Effect of High Pressure on the Conductivity of Polyaniline

For conducting polymer polyaniline (PANI) the degree of ordering, conductivity and hopping barrier changes greatly after oriented stretching. In this paper we have studied the effect of hydrcotatic high pressure on the electrical property of oriented and unoriented PANI films. We find that for unoriented PANI film, the conductivity is monotonously increased and hopping barrier T0 is monotonously decreased with the increase of pressure, on the other hand for oriented PANI film the conductivity shows a maximum at 0.47 GPa and T0 shows a minimum between 0.35~0.71 GPa. This anomalous behaviour is different from other conducting polymers, such as polyacetylene, polythiophine, etc.