Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5022
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dc.contributor.authorGouveia-Caridade, Carla-
dc.contributor.authorSoares, David M.-
dc.contributor.authorLiess, Hans-Dieter-
dc.contributor.authorBrett, Christopher M.A.-
dc.date.accessioned2008-09-01T15:02:36Z-
dc.date.available2008-09-01T15:02:36Z-
dc.date.issued2008-09-01T15:02:36Z-
dc.identifier.citationApplied Surface Science. In Press, Corrected Proof:en_US
dc.identifier.urihttp://hdl.handle.net/10316/5022-
dc.description.abstractThe electrochemical and microstructural properties of carbon film electrodes made from carbon film electrical resistors of 1.5, 15, 140 [Omega] and 2.0 k[Omega] nominal resistance have been investigated before and after electrochemical pre-treatment at +0.9 V vs SCE, in order to assess the potential use of these carbon film electrodes as electrochemical sensors and as substrates for sensors and biosensors. The results obtained are compared with those at electrodes made from previously investigated 2 [Omega] carbon film resistors. Cyclic voltammetry was performed in acetate buffer and phosphate buffer saline electrolytes and the kinetic parameters of the model redox system Fe(CN)63-/4- obtained. The 1.5 [Omega] resistor electrodes show the best properties for sensor development with wide potential windows, similar electrochemical behaviour to those of 2 [Omega] and close-to-reversible kinetic parameters after electrochemical pre-treatment. The 15 and 140 [Omega] resistor electrodes show wide potential windows although with slower kinetics, whereas the 2.0 k[Omega] resistor electrodes show poor cyclic voltammetric profiles even after pre-treatment. Electrochemical impedance spectroscopy related these findings to the interfacial properties of the electrodes. Microstructural and morphological studies were carried out using contact mode Atomic Force Microscopy (AFM), Confocal Raman spectroscopy and X-ray diffraction. AFM showed more homogeneity of the films with lower nominal resistances, related to better electrochemical characteristics. X-ray diffraction and Confocal Raman spectroscopy indicate the existence of a graphitic structure in the carbon films.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6THY-4S7BD8R-1/1/06dc918640a4700879aa96e50ac04a8ben_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectCarbon film electrodesen_US
dc.subjectCarbon film resistorsen_US
dc.subjectCyclic voltammetryen_US
dc.subjectElectrochemical impedance spectroscopyen_US
dc.subjectContact mode AFMen_US
dc.subjectConfocal Raman spectroscopyen_US
dc.subjectX-ray diffractionen_US
dc.titleElectrochemical, morphological and microstructural characterization of carbon film resistor electrodes for application in electrochemical sensorsen_US
dc.typearticleen_US
item.languageiso639-1en-
item.fulltextCom Texto completo-
item.grantfulltextopen-
crisitem.author.researchunitCentre for Mechanical Engineering-
crisitem.author.orcid0000-0002-5801-7601-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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