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On the origin of electrical conductivity in the bio-electronic material melanin

A. Bernardus Mostert, Ben J. Powell, Ian R. Gentle, Paul Meredith Orcid Logo, Bernard Mostert Orcid Logo

Applied Physics Letters, Volume: 100, Issue: 9, Start page: 093701

Swansea University Authors: Paul Meredith Orcid Logo, Bernard Mostert Orcid Logo

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DOI (Published version): 10.1063/1.3688491

Abstract

The skin pigment melanin is one of a few bio-macromolecules that display electrical and photo-conductivity in the solid-state. A model for melanin charge transport based on amorphous semiconductivity has been widely accepted for 40 years. In this letter, we show that a central pillar in support of t...

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Published in: Applied Physics Letters
ISSN: 0003-6951 1077-3118
Published: 2012
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URI: https://cronfa.swan.ac.uk/Record/cronfa38487
first_indexed 2018-02-09T20:18:14Z
last_indexed 2018-02-12T14:24:39Z
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recordtype SURis
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spelling 2018-02-09T13:29:16.6409782 v2 38487 2018-02-09 On the origin of electrical conductivity in the bio-electronic material melanin 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false a353503c976a7338c7708a32e82f451f 0000-0002-9590-2124 Bernard Mostert Bernard Mostert true false 2018-02-09 BGPS The skin pigment melanin is one of a few bio-macromolecules that display electrical and photo-conductivity in the solid-state. A model for melanin charge transport based on amorphous semiconductivity has been widely accepted for 40 years. In this letter, we show that a central pillar in support of this hypothesis, namely experimental agreement with a hydrated dielectric model, is an artefact related to measurement geometry and non-equilibrium behaviour. Our results cast significant doubt on the validity of the amorphous semiconductor model and are a reminder of the difficulties of electrical measurements on low conductivity, disordered organic materials. Journal Article Applied Physics Letters 100 9 093701 0003-6951 1077-3118 Water heating, bioelectrochemistry, Semiconductor device modeling, Adsorption, Electric measurements 31 12 2012 2012-12-31 10.1063/1.3688491 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2018-02-09T13:29:16.6409782 2018-02-09T13:29:16.6565736 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics A. Bernardus Mostert 1 Ben J. Powell 2 Ian R. Gentle 3 Paul Meredith 0000-0002-9049-7414 4 Bernard Mostert 0000-0002-9590-2124 5
title On the origin of electrical conductivity in the bio-electronic material melanin
spellingShingle On the origin of electrical conductivity in the bio-electronic material melanin
Paul Meredith
Bernard Mostert
title_short On the origin of electrical conductivity in the bio-electronic material melanin
title_full On the origin of electrical conductivity in the bio-electronic material melanin
title_fullStr On the origin of electrical conductivity in the bio-electronic material melanin
title_full_unstemmed On the origin of electrical conductivity in the bio-electronic material melanin
title_sort On the origin of electrical conductivity in the bio-electronic material melanin
author_id_str_mv 31e8fe57fa180d418afd48c3af280c2e
a353503c976a7338c7708a32e82f451f
author_id_fullname_str_mv 31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
a353503c976a7338c7708a32e82f451f_***_Bernard Mostert
author Paul Meredith
Bernard Mostert
author2 A. Bernardus Mostert
Ben J. Powell
Ian R. Gentle
Paul Meredith
Bernard Mostert
format Journal article
container_title Applied Physics Letters
container_volume 100
container_issue 9
container_start_page 093701
publishDate 2012
institution Swansea University
issn 0003-6951
1077-3118
doi_str_mv 10.1063/1.3688491
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
active_str 0
description The skin pigment melanin is one of a few bio-macromolecules that display electrical and photo-conductivity in the solid-state. A model for melanin charge transport based on amorphous semiconductivity has been widely accepted for 40 years. In this letter, we show that a central pillar in support of this hypothesis, namely experimental agreement with a hydrated dielectric model, is an artefact related to measurement geometry and non-equilibrium behaviour. Our results cast significant doubt on the validity of the amorphous semiconductor model and are a reminder of the difficulties of electrical measurements on low conductivity, disordered organic materials.
published_date 2012-12-31T07:22:30Z
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score 11.3254

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