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Comparative study of electrical properties of polyaniline films and polyaniline-polystyrene blends

Published online by Cambridge University Press:  15 April 1999

V. Jousseaume ,
A. Bonnet ,
M. Morsli  and
L. Cattin
V. Jousseaume
Affiliation:
Université de Nantes, Groupe des Matériaux pour l'Électronique, EPSE, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
A. Bonnet
Affiliation:
Université de Nantes, Groupe des Matériaux pour l'Électronique, EPSE, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
M. Morsli*
Affiliation:
Université de Nantes, Groupe des Matériaux pour l'Électronique, EPSE, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
L. Cattin
Affiliation:
Université de Nantes, Groupe des Matériaux pour l'Électronique, EPSE, 2 rue de la Houssinière, B.P. 92208, 44322 Nantes Cedex 03, France
*
[email protected]
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Abstract

In this paper, a simple model classically used to describe electrical behavior in conducting polymers can take into account transport properties in polyaniline dopedwith two different counter-ions and in polyaniline-polystyrene blends. Conduction isMaynly limited by hopping or tunneling between polaronic conducting clusters. When thestructural disorder is less pronounced, a metallic contribution can occur near roomtemperature in series with the hopping/tunneling one. This heterogeneous picture usedfor unblended polyaniline can be applied to explain electrical blend properties abovethe percolation threshold when conduction occurs among completely connectedpolyaniline paths. Below the percolation threshold, the model has to take into accountan additional contribution due to a hopping mechanism between large disconnectedsegments of polyaniline. It is shown that thermoelectric power reflects essentiallythe metallic behavior of the conducting clusters.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 6 , Issue 1 , April 1999 , pp. 7 - 12
Copyright
© EDP Sciences, 1999

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