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Transport Properties of Conductive Polymers.
Final rept. 1 Aug 86-30 Sep 87,
ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER
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A series of free standing films of doped polypyrrole were prepared and characterized by infrared spectroscopic methods. The frequency dependence of the infrared reflectivity of the polymer films was fit to the Drude model for the dielectric function an electron gas. In order to adequately model the observed reflectance spectra, an additional oscillator term was added to the dielectric function to account for electronic transitions that involve mid gap electronic states. Approximate values for the plasma resonance frequency for these materials range between 1-4 x 10 to the -15th s, while values for the carrier scattering time were on the order of 10 to the -15s. The spectral analysis also allowed for the calculation of the complex dielectric constants. These constants appeared to scale with the dc conductivity of the polymer film. It is suggested that the very short carrier scattering time in conducting polymers limits the observed conductivity and that improvements in conducting polymer synthesis and processing techniques will ultimately result in much higher conductivity levels.
APPROVED FOR PUBLIC RELEASE