Melanin-like units concentration effects in melanin-like/vanadium pentoxide hybrid compounds.
dc.contributor.author | Arashiro, Everaldo | |
dc.contributor.author | Zampronio, Elaine Cabrini | |
dc.contributor.author | Brunello, Carlos Alberto | |
dc.contributor.author | Lassali, Tânia Aparecida Farias | |
dc.contributor.author | Oliveira, Herenilton Paulino | |
dc.contributor.author | Graeff, Carlos Frederico de Oliveira | |
dc.date.accessioned | 2012-11-29T13:07:00Z | |
dc.date.available | 2012-11-29T13:07:00Z | |
dc.date.issued | 2001 | |
dc.description.abstract | An intercalated material has been prepared consisting of a regular alternation of organic/inorganic layers. The films were obtained by reacting 3,4-dihydroxy-phenylalanine (dl-DOPA) with varying concentrations in a solution with freshly prepared HVO3, which suffered a oxidative polymerization/intercalation ‘in situ’ process, forming a green suspension, in which after de-hydration at room temperature produces a nanocomposite with a dark blue metallic color. Films (C8H9NO2)xV2O5•nH2O were characterized using FT–IR, ESR, powder X-ray diffraction, conductivity, and cyclic voltammetry. The X-ray diffractograms indicate that the lamellar structure of the V2O5 is preserved for low concentrations of melanin-likeunits (x<0.02), but the inter-planar space increases from 1.2 nm to ca. 1.5 nm. The FT–IR and ESR spectra confirm that the V2O5 structure is preserved, however the presence of melanin-likeunits induces the reduction of V(V) ions to V(IV) ions. The melanin insertion is observed to increase the stability and reproducibility of the electrochemical insertion/de-insertion of Li+. The incorporation of melanin-like structures increases the conductivity, followed by a decrease in its temperature activation energy. | pt_BR |
dc.identifier.citation | ARASHIRO, E. et al. Melanin-like units concentration effects in melanin-like/vanadium pentoxide hybrid compounds. International Journal of Inorganic Materials, v. 3, n. 7, p. 727-731, nov. 2001. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1466604901001842>. Acesso em: 29 nov. 2012. | pt_BR |
dc.identifier.issn | 12932558 | |
dc.identifier.uri | http://www.repositorio.ufop.br/handle/123456789/1891 | |
dc.language.iso | en_US | pt_BR |
dc.rights.license | O periódico International Journal of Inorganic Materials concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3347780114015. | |
dc.subject | Vanadium pentoxide xerogel | pt_BR |
dc.subject | Melanin and nanocomposite | pt_BR |
dc.subject | Intercalation compounds | pt_BR |
dc.title | Melanin-like units concentration effects in melanin-like/vanadium pentoxide hybrid compounds. | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
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