Universal frequency-dependent ac conductivity of conducting polymer networks

Papathanassiou, A. N.; Sakellis, I.; Grammatikakis, J.

Universal frequency-dependent ac conductivity of conducting polymer networks

Authors

Papathanassiou, A. N.

Sakellis, I.

Grammatikakis, J.

Description

A model based on the aspect of the distribution of the length of conduction paths accessible for electric charge flow reproduces the universal power-law dispersive ac conductivity observed in polymer networks and, generally, in disordered matter. Power exponents larger than unity observed in some cases are physically acceptable within this model. A saturation high frequency region is also predicted, in agreement with experimental results. There does not exist a universal fractional power law (and is useless searching for a unique common critical exponent), but a qualitative universal behavior of the ac conductivity in disordered media.
8 pages plus 3 figures