Melanin system composition analyzed by XPS depth profiling

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dc.contributor.authorPaulin, J. V. [UNESP]
dc.contributor.authorMcGettrick, J. D.
dc.contributor.authorGraeff, C. F.O. [UNESP]
dc.contributor.authorMostert, A. B.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSingleton Park
dc.contributor.institutionCrymlyn Burrows
dc.date.accessioned2021-06-25T10:25:34Z
dc.date.available2021-06-25T10:25:34Z
dc.date.issued2021-06-01
dc.description.abstractThe melanins are a class of natural pigments ubiquitous throughout the biosphere. These pigments are gaining significant attention as advanced materials due to their biocompatibility, optical and electrical properties. The most common form of melanin, eumelanin, has a well-known problem of insolubility in most common solvents. The insolubility has made standard chemical analysis challenging, leading to researchers opting to use X-Ray photoelectron spectroscopy (XPS). However, standard XPS used on melanins and related materials have been limited to being a surface technique, and hence reported values to date may not reflect the bulk. In this work, we have investigated with XPS depth-profiling method the chemical information of the surface and the bulk of powder and thin-films of eumelanin and several melanin derivatives. These latter derivatives are modified melanins designed to overcome the insolubility of the standard systems. Our result indicates that there are only few differences in the chemical composition of the melanin chemical structure between the surface and bulk, for either the powder of film samples. Our results show that a basic surface probe is sufficient to obtain an accurate elemental composition for basic melanin samples. As such, our analysis indicates that XPS characterization is an important characterization of polyindolequinone systems in general such as the melanins and polydopamines.en
dc.description.affiliationSão Paulo State University (UNESP) School of Sciences Postgraduate Program in Materials Science and Technology (POSMAT)
dc.description.affiliationSwansea University Department of Physics Singleton Park
dc.description.affiliationSPECIFIC Swansea University College of Engineering Bay Campus Fabian Way Crymlyn Burrows
dc.description.affiliationSão Paulo State University (UNESP) School of Sciences Department of Physics
dc.description.affiliationSwansea University Department of Chemistry Singleton Park
dc.description.affiliationUnespSão Paulo State University (UNESP) School of Sciences Postgraduate Program in Materials Science and Technology (POSMAT)
dc.description.affiliationUnespSão Paulo State University (UNESP) School of Sciences Department of Physics
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.description.sponsorshipIdFAPESP: 2015/23000-1
dc.description.sponsorshipIdFAPESP: 2018/02411-1
dc.identifierhttp://dx.doi.org/10.1016/j.surfin.2021.101053
dc.identifier.citationSurfaces and Interfaces, v. 24.
dc.identifier.doi10.1016/j.surfin.2021.101053
dc.identifier.issn2468-0230
dc.identifier.scopus2-s2.0-85102522157
dc.identifier.urihttp://hdl.handle.net/11449/206042
dc.language.isoeng
dc.relation.ispartofSurfaces and Interfaces
dc.sourceScopus
dc.subjectDepth-profile XPS, Polyindolequinone
dc.subjectEumelanin
dc.subjectMelanin derivatives
dc.subjectPolydopamine
dc.subjectX-ray photoelectron spectroscopy
dc.titleMelanin system composition analyzed by XPS depth profilingen
dc.typeArtigo
unesp.author.orcid0000-0002-2379-6203 0000-0002-2379-6203[1]
unesp.author.orcid0000-0002-7719-2958[2]
unesp.author.orcid0000-0003-0162-8273 0000-0003-0162-8273[3]
unesp.author.orcid0000-0002-9590-2124[4]

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