Conductivity of HBF/sub 4/-and HCLO/sub 4/-doped emeraldine polyaniline in air and ammonia

Summary form only given. For the emeraldine poiyaniline films doped with HBF/sub 4/ and HClOsub 4/ conductivity in air and ammonia vs both concentration of NH/sub 3/ molecules and temperature was measured at various values of thin film thickness. Polymer films were produced by precipitation from saturated polyaniline solution in dimethyiformamide onto substrates having a system of interdigital contacts. For both types of films the resistivity in the ammonia ambience was shown to grow (sub)linearly with NH/sub 3/ molecules concentration in the range from 100 to 1000 ppm. The conductivity G was exponential in temperature T: G=Goexp[(To/T)/spl and/k]. The values of parameters To and k were determined for cases of both air and ammonia. The obtained results enabled us to suggest the hole hopping to be the dominant mechanism of charge transport in these materials. Physical mechanisms of the effect of adsorbed molecules on charge transfer in polyanilines are discussed.