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Session F29 - DMP: CONDUCTING POLYMERS V: POLYANILINE
Mixed session, Tuesday morning, March 21, 11:00
California Room, Fairmont Hotel
We report the optical reflectance from thin films of polyaniline doped with camphor-sulfonic acid from solutions of CHCl _3 /m-cresol mixtures prepared in a variety of environments. The films, which are cast with solvent competition, show a systematic variation in optical response. Kramers-Kronig analysis shows that the optical conductivity demonstrates that with increasing order, Drude behavior occurs in the far IR. The real part of the dielectric function shows three zero crossings, with a Drude plasma frequency which develops in the far IR, as predicted from microwave studies. ^1 In some cases, the conductivity of the films improves on aging. This unusual behavior will be discussed in terms of the key role of inhomogeneous disorder. \noindent ^1 J. Joo, et al., Phys. Rev. B 49, 2977 (1994). \noindent ^* Supported in part by ONR.