Charge transport of camphor sulfonic acid doped polyaniline and poly(o-toluidine) fibers

Summary form only given. We report the results of temperature (T) dependent dc conductivity (/spl sigma//sub dc/), thermopower (S), microwave dielectric constant (E/sub mw/ and EPR studies for camphor sulfonic acid doped polyaniline (PAN-CSA) and its methyl ring-substituted derivative poly(o-toluidine) (POT-CSA) fibers, and contrast them with HCI doped samples (PAN-HCI and POT-HCI). For POT-HCl fibe, /spl sigma//sub dc/(295K) ~ 0.02 S/cm and /spl sigma//sub dc/(T) x exp[-(T/sub o/(/T)/sup -1/2/] with T/sub o//spl cong/3.8 x 10/sup 4/ K, very similar POT-HCl powder./sup 1/ In contrast, for POT-CSA fiber, /spl sigma//sub dc/(295K) ~ 10 S/cm and /sol sigma//sub dc/(T) shows much weaker T dependence with an effective T/sub o/ //spl cong/ 350 K. POT-CSA fiber also shows much higher /spl epsi//sub mw/ (T) and dramatically different thermopower than POT-HCl with S = A + BT, where A < 0 and B > 0, indicating that POT-CSA fiber is much closer to localization-delocalization boundary than POT-HCl. The results for PAN-CSA fiber are very similar to those for PAN-CSA films/sup 2/ with the presence of some poorer conducting linkages. Supported in part by OSU Center for Materials Research and US ONR