Ferroelectric-like behaviour of melanin: humidity effect on current-voltage characteristics

S.L. Bravina, P.M. Lutsyk, A.B. Verbitsky, N.V. Morozovsky

Research output: Contribution to journalArticle

Abstract

The influence of low vacuum on quasistatic current-voltage (I–V) dependences and the impact of wet air pulse on dynamic bipolar I-V-loops and unipolar I-V-curves of fungal melanin thin layers have been studied for the first time.
The threshold hysteresis voltages of I–V dependences are near to the standard electrode potentials of anodic water decomposition.
Short wet air pulse impact leads to sharp increase of the current and appearance of “hump”-like and “knee”-like features of I-V-loops and I-V-curves, respectively.
By treatment of I-V-loop allowing for I-V-curve shape the maxima of displacement current are revealed. The peculiarities of I-V-characteristics were modelled by series-parallel RC-circuit with Zener diodes as nonlinear elements.
As a reason of appearance of temporal polar media with reversible ferroelectric-like polarization and ionic space charge transfer is considered the water-assisted dissociation of some ionic groups of melanin monomers that significantly influences electrophysical parameters of melanin nanostructures.
Original languageEnglish
Pages (from-to)230-236
Number of pages7
JournalMaterials Research Bulletin
Volume80
Early online date29 Mar 2016
DOIs
Publication statusPublished - Aug 2016

Fingerprint

Melanin
melanin
Melanins
Current voltage characteristics
Ferroelectric materials
humidity
Atmospheric humidity
electric potential
curves
Zener diodes
RC circuits
low vacuum
avalanche diodes
Water
air
Electric potential
Air
pulses
Electric space charge
water

Bibliographical note

© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • electronic materials
  • organic compounds
  • electrical properties
  • ionic conductivity
  • ferroelectricity

Cite this

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title = "Ferroelectric-like behaviour of melanin: humidity effect on current-voltage characteristics",
abstract = "The influence of low vacuum on quasistatic current-voltage (I–V) dependences and the impact of wet air pulse on dynamic bipolar I-V-loops and unipolar I-V-curves of fungal melanin thin layers have been studied for the first time.The threshold hysteresis voltages of I–V dependences are near to the standard electrode potentials of anodic water decomposition.Short wet air pulse impact leads to sharp increase of the current and appearance of “hump”-like and “knee”-like features of I-V-loops and I-V-curves, respectively.By treatment of I-V-loop allowing for I-V-curve shape the maxima of displacement current are revealed. The peculiarities of I-V-characteristics were modelled by series-parallel RC-circuit with Zener diodes as nonlinear elements.As a reason of appearance of temporal polar media with reversible ferroelectric-like polarization and ionic space charge transfer is considered the water-assisted dissociation of some ionic groups of melanin monomers that significantly influences electrophysical parameters of melanin nanostructures.",
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Ferroelectric-like behaviour of melanin : humidity effect on current-voltage characteristics. / Bravina, S.L.; Lutsyk, P.M.; Verbitsky, A.B.; Morozovsky, N.V.

In: Materials Research Bulletin, Vol. 80, 08.2016, p. 230-236.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Bravina, S.L.

AU - Lutsyk, P.M.

AU - Verbitsky, A.B.

AU - Morozovsky, N.V.

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