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Electrical conductivity of polypyrrole films at a temperature range of 70 K to 350 K

journal contribution
posted on 1998-01-01, 00:00 authored by Akif KaynakAkif Kaynak
The de conductivity of electrochemically synthesized polypyrrole films doped from light to intermediate levels with p-toluene sulfonic acid was measured in the temperature range of 77 to 300 K, using a modified four-probe rig. Plots of dc conductivity vs. temperature were parameterized by fitting Mott's Variable Range Hopping conduction model. The localization length of localized electrons was assumed to be 3 Å, which is approximately equal to the length of a pyrrole monomer. Mott parameters of polypyrrole films doped with p-TS were evaluated at 300 and 10 K. Results were found to be consistent with Mott's requirement that αR ≫ 1. Microwave (10 GHz) conductivity measurements were carried out on the same set of polypyrrole samples at a temperature range of 90 to 473 K. Both microwave and dc conductivities were found to increase with temperature. The large values of microwave conductivity compared to dc conductivity over the temperature range tested suggests the existence of more charge hopping that does not contribute to the dc conductivity.

History

Journal

Materials research bulletin

Volume

33

Issue

1

Pagination

81 - 88

Publisher

Elsevier Science

Location

Amsterdam, The Netherlands

ISSN

0025-5408

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1998, Elsevier Science