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Localization, Coulomb interactions, and electrical heating in single-wall carbon nanotubes/polymer composites

J. M. Benoit, B. Corraze, and O. Chauvet
Phys. Rev. B 65, 241405(R) – Published 7 June 2002
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Abstract

Low-field and high-field transport properties of carbon nanotubes/polymer composites are investigated for different tube fractions. Above the percolation threshold fc0.33%, transport is due to hopping of localized charge carriers with a localization length ξ1030nm. Coulomb interactions associated with a soft gap ΔCG2.5meV are present at low temperature close to fc. We argue that it originates from the Coulomb charging energy effect which is partly screened by adjacent bundles. The high-field conductivity is described within an electrical heating scheme. All the results suggest that using composites close to the percolation threshold may be a way to access intrinsic properties of the nanotubes by experiments at a macroscopic scale.

  • Received 13 March 2002

DOI:https://doi.org/10.1103/PhysRevB.65.241405

©2002 American Physical Society

Authors & Affiliations

J. M. Benoit*, B. Corraze, and O. Chauvet

  • Institut des Materiaux Jean Rouxel IMN/LPC,2 rue de la Houssiniere, 44322 Nantes, France

  • *Present address: MPI-FK, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
  • Corresponding author. Email address: chauvet@cnrs-imn.fr

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Vol. 65, Iss. 24 — 15 June 2002

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