Hopping Electron Transport in Doped Polyaniline: an Experimental Verification of the Fogler-Teber-Shklovskii Model

TL;DR

This study investigates the temperature-dependent electrical conductivity of doped polyaniline, revealing a crossover in hopping mechanisms that aligns with the Fogler-Teber-Shklovskii model's predictions for three-dimensional systems.

Contribution

It provides experimental verification of the Fogler-Teber-Shklovskii model in doped polyaniline, demonstrating a crossover between hopping regimes in conducting polymers.

Findings

Identified a crossover from variable-range to nearest-neighbor hopping below room temperature.

Constructed an experimental diagram matching the Fogler-Teber-Shklovskii model predictions.

Observed atypical hopping behavior in conducting polymers.

Abstract

We present a study of the temperature (T) dependence of the dc electrical conductivity of polyaniline pellets doped over a wide range. A crossover between low-T variable-range hopping and high-T nearest-neighbor hopping has been found below room temperature for most of the samples, which is atypical for conducting polymers. This allows us to construct an experimental diagram that accounts for different regimes in the hopping electron transport and closely resembles predictions of the Fogler-Teber-Shklovskii model in three dimensions.