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We report the synthesis of polypyrrole composite films by chemical oxidation polymerization of pyrrole diffused
inside poly(vinylidene fluoride) matrix and temperature dependant dc conductivity study of these composite films.
Ammonium persulfate is used as an oxidizing agent and HCl as the dopant in aqueous medium. This technique produces
highly conductive, flexible and free standing polymer composite films in semi-interpenetrating architecture. It is observed
that conductivity of the composite films can be controlled by varying the dopant concentration. The variation of conductivity
with temperature indicates the semiconducting nature of these composite films. The temperature dependence of
conductivity is explained in the light of two different models from which activation energy (Ea) and other hopping parameters
are determined. Experimental data fits well with variable range hopping model and three dimensional charge
transport mechanism is shown to occur in these films.