Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films

Abstract The origin of eumelanin optical properties remains a formidable conundrum preventing a detailed understanding of the complex photo-protective role of these widespread natural pigments and the rational design of innovative bioinspired materials for optoelectronic applications. Here we report...

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Autores principales:	Carmela Bonavolontà, Corrado de Lisio, Marco d’Ischia, Pasqualino Maddalena, Paola Manini, Alessandro Pezzella, Massimo Valentino
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9571aa005e624bf68ddd3666479cfdbd
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spelling	oai:doaj.org-article:9571aa005e624bf68ddd3666479cfdbd2021-12-02T16:06:04ZAnomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films10.1038/s41598-017-00597-82045-2322https://doaj.org/article/9571aa005e624bf68ddd3666479cfdbd2017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00597-8https://doaj.org/toc/2045-2322Abstract The origin of eumelanin optical properties remains a formidable conundrum preventing a detailed understanding of the complex photo-protective role of these widespread natural pigments and the rational design of innovative bioinspired materials for optoelectronic applications. Here we report the unusual kinetic and thickness-dependent evolution of the optical properties of black eumelanin polymers generated by spontaneous aerial polymerization of 5,6-dihydroxyindole (DHI) thin films (0.1–1 μm), consistent with peculiar solid state reorganization mechanisms governing broadband absorption. The complete reversal of eumelanin UV-visible transmittance spectrum curvature on passing from 0.2 to 0.5 μm thick films, the marked increase in visible extinction coefficients with increasing film thickness and the higher UV extinction coefficients in slowly vs. rapidly generated polymers concur to support distinct dynamic regimes of solid-state molecular reorganization at the nanoscale level and to do affect the development of broadband visible absorption. Solid state control of molecular reorganization disclosed herein may delineate new rational strategies for tuning optical properties in eumelanin thin films for optoelectronic applications.Carmela BonavolontàCorrado de LisioMarco d’IschiaPasqualino MaddalenaPaola ManiniAlessandro PezzellaMassimo ValentinoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Carmela Bonavolontà Corrado de Lisio Marco d’Ischia Pasqualino Maddalena Paola Manini Alessandro Pezzella Massimo Valentino Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
description	Abstract The origin of eumelanin optical properties remains a formidable conundrum preventing a detailed understanding of the complex photo-protective role of these widespread natural pigments and the rational design of innovative bioinspired materials for optoelectronic applications. Here we report the unusual kinetic and thickness-dependent evolution of the optical properties of black eumelanin polymers generated by spontaneous aerial polymerization of 5,6-dihydroxyindole (DHI) thin films (0.1–1 μm), consistent with peculiar solid state reorganization mechanisms governing broadband absorption. The complete reversal of eumelanin UV-visible transmittance spectrum curvature on passing from 0.2 to 0.5 μm thick films, the marked increase in visible extinction coefficients with increasing film thickness and the higher UV extinction coefficients in slowly vs. rapidly generated polymers concur to support distinct dynamic regimes of solid-state molecular reorganization at the nanoscale level and to do affect the development of broadband visible absorption. Solid state control of molecular reorganization disclosed herein may delineate new rational strategies for tuning optical properties in eumelanin thin films for optoelectronic applications.
format	article
author	Carmela Bonavolontà Corrado de Lisio Marco d’Ischia Pasqualino Maddalena Paola Manini Alessandro Pezzella Massimo Valentino
author_facet	Carmela Bonavolontà Corrado de Lisio Marco d’Ischia Pasqualino Maddalena Paola Manini Alessandro Pezzella Massimo Valentino
author_sort	Carmela Bonavolontà
title	Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
title_short	Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
title_full	Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
title_fullStr	Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
title_full_unstemmed	Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
title_sort	anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9571aa005e624bf68ddd3666479cfdbd
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Anomalous evolution of broadband optical absorption reveals dynamic solid state reorganization during eumelanin build-up in thin films

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