Arashiro, EveraldoZampronio, Elaine CabriniBrunello, Carlos AlbertoLassali, Tânia Aparecida FariasOliveira, Herenilton PaulinoGraeff, Carlos Frederico de Oliveira2012-11-292012-11-292001ARASHIRO, 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. 2012.12932558http://www.repositorio.ufop.br/handle/123456789/1891An 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.en-USVanadium pentoxide xerogelMelanin and nanocompositeIntercalation compoundsArtigo publicado em periodicoO periódico International Journal of Inorganic Materials concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3347780114015.