Electrocatalytic and magnetic properties of ultrathin nanostructured iron-melanin films on Au(111) |
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Authors: | González Orive Alejandro Dip Patricio Gimeno Yurima Díaz Pilar Carro Pilar Hernández Creus Alberto Benítez Guillermo Schilardi Patricia L Andrini Leandro Requejo Felix Salvarezza Roberto C |
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Institution: | Departamento de Química Física, Facultad de Química, Universidad de La Laguna, 38071 La Laguna, Tenerife, Spain. |
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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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Keywords: | biosensors catalysis magnetic properties melanins nanostructures |
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