S.A.
Nitin Chopra*
Affiliation:
Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35401 U.S.A.
*
*Corresponding Author E mail: nchopra@eng.ua.edu, Tel: 205-348-4153, Fax: 205-348-2164
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Abstract

A complete dry processing route is developed for the fabrication of thermally-conductive carbon nanotube (CNT)-copper oxide (CuOx) heterostructures. This was achieved by the deposition of copper (Cu) onto CNTs and subsequent annealing in Ar and air environment to convert the coated Cu into CuOx nanoparticles. The survivability and diameters of CNTs were studied to ensure their integrity after the multiple processing steps and annealing temperatures (400 °C). The as-produced CNTs, air/Ar-annealed CNTs, Cu-coated CNTs, and CNT-CuOx heterostructures were characterized to study their structure, phase, and morphology using microscopy, elemental analysis, X-ray diffraction, and sheet resistance. It was observed that CNTs could survive the processing conditions and became coated with CuOx nanoparticles. The sheet resistance of CNTs coated with CuOx nanoparticles was ∼4 times greater than the as-produced CNTs. The Raman spectroscopy-based estimation of thermal conductivity of CNTs and CNT-CuOx heterostructures showed 2-7 times enhancement for the latter as compared to pure CuOx. In conclusion, such hybrid CNT-based heterostructures are promising for applications in thermal management.

Keywords

thermal conductivityoxideannealing
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1543: Symposium V – Nanoscale Thermoelectric Materials, Transport Phenomena, and Applications to Solid-State Cooling and Power Generation , 2013 , pp. 119 - 124
Copyright
Copyright © Materials Research Society 2013 

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