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  • Title: Electrocatalytic and magnetic properties of ultrathin nanostructured iron-melanin films on Au(111).
    Author: González Orive A, Dip P, Gimeno Y, Díaz P, Carro P, Hernández Creus A, Benítez G, Schilardi PL, Andrini L, Requejo F, Salvarezza RC.
    Journal: Chemistry; 2007; 13(2):473-82. PubMed ID: 17009373.
    Abstract:
    We have prepared ultrathin, nanostructured melanin films on Au(111) by means of electrochemical self-assembly. These films were characterized by using Auger electron spectroscopy, X-ray absorption near-edge structure spectroscopy, scanning tunneling microscopy, magnetic force microscopy, and electrochemical techniques. Two types of nanostructures are present in the film: melanin nanoparticles and Fe(3)O(4) nanoparticles. The melanin nanoparticles contain Fe bonded to oxygen-containing phenolic groups in an octahedral configuration similar to that found in Fe(2)O(3). The inorganic-organic composite exhibits magnetic properties and catalyzes the electroreduction of hydrogen peroxide in alkaline and neutral electrolyte solutions. The electrocatalytic activity depends on the Fe-bound melanin and appears to be similar to that found for Fe-porphyrins.
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