Abstract
Low-field and high-field transport properties of carbon nanotubes/polymer composites are investigated for different tube fractions. Above the percolation threshold transport is due to hopping of localized charge carriers with a localization length Coulomb interactions associated with a soft gap are present at low temperature close to 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