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TitleNon-linear conduction and dispersion in conducting polymers
Publication TypeConference Paper
Year of Publication1996
AuthorsArnold, W.M., Harris P.D., Partridge C.A., and Andrews M.K.
Conference NameConference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report
Date Published1996
KeywordsCapacitance measurement, Charge transfer, Conductive films, Dielectric dispersion, Dielectric properties of solids, Electric conductivity of solids, Electric field effects, Electric resistance measurement, Electrodes, Nonlinear conduction, Plastic films, Polymerization, Scanning electron microscopy
AbstractThe conductivity of thin films of conducting polymer deposited between lithographically-fabricated microelectrodes was measured between 100 Hz and 40 MHz. The inter-electrode spacing of 10 μm gave field strengths up to 50 kV/m within the film in response to applied voltages up to 0.5 V. The conductance and capacitance of the films exhibited sample- and counter-ion-dependent degrees of voltage-dependency at frequencies below 1 MHz, but became essentially voltage-independent above about 30 MHz (at room temperature). The disappearance of the voltage sensitivity coincides with a dispersion in the 1-30 MHz range. These results suggest that the low-frequency conductivity of the films is determined by the difficulty involved in inter-granular or inter-domain charge transport.

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