Charge transport study of chemically synthesized polypyrroles soluble in organic solvents

J. Joo, Y. C. Chung, J. K. Lee, J. K. Hong, W. P. Lee, S. M. Long, A. J. Epstein, H. S. Woo, K. S. Jang, E. J. Oh

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We report the results of temperature (T) dependence of dc conductivity (σdc), microwave dielectric constant, and EPR experiment for soluble polypyrrole (PPY) samples with different dopants (DBSA and NSA) prepared using various organic solvents (NMP, m-cresol, CHCl3, and DMSO). The three dimensional variable range hopping (VRH) model provides the best fit to the data, while the slope of σdc(T) varies with dopants and solvents used. σdc at room temperature is ∼ 0.2 - 0.01 S/cm and the localization length is estimated as ≤ 15 Å, which indicates the relatively strong localization of charge for these materials. We discuss the relation between the polarity of solvent and σdc(T). From EPR experiment, the density of states of the systems is estimated.

Original languageEnglish
Pages (from-to)831-832
Number of pages2
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 1997 Jan

Bibliographical note

Funding Information:
This work was supported in part by Basic Science Research Grant (BSRI-96-2444) of the Ministry of Education, Korea and Korea Science and Engineer Foundation (KOSEF), and NSF-DMR-9508723.


  • Conductivity
  • Hall effect
  • Polypyrrole and derivatives
  • Solution processing
  • Transport measurements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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