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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Novel insights on the physicochemical properties of eumelanins and their DMSO derivatives

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Author(s):
Albano, Luiz G. S. ; Di Mauro, Eduardo ; Kumar, Prajwal ; Cicoira, Fabio ; Graeff, Carlos F. O. ; Santato, Clara
Total Authors: 6
Document type: Journal article
Source: Polymer International; v. 65, n. 11, p. 1315-1322, NOV 2016.
Web of Science Citations: 8
Abstract

The biopigment eumelanin, ubiquitous in flora and fauna, is made up of chemically heterogeneous macromolecules based on the 5,6-dihydroxyindole and 5,6-dihydroxyindole-2-carboxylic acid building blocks. The exciting possibility of designing eumelanin-based technologies for bioelectronics and sustainable electronics has to be properly assessed by gaining insights on the charge transfer and charge carrier transport in the pigment, preferably in film form, easily amenable to devices. In this work, we report a study on the electrochemical behaviour of films of eumelanin and its derivatives synthesized in dimethyl sulfoxide (DMSO eumelanins) in different aqueous electrolytes, with different chemical compositions and pH. DMSO eumelanins feature an improved solubility in the solvent DMSO, of relevance for processing purposes. The voltammetric currents are higher at relatively low pH (5.5), as expected considering the well-established proton transport properties of the biopigment. Raman spectroscopy and atomic force microscopy performed on eumelanin films were combined with thermogravimetry with the aim of advancing knowledge on the molecular and supramolecular features of synthetic commercially available eumelanin, DMSO eumelanins as well as natural eumelanin (Sepia melanin). The results collected permit unprecedented insights on the physicochemical properties of eumelanin. (c) 2016 Society of Chemical Industry (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 14/25332-9 - Bioprotonic transistors using eumelanin thin films
Grantee:Luíz Gustavo Simão Albano
Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)