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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, B. P. Gorshunov, Bernard Mostert Orcid Logo

RSC Advances, Volume: 9, Issue: 7, Pages: 3857 - 3867

Swansea University Author: Bernard Mostert Orcid Logo

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DOI (Published version): 10.1039/c8ra09093a

Abstract

Conductive biomolecular systems are investigated for their promise of new technologies. Onebiomolecular material that has garnered interest for device applications is eumelanin. Its unusualproperties have led to its incorporation in a wide set of platforms including transistor devices andbatteries....

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Published in: RSC Advances
ISSN: 2046-2069
Published: RSC 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa48389
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first_indexed 2019-01-23T14:02:09Z
last_indexed 2019-06-12T20:59:25Z
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spelling 2019-06-12T15:26:34.9851711 v2 48389 2019-01-23 Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2019-01-23 SPH Conductive biomolecular systems are investigated for their promise of new technologies. Onebiomolecular material that has garnered interest for device applications is eumelanin. Its unusualproperties have led to its incorporation in a wide set of platforms including transistor devices andbatteries. Much of eumelanin's conductive properties are due to a solid state redox comproportionationreaction. However, most of the work that has been done to demonstrate the role of the redox chemistryin eumelanin has been via control of eumelanin's hydration content with scant attention given totemperature dependent behavior. Here we demonstrate for the first time consistency between hydrationand temperature effects for the comproportionation conductivity model utilizing dielectric spectroscopy,heat capacity measurements, frequency scaling phenomena and recognizing that activation energies inthe range of ~0.5 eV correspond to proton dissociation events. Our results demonstrate thatbiomolecular conductivity models should account for temperature and hydration effects coherently.NOTE: Abstract is from RSC Advances, 2019, by Motovilov et al, under the creative commons licence CC BY-NC 3.0. No changes made to the abstract. Not used for commercial purposes. Journal Article RSC Advances 9 7 3857 3867 RSC 2046-2069 Eumelanin, Dielectric Spectroscopy, Temperature, Redox Chemistry, Charge Transport, Hydration 31 12 2019 2019-12-31 10.1039/c8ra09093a COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2019-06-12T15:26:34.9851711 2019-01-23T10:38:06.6201502 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemistry K. A. Motovilov 1 V. Grinenko 2 M. Savinov 3 Z. V. Gagkaeva 4 L. S. Kadyrov 5 A. A. Pronin 6 Z. V. Bedran 7 E. S. Zhukova 8 A. B. Mostert 9 B. P. Gorshunov 10 Bernard Mostert 0000-0002-9590-2124 11 0048389-19022019165442.pdf 48389.pdf 2019-02-19T16:54:42.6200000 Output 1417606 application/pdf Version of Record true 2019-02-18T00:00:00.0000000 Released under the terms of a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (CC-BY-NC). true eng
title Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
spellingShingle Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
Bernard Mostert
title_short Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
title_full Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
title_fullStr Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
title_full_unstemmed Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
title_sort Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy
author_id_str_mv a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv a353503c976a7338c7708a32e82f451f_***_Bernard Mostert
author Bernard Mostert
author2 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
B. P. Gorshunov
Bernard Mostert
format Journal article
container_title RSC Advances
container_volume 9
container_issue 7
container_start_page 3857
publishDate 2019
institution Swansea University
issn 2046-2069
doi_str_mv 10.1039/c8ra09093a
publisher RSC
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemistry{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemistry
document_store_str 1
active_str 0
description Conductive biomolecular systems are investigated for their promise of new technologies. Onebiomolecular material that has garnered interest for device applications is eumelanin. Its unusualproperties have led to its incorporation in a wide set of platforms including transistor devices andbatteries. Much of eumelanin's conductive properties are due to a solid state redox comproportionationreaction. However, most of the work that has been done to demonstrate the role of the redox chemistryin eumelanin has been via control of eumelanin's hydration content with scant attention given totemperature dependent behavior. Here we demonstrate for the first time consistency between hydrationand temperature effects for the comproportionation conductivity model utilizing dielectric spectroscopy,heat capacity measurements, frequency scaling phenomena and recognizing that activation energies inthe range of ~0.5 eV correspond to proton dissociation events. Our results demonstrate thatbiomolecular conductivity models should account for temperature and hydration effects coherently.NOTE: Abstract is from RSC Advances, 2019, by Motovilov et al, under the creative commons licence CC BY-NC 3.0. No changes made to the abstract. Not used for commercial purposes.
published_date 2019-12-31T03:58:49Z
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score 11.016235

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