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In Situ Intercalation/Polymerization of Melanin into Vanadium Pentoxide

Published online by Cambridge University Press:  10 February 2011

H. P. Oliveira ,
C. L. P. S. Zanta ,
A. C. Galina  and
C. F. O. Graeff
H. P. Oliveira
Affiliation:
Departamento de Química, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil, [email protected]
C. L. P. S. Zanta
Affiliation:
Departamento de Química, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil, [email protected]
A. C. Galina
Affiliation:
Departamento de Química, FFCLRP/Universidade de São Paulo, Ribeirão Preto, SP, CEP 14040–901, Brazil, [email protected]
C. F. O. Graeff
Affiliation:
Departamento de Física e Matemática
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Abstract

In this work, intercalated material was prepared consisting of a regular interchange of organic/inorganic layers. The products were obtained by reacting 3,4-dihidroxi-fenilalanina (DL-DOPA) in a solution with V2O5.nH2O gel, which suffered an oxidative polymerization/intercalation process, forming a film with a dark blue metallic color. The films were characterized using UV\Vis transmission spectroscopy, FTLR, ESR, X-ray diffraction, dc conductivity, and cyclic voltammetry. The X-ray diffractograms indicate that the lamellar structure of the V2O5 is preserved but the inter-planar space increase from 1.18 nm to 1.38 nm. The FTIR and ESR spectra confirms that the V2O5 structure is preserved, however the presence of melanin induces the reduction of Vv ions to Viv. The increase in the inter-planar spacing is observed to increase the stability and reproducibility of the electrochemical insertion/de-insertion of Li+. This increase in stability is also observed in the electrochromic properties of the film, which are fully reproducible even after more than 60 oxidation-reduction cycles. The melanin affects also the activation energy of the dc conductivity which changes from 0.35 eV to 0.20 eV.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 576: Symposium DD – Organic/Inorganic Hybrid Materials II , 1999 , 275
Copyright
Copyright © Materials Research Society 1999

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References

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