Electrical Transport and Magnetoconductivity in Doped Polypyrrole
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.
KeywordsLocalization Length Magnetic Field Increase Pyrrole Monomer Polypyrrole Film Free Standing Film
Unable to display preview. Download preview PDF.
- 1.T. A. Skotheim, “Handbook of Conducting Polymers” (Marcel Dekker, N. Y 1986).Google Scholar
- 2.K. Kanazawa, A.F. Diaz, P.M. Grant, G.B. Street, G.P. Gardini and J.F. Kwak, “Polypyrrole: an Electrochemically Synthesized Conducting Organic Polymer”, Synth. Met., 1, 329 (1979/1980).Google Scholar
- 4.N.F. Mott and E.A. Davis, “Electronic Processes in Non-Cryst. Mater.” Clarendon, Oxford 1979.Google Scholar
- 8.M. Reghu, Y. Cao, D. Moses, and A.J. Heeger, “Counterion-induced processibility of polyaniline: Transport at the metal-insulator boundary”, Phys Rev. B47, 1758, 1993.Google Scholar
- 9.A.K. Meikap, A. Das, S. Chatterjee, M. Digar and S.N. Bhattachargya, “Electrical Transport in Doped Polypyrrole Films at low Temperature”, Phys. Rev. B47, 340 (1993).Google Scholar