THE TEMPERATURE DEPENDENCE OF THE ELECTRICAL CONDUCTIVITY OF POLYPYRROLE FILMS DOPED WITH DIFFERENT COUNTERIONS

The temperature dependence of the electrical conductivity of the polypyrrole films doped with different counterions was investigated. The results show that the electrical conductivity is strongly dependent both on the nature of the doping ions and the preparation conditions of the samples. Measurements have been compared with predictions both of the fluctuation-induced tun- nelling model (Sheng) and the hopping model (Zuppiroli) applied to these disordered materials.