Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 34, Issue 11, Pages 1700-1711Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/34/11/323
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A study of the electrical conductivity of polypyrrole-polyoxyphenylene composites (PPy-POP and PPy-POP-MPcTS) prepared by in situ electropolymerization is presented, where MPcTS stands for tetrasulfonated tetrasodium metallophthalocyanine salts and is used as a second dopand for polypyrrole. The conductivity is studied as a function of temperature in the range 77 less than or equal to T less than or equal to 300 K. The temperature dependence of the total ac conductivity, in the frequency range 10(2)-10(5) Hz, changes by approximately five orders of magnitude, showing a sub-linear dispersive behaviour. The temperature dependence of the de conductivity gives evidence for a transport mechanism based on the Mott's variable-range hopping model in one dimension for the PPy-POP composite, which shows a crossover to three dimensions for the PPy-POP-MPcTS composites. Using this model we were able to calculate meaningful values for the density of states, hopping energy and hopping distance.
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