Charge transport and spin dynamics of chemically synthesized polypyrrole soluble in organic solvents

J. Joo, J. K. Lee, J. K. Hong, J. S. Baeck, W. P. Lee, A. J. Epstein, K. S. Jang, J. S. Suh, E. J. Oh

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Abstract

The results of the temperature dependence of dc conductivity, microwave dielectric constant, X-ray diffraction, EPR, and NMR experiments are reported for chemically synthesized polypyrrole films soluble in organic solvents. The temperature dependence of dc conductivity of these systems follows the three-dimensional variable range hopping model. The slope of the temperature dependence of dc conductivity varies with dopants and solvents used. Room temperature dc conductivities are in the range of ∼0.2-0.01 S/cm, and the localization lengths are estimated as ≤10 Å, which indicates a relatively strong localization of charge. The results of microwave dielectric constant experiments support the strong localization behavior. The X-ray diffraction studies show that soluble polypyrroles are amorphous. From electron paramagnetic resonance experiments, the density of states of polypyrrole doped with naphtha lenesulfonic acid in m-cresol solvent is estimated as ∼0.107 states/(eV ring). We obtain the result that the system achieves a more highly conducting state as the polarity of the solvent used increases.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalMacromolecules
Volume31
Issue number2
DOIs
Publication statusPublished - 1998 Jan 27

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ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Joo, J., Lee, J. K., Hong, J. K., Baeck, J. S., Lee, W. P., Epstein, A. J., Jang, K. S., Suh, J. S., & Oh, E. J. (1998). Charge transport and spin dynamics of chemically synthesized polypyrrole soluble in organic solvents. Macromolecules, 31(2), 479-483. https://doi.org/10.1021/ma970508v