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Development of electrochemical oxidase biosensors based on carbon nanotube-modi...
Gouveia-Caridade, Carla; Pauliukaite, Rasa; Brett, Christopher M.A.Functionalised multi-walled carbon nanotubes (MWCNTs) were cast on glassy carbon (GC) and carbon film electrodes (CFE), and were characterised electrochemically and applied in a glucose-oxidase-based biosensor. MWCNT-modified carbon film electrodes were then used to develop an alcohol oxidase (AlcOx) biosensor, in which AlcOx-BSA was cross-linked with glutaraldehyde and attached by drop-coating. The experimenta...
Enzyme immobilisation on electroactive nanostructured membranes (ENM): Optimise...
Crespilho, Frank N.; Ghica, M. Emilia; Gouveia-Caridade, Carla; Oliveira Jr., Osvaldo N.; Brett, Christopher M.A.Electroactive nanostructured membranes have been produced by the layer-by-layer (LbL) technique, and used to make electrochemical enzyme biosensors for glucose by modification with cobalt hexacyanoferrate redox mediator and immobilisation of glucose oxidase enzyme. Indium tin oxide (ITO) glass electrodes were modified with up to three bilayers of polyamidoamine (PAMAM) dendrimers containing gold nanoparticles a...
Electrochemical, morphological and microstructural characterization of carbon f...
Gouveia-Caridade, Carla; Soares, David M.; Liess, Hans-Dieter; Brett, Christopher M.A.The 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 ...
Influence of Nafion Coatings and Surfactant on the Stripping Voltammetry of Hea...
Gouveia-Caridade, Carla; Pauliukaite, Rasa; Brett, Christopher M. A.Nafion polymer coated bismuth-film-modified carbon film electrodes have been investigated for reducing the influence of contaminants such as surfactants in the anodic stripping voltammetry of trace metal ions. The influence of the coating on electrode response has been tested with both ex situ and in situ bismuth film deposition, with and without the polymer coating. The electrode assemblies and interfacial cha...
Electrochemical Impedance Characterization of Nafion-Coated Carbon Film Resisto...
Gouveia-Caridade, Carla; Brett, Christopher M. A.Carbon film disk electrodes with Nafion coatings have been characterized by electrochemical impedance spectroscopy (EIS) with a view to a better understanding of their advantages and limitations in electroanalysis, particularly in anodic stripping voltammetry of metal ions. After initial examination by cyclic voltammetry, spectra were recorded over the full potential range in acetate buffer solution at the bare...
Electrochemical noise and impedance study of aluminium in weakly acid chloride ...
Gouveia-Caridade, Carla; Pereira, M. Isabel S.; Brett, Christopher M. A.The electrochemical noise (EN) characteristics of pure aluminium in unbuffered potassium chloride solution and with acetic acid/sodium acetate buffer at pH 5.4 and 4.3 have been analysed to throw light on the influence of pH and of the presence of buffer at the aluminium surface on chloride ion-induced corrosion. Comparison has been made with results obtained by electrochemical impedance spectroscopy (EIS) and ...
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