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Understanding Melanin: A Nano-Based Material for the future

Bernard Mostert Orcid Logo, P Meredith, B Powell, I Gentle, G Hanson, F Pratt

Nanomaterials, Issue: 1st

Swansea University Author: Bernard Mostert Orcid Logo

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DOI (Published version): 10.1201/b20041-6

Abstract

Melanin, the human skin pigment, is an emerging bioelectronic material due to its unique electrical properties as well as being readily prepared in electronic grade thin films on the nanometer scale. These electrical properties include bistable electrical switching, broadband optical absorbance, Arrh...

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Published in: Nanomaterials
ISBN: 978-981-4669-72-6 978-981-4669-73-3
Published: New York Pan Stanford 2016
URI: https://cronfa.swan.ac.uk/Record/cronfa38478
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spelling v2 38478 2018-02-09 Understanding Melanin: A Nano-Based Material for the future a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2018-02-09 BGPS Melanin, the human skin pigment, is an emerging bioelectronic material due to its unique electrical properties as well as being readily prepared in electronic grade thin films on the nanometer scale. These electrical properties include bistable electrical switching, broadband optical absorbance, Arrhenius-dependent conductivity, and an electron paramagnetic free-radical signal. Furthermore, melanin has other electrical properties, such as water-dependent conductivity and potential protonic conduction. However, to use melanin as a bioelectronic material, greater clarity is required on its charge transport behavior. Here we show that the current charge transport model for melanin, an amorphous semiconductor model, cannot describe melanin’s hydration-dependent conductivity. We go on to show with a hydration-dependent muon spin resonance (μSR) experiment that melanin’s charge transport properties are described by a comproportionation reaction, in which water self-dopes the system with extra charge carriers. This new understanding of melanin’s charge transport properties opens up new avenues of exploration. We specifically see melanin as a candidate for nanoscale devices, which can act as transducers of ionic signals to electronic signals. Book chapter Nanomaterials 1st Pan Stanford New York 978-981-4669-72-6 978-981-4669-73-3 Melanin, muon spin resonance, bioelectronics, charge transport, free radical 22 1 2016 2016-01-22 10.1201/b20041-6 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2024-07-31T22:03:39.2563627 2018-02-09T12:27:42.4744234 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Bernard Mostert 0000-0002-9590-2124 1 P Meredith 2 B Powell 3 I Gentle 4 G Hanson 5 F Pratt 6
title Understanding Melanin: A Nano-Based Material for the future
spellingShingle Understanding Melanin: A Nano-Based Material for the future
Bernard Mostert
title_short Understanding Melanin: A Nano-Based Material for the future
title_full Understanding Melanin: A Nano-Based Material for the future
title_fullStr Understanding Melanin: A Nano-Based Material for the future
title_full_unstemmed Understanding Melanin: A Nano-Based Material for the future
title_sort Understanding Melanin: A Nano-Based Material for the future
author_id_str_mv a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv a353503c976a7338c7708a32e82f451f_***_Bernard Mostert
author Bernard Mostert
author2 Bernard Mostert
P Meredith
B Powell
I Gentle
G Hanson
F Pratt
format Book chapter
container_title Nanomaterials
container_issue 1st
publishDate 2016
institution Swansea University
isbn 978-981-4669-72-6
978-981-4669-73-3
doi_str_mv 10.1201/b20041-6
publisher Pan Stanford
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 Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
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description Melanin, the human skin pigment, is an emerging bioelectronic material due to its unique electrical properties as well as being readily prepared in electronic grade thin films on the nanometer scale. These electrical properties include bistable electrical switching, broadband optical absorbance, Arrhenius-dependent conductivity, and an electron paramagnetic free-radical signal. Furthermore, melanin has other electrical properties, such as water-dependent conductivity and potential protonic conduction. However, to use melanin as a bioelectronic material, greater clarity is required on its charge transport behavior. Here we show that the current charge transport model for melanin, an amorphous semiconductor model, cannot describe melanin’s hydration-dependent conductivity. We go on to show with a hydration-dependent muon spin resonance (μSR) experiment that melanin’s charge transport properties are described by a comproportionation reaction, in which water self-dopes the system with extra charge carriers. This new understanding of melanin’s charge transport properties opens up new avenues of exploration. We specifically see melanin as a candidate for nanoscale devices, which can act as transducers of ionic signals to electronic signals.
published_date 2016-01-22T22:03:40Z
_version_ 1806130028860145664
score 11.037056

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