ELECTRICAL-CONDUCTIVITY OF POLYANILINE AS A FUNCTION OF PRESSURE USING A DIAMOND-ANVIL CELL

We report our results on the electrical resistance of thin films of po lyaniline as a function of pressure which was applied to the samples u sing a diamond anvil cell up to 22 GPa at room temperature. Samples of polyaniline cast from N-methylpyrrolidinone (NMP) and doped with HCl and also those doped with camphor sulfonic acid (CSA) and cast from m- cresol were studied. Resistance versus pressure measurements recorded during the loading and unloading cycle show asymmetry, suggesting irre versible structural changes. Since the primary effect of applying pres sure is sample compression, this leads to reduced interchain separatio n resulting in enhanced interchain charge transport. Such effects are reflected in reduced resistance with increasing pressure as depicted i n our results.