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Melanin is a biopolymer with unique set of applicable physical and chemicalproperties. The impact of a moisture-saturated air pulse (~1 s) on dynamiccurrent-voltage (I-V-), charge-voltage (Q-V-) and transient (I-t-)characteristics of fungal melanin thin layers was investigated. The pulsehydration gives rise to sharp increase of conductance and capacitance (byI-V-loops and I-t-curves swing), transferred charge (by Q-V-loops swing) andcauses the appearance of the following peculiarities: hump-like on I-V-loops,knee-like on I-V-curves and step-like on I-t-curves. General shape of I-V-loopswas modelled under low hydration by linear series-parallel RC-circuit and underhigh hydration by the circuit with anti-series Zener diodes as nonlinearelements. By processing of bipolar I-V-loops and I-t-curves allowing forunipolar ones, the maxima of displacement current - voltage loops were revealedand their similarity to current maxima observed under ionic space chargetransfer in metal-insulator-semiconductor structures and under polarizationreversal in ferroelectrics is discussed. Corresponding processing of bipolarQ-V-loops evidences general shape of obtained dielectric displacement - voltageloops characteristic to ion-conducting materials. As a reason of observedtransformations, the appearance of temporal polar media with reversibleferroelectric-like polarization and ionic space charge transfer is considered.Obtained results disclose the functional capabilities of melanin based sensingdevices operating in dynamic mode for both hydration and driving voltage.

The peculiarities of dynamic current-voltage and charge-voltage loops and transient currents of melanin under pulse hydration