Impedance studies of mixed ionic-electronic conjugated polymers

ORAL

Abstract

A polymer fabricated by sandwiching an ionically functionalized polyacetylene between two metal electrodes, is investigated with impedance analysis at temperatures ranging from 308K to 398K. Three processes-namely geometric capacitance charging, ion hopping and interfacial polarization-can be identified in the frequency region of 0.01 Hz to 1MHz. The temperature dependence of the conductivity and the hopping frequencies shows Arrhenius behavior with activation energies of 0.97 eV and 0.98 eV respectively. The similarity of these activation energies implies that the concentration of mobile charge carriers is independent of temperature and the conductivity is determined primarily by the charge carrier mobility. Ionic conductivity is found in the range 10$^{-12}$ to 10$^{-10}$ S/cm in the temperature span studied. These experiments lay the foundation for further investigations of charge transport at conjugated polymer interfaces with ionic functionality.

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Authors

  • Yongjun Wang

    Department of Chemistry, The Materials Science and Institute, Oregon Nanoscience and Microtechnologies Institute, University of Oregon

  • Galina Malovichko

    Physics and Astronomy, Brigham Young University, ADVR, HP Laboratories, University of Idaho, Montana State University, BYU, University of Washington, Department of Chemistry, The Materials Science and Institute, Oregon Nanoscience and Microtechnologies Institute, University of Oregon, University of Idaho, Dept. of Physics, Moscow ID

  • Galina Malovichko

    Physics and Astronomy, Brigham Young University, ADVR, HP Laboratories, University of Idaho, Montana State University, BYU, University of Washington, Department of Chemistry, The Materials Science and Institute, Oregon Nanoscience and Microtechnologies Institute, University of Oregon, University of Idaho, Dept. of Physics, Moscow ID