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The experimental determination of the onset of electrical and thermal conductivity percolation thresholds in carbon nanotube-polymer composites

Published online by Cambridge University Press:  28 January 2011

Byung-wook Kim ,
Steven Pfeifer ,
Sung-Hoon Park  and
Prabhakar R. Bandaru
Byung-wook Kim
Affiliation:
Department of Electrical and Computer Engineering, University of California, San Diego, USA
Steven Pfeifer
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of California, San Diego, USA
Sung-Hoon Park
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of California, San Diego, USA
Prabhakar R. Bandaru
Affiliation:
Materials Science Program, Department of Mechanical Engineering, University of California, San Diego, USA
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Abstract

We show evidence of electrical and thermal conductivity percolation in polymer based carbon nanotube (CNT) composites, which follow power law variations with respect to the CNT concentrations in the matrix. The experimentally obtained percolation thresholds, i.e., ~ 0.074 vol % for single walled CNTs and ~ 2.0 vol % for multi-walled CNTs, were found to be aspect ratio dependent and in accordance with those determined theoretically from excluded volume percolation theory. A much greater enhancement, over 10 orders of magnitude, was obtained in the electrical conductivity at the percolation threshold, while a smaller increase of ~ 100 % was obtained in the thermal conductivity values. Such a difference is qualitatively explained on the basis of the respective conductivity contrast between the CNT filler and the polymer matrix.

Keywords

compositeelectrical propertiesthermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1312: Symposium HH/II/JJ – Polymer-Based Materials and Composites—Synthesis, Assembly and Applications , 2011 , mrsf10-1312-ii07-06
Copyright
Copyright © Materials Research Society 2011

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