K. Yoshino, Y. Manda, K. Sawada
Apr 15, 1989
Citations
0
Influential Citations
19
Citations
Journal
Journal of the Physical Society of Japan
Abstract
Poly(3,4-dialkylthiophene) films prepared by both electrochemical and chemical methods utilizing FeCl 3 as catalyst exhibit much larger band gap compared with non-substituted and 3-substituted polythiophene films. Poly(3,4-dialkylthiophene)s with long alkyl chains are soluble in several solvent. However, thermochromism has not been found contrary to poly(3-alkylthiophene), which are explained in terms of large torsion angle between neighbouring thiophene rings due to the steric hindrance by bulky alkyl group. Poly(3,4-dimethylthiophene) with large band gap also demonstrates drastic spectral, electron spin resonance (ESR) and conductivity changes upon doping due to an insulator-metal transition.