Electrochemical synthesis of poly(para-phenylene) and its electrical properties

Summary form only given. Poly(p-phenylene) (PPP) films were obtained by the electrochemical polymerization of benzene in nitromethane. The as-grown films were p-type. Structures and properties of the films were found to depend signifficantly on the polymerization potential and the supporting electrolyte. Electrical conductivities of the films were measured in both plane and vertical directions. With an increase in the polymerization potential, the DC conductivities in a plane direction increased, whereas those in a vertical direction decreased. The AC conductivities were also measured in the range from 0.1 to 1000 KHz. The AC conductivities showed the anisotropy as well as the DC conductivities. It was possible to obtain n-type films by cation-doping. The band structures of the PPP films were calculated from the optical properties and the cyclic voltammograms.