Electrical Transport and Magnetoconductivity in Doped Polypyrrole

  • M. D. Migahed
  • T. Fahmy
  • S. Roth


Polypyrrole doped with Toluene-p-sulfonate (PPy (TOS)) has been prepared electrochemically at different current densities. It was found that, electrical conductivity (a) has a great dependence on the current density i.e., (σ = 0.17 and 50 S/cm at j= 0.5 and 7.5 mA/cm2 respectively), conductivity has been fitted according to Mott’s equation in a wide range of temperature from 18 K to 200 K with a good agreement in 3D-system. In addition, it was observed that, polypyrrole samples have a strong positive magnetoresistance at very low temperatures and it has a quadratic behavior at small magnetic fields, up to H= 5T.


Localization Length Magnetic Field Increase Pyrrole Monomer Polypyrrole Film Free Standing Film 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. D. Migahed
    • 1
  • T. Fahmy
    • 1
  • S. Roth
    • 2
  1. 1.Polymer laboratory, Phys. Dept, Faculty of ScienceMansoura Uni.MansouraEgypt
  2. 2.Max-Planck Institute for FestkorperforschungStuttgartGermany

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