One-dimensional organic giant dielectrics

Abstract

Organic dielectric gate in organic thin film transistor is a great challenge due to lack of suitable materials with high permittivity value. Here we report the observation of giant dielectric response (ε ~ 10) as a result of Gor'kov-Eliashberg effect in conducting polypyrrole nanorods synthesized by chemical route in nanoporus template. These nanorods are essentially comprised of metallic chain segments interrupted by chemical defects, cross-linking and entanglement of the chains. Dielectric modulus spectra of the samples show a (KWW) exponent β equal to 1. This unusual result is ascribed to the structural order in the metal segment of the aligned polypyrrole chain.