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On tunneling effects in metal-deposited polyethylene-carbon black and polycarbonate-carbon black systems

Published online by Cambridge University Press:  31 January 2011

T.A. Ezquerra ,
Calleja F.J. Baltá  and
J. Plans
T.A. Ezquerra
Affiliation:
Institute de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain
Calleja F.J. Baltá
Affiliation:
Institute de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain
J. Plans
Affiliation:
Departamento de Fisica Fundamental, Universidad Autónoma de Madrid, Cantoblanco, Madrid, Spain
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Abstract

Electrical conductivity for polyethylene-carbon black, polycarbonate-carbon black composites was measured for conducting compositions well above the percolation limit. Three conductivity methods were employed in our studies: sputtering coated metal electrodes, painted metal electrodes, and the four-point method. Results suggest that while the two latter methods do not modify substantially the material surface, the former method introduces a low conductivity region at the surface. The effect of contact resistance developed during metal coating is discussed in the light of both fluctuation-induced tunneling predictions and “hopping” transport mechanisms. Experimental results favor the tunneling alternative across the evaporated metalcomposite interphase.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 3 , June 1986 , pp. 510 - 514
Copyright
Copyright © Materials Research Society 1986

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References

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