title: UV/Vis spectroelectrochemistry as a tool for monitoring the fabrication of sensors based on silver nanoparticle modified electrodes.
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.
authors: Department of Chemistry, Universidad de Burgos, Burgos, Spain. acfernandez@ubu.es
authors: Cristina
authors: C
authors: Fernández-Blanco
authors: Alvaro
authors: A
authors: Colina
authors: Aránzazu
authors: A
authors: Heras
references: Anal Chem. 2012 Nov 6;84(21):9146-53
references: 23066989
references: Anal Bioanal Chem. 2005 May;382(1):12-21
references: 15900446
references: Anal Chem. 2012 Jul 3;84(13):5723-30
references: 22702449
references: Chem Rev. 2012 May 9;112(5):2739-79
references: 22295941
references: J Am Chem Soc. 2005 May 4;127(17):6146-7
references: 15853300
references: J Hazard Mater. 2012 Apr 30;213-214:161-6
references: 22365140
references: Anal Bioanal Chem. 2007 Jun;388(3):565-78
references: 17453176
references: Nanotechnology. 2009 Mar 11;20(10):105501
references: 19417520
references: Anal Bioanal Chem. 2006 Feb;384(3):601-19
references: 16402180
references: J Colloid Interface Sci. 2008 Jan 15;317(2):351-74
references: 18028940