Spectroelectrochemical Behaviour of 4-Aminobenzenethiol on Nanostructured Platinum and Silver Electrodes

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Title: Spectroelectrochemical Behaviour of 4-Aminobenzenethiol on Nanostructured Platinum and Silver Electrodes
Authors: Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Rodes, Antonio | Feliu, Juan M. | Pérez Martínez, Juan Manuel
Research Group/s: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis | Grupo de Espectroelectroquímica y Modelización (GEM)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: SERS | SEIRAS | Aminobenzenethiol | Dimercaptoazobenzene | Pt nanoparticles | Ag nanoparticles
Knowledge Area: Química Física
Issue Date: 5-Jun-2014
Publisher: Elsevier
Citation: Surface Science. 2014, Accepted Manuscript. doi:10.1016/j.susc.2014.05.023
Abstract: The adsorption of 4-aminobenzenethiol (4-ABT) on Ag and Pt nanoparticles is studied by spectroelectrochemical means (cyclic voltammetry, Surface-Enhanced Raman Spectroscopy (SERS) and Surface-Enhanced Infrared Reflection Absorption Spectroscopy (SEIRAS). Similar SERS spectra are obtained when 4-ABT is adsorbed on platinum and silver nanostructured substrates. In addition, unless a low power density of the laser is used, these spectra show, both under open circuit conditions and when applying electrode potentials above -0.50 V, bands not observed in the normal Raman spectrum of 4-ABT. These bands disappear when the electrode potential is shifted to more negative values. Conversely, the SEIRA spectra of 4-ABT adsorbed on Ag do not show any significant change with the electrode potential, which indicates that there are not new species electrochemically formed in the range of potentials considered, which include some anodic and cathodic processes as shown in the corresponding cyclic voltammograms. In this regard, SERS measurements put in evidence the time dependence of the spectra obtained at potentials above -0.50 V just after switching on the laser suggesting the formation of new species, probably dimercaptoazobenzene (4-4’-DMAB), formed by a photochemical process of the adsorbed 4-ABT.
Sponsor: Financial support from Ministerio de Ciencia e Innovación (projects CTQ2010-16271, CTQ2009-13142, and Fondos Feder), Generalitat Valenciana (Prometeo/2009/045 and ACOMP/2011/200), and University of Alicante is greatly acknowledged.
URI: http://hdl.handle.net/10045/37963
ISSN: 0039-6028 (Print) | 1879-2758 (Online)
DOI: 10.1016/j.susc.2014.05.023
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.susc.2014.05.023
Appears in Collections:INV - GEM - Artículos de Revistas
INV - EQSUP - Artículos de Revistas
INV - LEQA - Artículos de Revistas

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