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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...
Oxygen reduction and diffusion in electroactive nanostructured membranes (ENM) ...
Crespilho, Frank N.; Nart, Francisco C.; Oliveira Jr., Osvaldo N.; Brett, Christopher M. A.The fabrication of an electroactive nanostructured membrane (ENM) for oxygen reduction, made of layer-by-layer (LbL) films comprising Au nanoparticle-containing amine-terminated G4 PAMAM dendrimer alternated with poly(vinylsulfonic acid) (PVS) layers is reported. Electrochemical impedance spectroscopy and cyclic voltammetry show that electrodes with PVS/PAMAM-Au multiple bilayers are efficient for oxygen reduct...
Electroactive Nanostructured Membranes (ENM): Synthesis and Electrochemical Pro...
Crespilho, Frank N.; Ghica, M. Emilia; Zucolotto, Valtencir; Nart, Francisco C.; Oliveira Jr., Osvaldo N.; Brett, Christopher M. A.The layer-by-layer (LbL) self-assembly process has become an important tool in the fabrication of nanostructured devices for electrochemical applications, especially in those cases where control at the molecular level is required. In this paper we present a system based on electroactive nanostructured membranes (ENM) with ITO-PVS/PAMAM-Au LbL electrodes, in which a redox mediator (Me) is electrodeposited around...
Enhanced Charge Transport and Incorporation of Redox Mediators in Layer-by-Laye...
Crespilho, Frank N.; Zucolotto, Valtencir; Brett, Christopher M. A.; Oliveira, Osvaldo N.; Nart, Francisco C.In this work, we exploit the molecular engineering capability of the layer-by-layer (LbL) method to immobilize layers of gold nanoparticles on indium tin oxide (ITO) substrates, which exhibit enhanced charge transfer and may incorporate mediating redox substances. Polyamidoamine (PAMAM generation 4) dendrimers were used as template/stabilizers for Au nanoparticle growth, with PAMAM-Au nanoparticles serving as c...
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