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Type: Artigo de periódico
Title: Electrochemical and surface characterisation of carbon-film-coated piezoelectric quartz crystals
Author: Pinto, EM
Gouveia-Caridade, C
Soares, DM
Brett, CMA
Abstract: The electrochemical properties of carbon films, of thickness between 200 and 500 nm, sputter-coated on gold- and platinum-coated 6 MHz piezoelectric quartz crystal oscillators, as new electrode materials have been investigated. Comparative studies under the same experimental conditions were performed on bulk electrodes. Cyclic voltammetry was carried out in 0.1 M KCl electrolyte solution, and kinetic parameters of the model redox systems Fe(CN)(6)(3+/4+) and [Ru(NH(3))(6)](3+/2+) as well as the electroactive area of the electrodes were obtained. Atomic force microscopy was used in order to examine the surface morphology of the films, and the properties of the carbon films and the electrode-solution interface were studied by electrochemical impedance spectroscopy. The results obtained demonstrate the feasibility of the preparation and development of nanometer thick carbon film modified quartz crystals. Such modified crystals should open up new opportunities for the investigation of electrode processes at carbon electrodes and for the application of electrochemical sensing associated with the EQCM. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Piezoelectric crystals
Electrochemical quartz crystal microbalance
Atomic force microscopy
Country: Holanda
Editor: Elsevier Science Bv
Citation: Applied Surface Science. Elsevier Science Bv, v. 255, n. 18, n. 8084, n. 8090, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.apsusc.2009.05.020
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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