In Situ Formation of Dendrites in Eumelanin Thin Films between Gold Electrodes

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dc.contributor.authorWünsche, Julia
dc.contributor.authorCardenas, Luis
dc.contributor.authorRosei, Federico
dc.contributor.authorCicoira, Fabio
dc.contributor.authorGauvin, Reynald
dc.contributor.authorGraeff, Carlos Frederico de Oliveira [UNESP]
dc.contributor.authorPoulin, Suzie
dc.contributor.authorPezzella, Alessandro
dc.contributor.authorSantato, Clara
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:29:40Z
dc.date.available2014-05-27T11:29:40Z
dc.date.issued2013-06-12
dc.description.abstractEumelanin is a ubiquitous pigment in the human body, animals, and plants, with potential for bioelectronic applications because of its unique set of physical and chemical properties, including strong UV-vis absorption, mixed ionic/electronic conduction, free radical scavenging and anti-oxidant properties. Herein, a detailed investigation is reported of eumelanin thin films grown on substrates patterned with gold electrodes as a model system for device integration, using electrical measurements, atomic force microscopy, scanning electron microscopy, fluorescence microscopy, and time-of-flight secondary ion mass spectroscopy. Under prolonged electrical biasing in humid air, one can observe gold dissolution and formation of gold-eumelanin nanoaggregates, the assembly of which leads to the formation of dendrites forming conductive pathways between the electrodes. Based on results collected with eumelanins from different sources, a mechanism is proposed for the formation of the nanoaggregates and dendrites, taking into account the metal binding properties of eumelanin. The surprising interaction between eumelanin and gold points to new opportunities for the fabrication of eumelanin-gold nanostructures and biocompatible memory devices and should be taken into account in the design of devices based on eumelanin thin films. © 2013 WILEY-VCH Verlag GmbH & Co.en
dc.identifierhttp://dx.doi.org/10.1002/adfm.201300715
dc.identifier.citationAdvanced Functional Materials, v. 10, n. 6, 2013.
dc.identifier.doi10.1002/adfm.201300715
dc.identifier.issn1616-301X
dc.identifier.issn1616-3028
dc.identifier.orcid0000-0003-0162-8273
dc.identifier.scopus2-s2.0-84878744395
dc.identifier.urihttp://hdl.handle.net/11449/75635
dc.identifier.wosWOS:000330965800003
dc.language.isoeng
dc.relation.ispartofAdvanced Functional Materials
dc.relation.ispartofjcr13.325
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBioelectronics
dc.subjectEumelanin thin films
dc.subjectGold nanostructures
dc.subjectMetal chelation
dc.subjectResistive change
dc.titleIn Situ Formation of Dendrites in Eumelanin Thin Films between Gold Electrodesen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
unesp.author.lattes5268607684223281[6]
unesp.author.orcid0000-0003-0162-8273[6]

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