Shedding light on the free radical nature of sulfonated melanins

Detalhes bibliográficos
Autor(a) principal: Batagin-Neto, A. [UNESP]
Data de Publicação: 2020
Outros Autores: Mostert, A. B., Paulin, J. V. [UNESP], Meredith, P., Graeff, C. F.O. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1021/acs.jpcb.0c08097
http://hdl.handle.net/11449/205504
Resumo: Melanin, an important class of natural pigment found in the human body, has stood out as a promising bioelectronic material due to its rather unique collection of electrical properties and biocompatibility. Among the available melanin derivatives, the sulfonated form has proven to not only be able to produce homogeneous device quality thin films with excellent adhesion, even on hydrophobic surfaces, but also to act as an ion to electron transducing element. It has recently been shown that the transport physics (and dominant carrier generation) may be related to a semiquinone free radical species in these materials. Hence, a better understanding of the paramagnetic properties of sulfonated derivatives could shed light on their charge transport behavior and thus enable improvement in regard to use in bioelectronics. Motivated by this question, in this work, different sulfonated melanin derivatives were investigated by hydration-controlled, continuous-wave X-band electron paramagnetic resonance spectroscopy and electronic structure calculations. Our results show that sulfonated melanin behaves similarly to non-functionalized melanin, but demonstrates a less pronounced response to humidity vis-a-vis standard melanin. We thus speculate on the structural and charge transport behavior in light of these differences with a view to further engineering structure−property relationships.
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spelling Shedding light on the free radical nature of sulfonated melaninsMelanin, an important class of natural pigment found in the human body, has stood out as a promising bioelectronic material due to its rather unique collection of electrical properties and biocompatibility. Among the available melanin derivatives, the sulfonated form has proven to not only be able to produce homogeneous device quality thin films with excellent adhesion, even on hydrophobic surfaces, but also to act as an ion to electron transducing element. It has recently been shown that the transport physics (and dominant carrier generation) may be related to a semiquinone free radical species in these materials. Hence, a better understanding of the paramagnetic properties of sulfonated derivatives could shed light on their charge transport behavior and thus enable improvement in regard to use in bioelectronics. Motivated by this question, in this work, different sulfonated melanin derivatives were investigated by hydration-controlled, continuous-wave X-band electron paramagnetic resonance spectroscopy and electronic structure calculations. Our results show that sulfonated melanin behaves similarly to non-functionalized melanin, but demonstrates a less pronounced response to humidity vis-a-vis standard melanin. We thus speculate on the structural and charge transport behavior in light of these differences with a view to further engineering structure−property relationships.School of Sciences Postgraduate Program in Science and Technology of Materials (POSMAT) São Paulo State University (UNESP)São Paulo State University (UNESP)Department of Chemistry Swansea UniversityDepartment of Physics Swansea UniversitySchool of Mathematics and Physics University of QueenslandSchool of Sciences Postgraduate Program in Science and Technology of Materials (POSMAT) School of Sciences Department of Physics São Paulo State University (UNESP)School of Sciences Postgraduate Program in Science and Technology of Materials (POSMAT) São Paulo State University (UNESP)São Paulo State University (UNESP)School of Sciences Postgraduate Program in Science and Technology of Materials (POSMAT) School of Sciences Department of Physics São Paulo State University (UNESP)Universidade Estadual Paulista (Unesp)Swansea UniversityUniversity of QueenslandBatagin-Neto, A. [UNESP]Mostert, A. B.Paulin, J. V. [UNESP]Meredith, P.Graeff, C. F.O. [UNESP]2021-06-25T10:16:26Z2021-06-25T10:16:26Z2020-11-19info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10365-10373http://dx.doi.org/10.1021/acs.jpcb.0c08097Journal of Physical Chemistry B, v. 124, n. 46, p. 10365-10373, 2020.1520-52071520-6106http://hdl.handle.net/11449/20550410.1021/acs.jpcb.0c080972-s2.0-85096456757Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Physical Chemistry Binfo:eu-repo/semantics/openAccess2021-10-23T14:40:59Zoai:repositorio.unesp.br:11449/205504Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:36:38.535953Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Shedding light on the free radical nature of sulfonated melanins
title Shedding light on the free radical nature of sulfonated melanins
spellingShingle Shedding light on the free radical nature of sulfonated melanins
Batagin-Neto, A. [UNESP]
title_short Shedding light on the free radical nature of sulfonated melanins
title_full Shedding light on the free radical nature of sulfonated melanins
title_fullStr Shedding light on the free radical nature of sulfonated melanins
title_full_unstemmed Shedding light on the free radical nature of sulfonated melanins
title_sort Shedding light on the free radical nature of sulfonated melanins
author Batagin-Neto, A. [UNESP]
author_facet Batagin-Neto, A. [UNESP]
Mostert, A. B.
Paulin, J. V. [UNESP]
Meredith, P.
Graeff, C. F.O. [UNESP]
author_role author
author2 Mostert, A. B.
Paulin, J. V. [UNESP]
Meredith, P.
Graeff, C. F.O. [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Swansea University
University of Queensland
dc.contributor.author.fl_str_mv Batagin-Neto, A. [UNESP]
Mostert, A. B.
Paulin, J. V. [UNESP]
Meredith, P.
Graeff, C. F.O. [UNESP]
description Melanin, an important class of natural pigment found in the human body, has stood out as a promising bioelectronic material due to its rather unique collection of electrical properties and biocompatibility. Among the available melanin derivatives, the sulfonated form has proven to not only be able to produce homogeneous device quality thin films with excellent adhesion, even on hydrophobic surfaces, but also to act as an ion to electron transducing element. It has recently been shown that the transport physics (and dominant carrier generation) may be related to a semiquinone free radical species in these materials. Hence, a better understanding of the paramagnetic properties of sulfonated derivatives could shed light on their charge transport behavior and thus enable improvement in regard to use in bioelectronics. Motivated by this question, in this work, different sulfonated melanin derivatives were investigated by hydration-controlled, continuous-wave X-band electron paramagnetic resonance spectroscopy and electronic structure calculations. Our results show that sulfonated melanin behaves similarly to non-functionalized melanin, but demonstrates a less pronounced response to humidity vis-a-vis standard melanin. We thus speculate on the structural and charge transport behavior in light of these differences with a view to further engineering structure−property relationships.
publishDate 2020
dc.date.none.fl_str_mv 2020-11-19
2021-06-25T10:16:26Z
2021-06-25T10:16:26Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1021/acs.jpcb.0c08097
Journal of Physical Chemistry B, v. 124, n. 46, p. 10365-10373, 2020.
1520-5207
1520-6106
http://hdl.handle.net/11449/205504
10.1021/acs.jpcb.0c08097
2-s2.0-85096456757
url http://dx.doi.org/10.1021/acs.jpcb.0c08097
http://hdl.handle.net/11449/205504
identifier_str_mv Journal of Physical Chemistry B, v. 124, n. 46, p. 10365-10373, 2020.
1520-5207
1520-6106
10.1021/acs.jpcb.0c08097
2-s2.0-85096456757
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Physical Chemistry B
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 10365-10373
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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