Spectroelectrochemical Behaviour of 4-Aminobenzenethiol on Nanostructured Platinum and Silver Electrodes
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Título: | Spectroelectrochemical Behaviour of 4-Aminobenzenethiol on Nanostructured Platinum and Silver Electrodes |
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Autor/es: | Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Rodes, Antonio | Feliu, Juan M. | Pérez Martínez, Juan Manuel |
Grupo/s de investigación o GITE: | Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis | Grupo de Espectroelectroquímica y Modelización (GEM) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | SERS | SEIRAS | Aminobenzenethiol | Dimercaptoazobenzene | Pt nanoparticles | Ag nanoparticles |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 5-jun-2014 |
Editor: | Elsevier |
Cita bibliográfica: | Surface Science. 2014, Accepted Manuscript. doi:10.1016/j.susc.2014.05.023 |
Resumen: | 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. |
Patrocinador/es: | 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 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.susc.2014.05.023 |
Aparece en las colecciones: | INV - GEM - Artículos de Revistas INV - EQSUP - Artículos de Revistas INV - LEQA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2014_Vidal-Iglesias_etal_SurfaceScience.pdf | Accepted Manuscript (acceso abierto) | 1,41 MB | Adobe PDF | Abrir Vista previa |
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