Abstract
Dielectric spectroscopy in the frequency 10−2–107Hz and temperature 253–393K ranges has been used in order to examine polarization effects and charge carrier motion in synthetic dopa-melanin with relation to the molecular structure of the polymer. Charge hopping process is postulated to be the main mechanism involved in the dielectric response of melanin at low frequencies. Two relaxation regions attributed to the water-dependent hopping polarization have been found. According to the spatial model of the molecular arrangement in melanin, two main hopping distances, ∼1.5 and ∼3.6nm have been estimated. Changes in the hydration state of melanin upon heating cause an increase in hopping distances.
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