Article

Electron tunneling in conductor-insulator composites with spherical fillers

LPM, Ecole Polytechnique Fédérale de Lausanne, Station 17, CH-1015 Lausanne, Switzerland
Journal of Applied Physics (impact factor: 2.17). 08/2009; DOI:10.1063/1.3159040 pp.016103 - 016103-3
Source: IEEE Xplore

ABSTRACT We report on our Monte Carlo calculations of the conductivity of monosized and conducting spherical particles dispersed in a homogeneous matrix, with interparticle transport mechanism given by electron tunneling. We show that our numerical results can be reproduced by a simple formula based on a critical path analysis and which gives also a practical way to estimate the characteristic tunneling length ξ in real composites. We find that ξ is about 1 nm for several low structure carbon black polymer composites, in agreement with the expected order of magnitude.

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Keywords

homogeneous matrix
 
interparticle transport mechanism
 
low structure carbon black polymer composites
 
monosized
 
simple formula