DIELECTRIC-CONSTANT AND AC CONDUCTIVITY IN POLYANILINE DERIVATIVES

We report our results on ac conductivity and dielectric constant measu rements at 10 kHz on polyaniline and derivatives of polyaniline having alkyl ring-substituents. A comparison with de conductivity is made to gain further insight into the conduction mechanism. The room temperat ure de and ac conductivities are similar; however, deviations at lower temperatures characteristic of conduction mechanisms typical of varia ble range hopping are observed. This deviation is larger for samples h aving greater disorder. Disorder also suppresses the temperature depen dence of the dielectric constant.