TRANSPORT PROPERTY OF POLYANILINE AND ITS MOLECULAR-WEIGHT DEPENDENCE

The electrical conductivity of polyaniline doped with camphor sulfonic acid (PAn-CSA) was studied. The results indicate that there is a crit ical temperature (T-c) and the temperature dependence of PAn-CSA condu ctivity shows metallic and semiconductor characteristics above and bel ow T-c, respectively. The higher the molecular weight of PAn, the lowe r the T-c. The conductivity was enhanced remarkably when PAn-CSA film was stretched, its room temperature conductivity is up to 750 S/cm whe n elogonation is 60%; however, T-c was independent of elongation.