Abstract
The composition and temperature dependence of the ac-conductivity of films of conducting polymer blends has been studied in the frequency range : 10 Hz – 18 GHz. The frequency dependence of the complex permittivity dramatically changes from a dielectric to a conducting behavior for a weight fraction of conducting polymer corresponding to the percolation threshold p c determined by dc-conductivity measurements. The high frequency dispersion of the ac-conductivity, characteristic of disordered conductors is recovered. In addition, a “relaxation” process is observed at intermediate frequencies, which can be of rather high amplitude for weight fractions slightly above p c . The “fractal” nature of the conducting polymer net seems to be responsible for this behavior.
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