Nonenzymatic glucose sensing based on deposited palladium nanoparticles on epoxy-silver electrodes |
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Authors: | Albert Guté s,Carlo Carraro,Roya Maboudian |
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Affiliation: | Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, CA 94720, USA |
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Abstract: | A new approach for nonenzymatic glucose sensing, based on a simple modification of epoxy-silver surfaces deposited on the tip of commercial copper electric wires, is presented. Palladium was galvanically displaced on the surface of the epoxy-silver surface in order to obtain metal nanoparticles that act as catalyst for the direct oxidation of glucose. Scanning electron microscopy revealed the formation of the metal nanoparticles. X-ray photoelectron spectroscopy confirmed the metallic nature of the formed nanostructures on the surface. Electrochemical characterization and calibration of the palladium-modified epoxy-silver electrode is reported, obtaining a linear range of 1–20 mM for the detection of glucose with low interference of ascorbic acid and uric acid. A simple 3-step coulometry was used as the detection technique. The developed sensing material is believed to be a great candidate for integration in small devices for clinical essays, due to the simplicity and cost effectiveness of the presented approach, compared to the state-of-the-art devices reported recently in the literature. Simplicity in the coulometry determinations makes these Pd-modified epoxy-silver sensors a good candidate for easy glucose determinations. |
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Keywords: | Glucose sensor Nonenzymatic Electrochemistry Galvanic displacement Epoxy-silver Palladium |
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