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Current noise and conductivity in composites of conductive spherical polyaniline particles covered with non-conductive poly(vinyl alcohol) layers dispersed in the same polymer medium were investigated. As the polyaniline particles are fully separated by insulating material, conductive percolation is not possible and electrical conductivity occurs only by thermally assisted charge hopping or possibly tunnelling. An interpretation in terms of quiet conductive paths through the polyaniline particles and noisy conductance through the poly(vinyl alcohol) matrix is given.
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Quadrat et al. (1995) studied this question.
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