Analysis of infrared reflectivity of conducting polymers: example of camphor-sulphonic-acid-doped polyaniline

The reflectivity spectrum of a polyaniline CSA-doped in presence of m-creso l has been measured over the wide wavenumber range of 15-9 000 cm(-1) (0.00 2-1.1 eV) at room temperature. Experimental data compare well with similar experiments performed LS another group. The conductivity spectrum of this c onducting polymer has been deduced from the reflectivity spectrum by means of two methods, Kramers-Kronig transformation and best fit of an "extended Drude" model to the reflectivity spectrum. Whereas the deviation from Drude behavior was interpreted in terms of Anderson localization or by inhomogen eous disorder by other groups, it is shown here that a different model deve loped for conducting oxides that also exhibit non-Drude behavior, applies v ery well to this example of conducting polymer.