AC conductivity behavior of poly(o-methoxyaniline)

The AC conductivity of doped poly(o-methoxyaniline) (POMA) films, at temperatures between 4.2 and 298 K, has been measured. For low frequencies the real part of the conductivity, σ(ω), is frequency-independent, and above a critical angular frequency γ it obeys an equation of the form σ(ω)∝ω^s. Both the DC conductivity σ₀ and the critical frequency ω increase with the temperature, however the exponential factor s is a temperature-independent quantify. It was also observed that above 10⁵ Hz, σ(ω) tends to a plateau. A nomadic polarization model of quasi-one-dimensional solids was used to fit the experimental results. Values for the bulk mobility, the carrier density and the transition rate of the intermolecular charge transfer were estimated