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Issue 7, 2019
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Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy

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Abstract

Conductive biomolecular systems are investigated for their promise of new technologies. One biomolecular material that has garnered interest for device applications is eumelanin. Its unusual properties have led to its incorporation in a wide set of platforms including transistor devices and batteries. Much of eumelanin's conductive properties are due to a solid state redox comproportionation reaction. However, most of the work that has been done to demonstrate the role of the redox chemistry in eumelanin has been via control of eumelanin's hydration content with scant attention given to temperature dependent behavior. Here we demonstrate for the first time consistency between hydration and temperature effects for the comproportionation conductivity model utilizing dielectric spectroscopy, heat capacity measurements, frequency scaling phenomena and recognizing that activation energies in the range of ∼0.5 eV correspond to proton dissociation events. Our results demonstrate that biomolecular conductivity models should account for temperature and hydration effects coherently.

Graphical abstract: Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy

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Supplementary files

Article information


Submitted
02 Nov 2018
Accepted
22 Jan 2019
First published
29 Jan 2019

This article is Open Access

RSC Adv., 2019,9, 3857-3867
Article type
Paper

Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy

K. A. Motovilov, V. Grinenko, M. Savinov, Z. V. Gagkaeva, L. S. Kadyrov, A. A. Pronin, Z. V. Bedran, E. S. Zhukova, A. B. Mostert and B. P. Gorshunov, RSC Adv., 2019, 9, 3857
DOI: 10.1039/C8RA09093A

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    [Original citation] - Published by The Royal Society of Chemistry.

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