  Here, we present theoretical analysis of electron transport in polyaniline
based (PANi) nanofibers assuming the metalic state of the material. To build up
this theory we treat conducting polymers as a special kind of granular metals,
and we apply the quantum theory of conduction in mesoscopic systems to describe
the transport between metallic-like granules. Our results show that the concept
of resonance electron tunneling as the predominating mechanism providing charge
transport between the grains is supported with recent experiments on the
electrical characterization of single PANi nanofibers. By contacting 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.
