Polarized resonance Raman scattering of iodine-doped polyacetylene with high conductivity

Abstract We investigated the structure and alignment of iodine dopant in the highly conducting polyacetylene (HCPA) with different doping concentration by using polarized resonance Raman spectroscopy (PRRS). It was found for the first time that the I 3 − species is predominant in the highly stretched HCPA film even for the highly doping level ((CHI 0.25 ) x ), in contrast with traditional polyacetylene. We also observed that the intensity ratio of I 3 − /I 5 − and the orientation of I 3 − species increase greatly with increasing initial draw ration of the polyacetylene films.