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Sensors 2013, 13(5), 5700-5711; doi:10.3390/s130505700

UV/Vis Spectroelectrochemistry as a Tool for Monitoring the Fabrication of Sensors Based on Silver Nanoparticle Modified Electrodes

Department of Chemistry, Universidad de Burgos, Pza. Misael Bañuelos s/n, E-09001 Burgos, Spain
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Received: 10 March 2013 / Revised: 23 April 2013 / Accepted: 23 April 2013 / Published: 2 May 2013
(This article belongs to the Special Issue Novel Tools in Electrochemical Sensing)
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Abstract

A new controlled current multipulse methodology has been developed to modify the screen-printed electrode surface with silver nanoparticles (AgNPs). Spectroelectrochemistry has provided not only information about the type of nanoparticles (NPs) deposited on the electrode surface, but also about the electrosynthesis process. Small NPs without plasmon band are initially generated. Next, these nuclei grow to form bigger NPs in the reduction pulses with a characteristic plasmon band centered at 400 nm. Most of the NPs are generated during the first reduction pulses and a linear growth of the absorbance at a lower reaction rate was obtained in the subsequent pulses. Oxidation pulses do not redissolve completely silver NPs but only partially, meaning that very stable NPs are generated. AgNPs-modified electrodes have been successfully used to determine hydrogen peroxide. Spectroelectrochemistry has also yielded very useful information to understand the voltammetric signal obtained during the reduction of H2O2 on silver modified electrodes.
Keywords: UV-Vis spectroelectrochemistry; silver nanoparticles; screen-printed electrodes; electrochemistry UV-Vis spectroelectrochemistry; silver nanoparticles; screen-printed electrodes; electrochemistry
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Fernández-Blanco, C.; Colina, Á.; Heras, A. UV/Vis Spectroelectrochemistry as a Tool for Monitoring the Fabrication of Sensors Based on Silver Nanoparticle Modified Electrodes. Sensors 2013, 13, 5700-5711.

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