Synthesis and characteristics of soluble polypyrroles with mixed dopants

Soluble conducting polypyrroles(Ppy) were prepared by the oxidative polymer ization of pyrrole using mixed dopants. Compared to the dodecylbenzenesulfo nic acid doped polypyrrole [Ppy-DBSA (sigma(RT) similar to 10(-1) S/cm)], t he Ppy with mixed dopants (Ppy-mixed dopants) showed higher absorption inte nsity in near IR region in UV-Vis./NIR solution spectra and partly crystall ine X-ray diffraction (XRD) patterns and higher conductivity of similar to 20 S/cm for free standing films. The Ppy-DBSA film showed three dimensional variable range hopping (3D-VRH) conducton while Ppy-mixed dopant systems 1 D-VRH conduction. These results are explained by the packing effect of plan ar dopant between the polymer chains.