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Título : UV/Vis spectroelectrochemistry as a tool for monitoring the fabrication of sensors based on silver nanoparticle modified electrodes
Autor : Fernández Blanco, Ana Cristina
Colina, Álvaro
Heras, Aránzazu
Publicado en: Sensors. 2013, V. 13, n. 5, p. 5700-5711
Editorial : MDPI
Fecha de publicación : may-2013
ISSN : 1424-8220
DOI: 10.3390/s130505700
Resumen : 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.
Palabras clave: UV-Vis spectroelectrochemistry
silver nanoparticles
screen-printed electrodes
electrochemistry
Materia: Química analítica
Chemistry, Analytic
Licencia: http://creativecommons.org/licenses/by/3.0/
URI : http://hdl.handle.net/10259/4265
Versión del editor: http://dx.doi.org/10.3390/s130505700
Aparece en las colecciones: Artículos INSTRUMENTAL

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