Abstract
Here, we present a theoretical analysis of electron transport in polyaniline-based (PANi) nanofibers assuming a metallic state of the material. To build up this theory we treat conducting polymers as a special kind of granular metal, and we apply the quantum theory of conduction in mesoscopic systems to describe the transport between metalliclike granules. Our results show that the concept of resonance electron tunneling as the predominating mechanism providing charge transport between the grains is supported by recent experiments on the electrical characterization of single PANi nanofibers. By confronting the proposed theory with the experimental data we estimate some important parameters characterizing the electron transport in these materials. Also, we discuss the origin of rectifying features observed in current-voltage characteristics of fibers with varying cross-sectional areas.
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