Electronic conductivity of pyrrole and aniline thin films polymerized by plasma

J. Morales*, M. G. Olayo, G. J. Cruz, M. M. Castillo-Ortega, R. Olayo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


In this article, we present a study of the influence of temperature and humidity on the electric conductivity of polyaniline and polypyrrole thin films doped with iodine and synthesized by plasma (PAn/I and PPy/I, respectively). The polymers presented the characteristic ohmic conduction mechanism via electrons; however, the conductivity was much lower than that presented by the polymers obtained by traditional chemical oxidation. We submitted the polymers to heating-cooling cycles to study the temperature dependence of the conductivity. During the heating stage of the cycles, the electric conductivity of PPy/I showed a strong dependence on the humidity content. However, during the cooling step, the plots of conductivity, as a function of the inverse temperature of PPy/I and PAn/I, showed typical Arrhenius behavior. The activation energy of PPy/I had an average value of 1.1 ± 0.1 eV and was independent of the reaction time, whereas PAn/I presented a more complex behavior with activation energies that depended on the reaction time and the regional crystallinity induced in the heating step of the cycles. All the activation energies were below 2 eV, which places them in the semiconductor regime.

Original languageEnglish
Pages (from-to)3247-3255
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number24
StatePublished - 15 Dec 2000


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