Spectroelectrochemical Study of the Photoinduced Catalytic Formation of 4,4′-Dimercaptoazobenzene from 4-Aminobenzenethiol Adsorbed on Nanostructured Copper
Por favor, use este identificador para citar o enlazar este ítem:
http://hdl.handle.net/10045/47293
Título: | Spectroelectrochemical Study of the Photoinduced Catalytic Formation of 4,4′-Dimercaptoazobenzene from 4-Aminobenzenethiol Adsorbed on Nanostructured Copper |
---|---|
Autor/es: | Vidal-Iglesias, Francisco J. | Solla-Gullón, José | Orts, José M. | Rodes, Antonio | Pérez Martínez, Juan Manuel |
Grupo/s de investigación o GITE: | Grupo de Espectroelectroquímica y Modelización (GEM) | Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | Surface-enhanced raman scattering (SERS) spectra | Photoinduced catalytic formation | 4,4′-dimercaptoazobenzene | 4-aminobenzenethiol | Nanostructured copper |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 12-may-2015 |
Editor: | American Chemical Society |
Cita bibliográfica: | The Journal of Physical Chemistry C. 2015, 119(22): 12312-12324. doi:10.1021/acs.jpcc.5b01245 |
Resumen: | Surface-enhanced raman scattering (SERS) spectra of self-assembled monolayers of 4-aminobenzenethiol (4-ABT) on copper (Cu) and silver (Ag) surfaces decorated with Cu and Ag nanostructures, respectively, have been obtained with lasers at 532, 632.8, 785, and 1064 nm. Density functional theory (DFT) has been used to obtain calculated vibrational frequencies of the 4-ABT and 4,4′-dimercaptoazobenzene (4,4′-DMAB) molecules adsorbed on model Cu surfaces. The features of the SERS spectra depend on the electrode potential and the type and power density of the laser. SERS spectra showed the formation of the 4,4′-DMAB on the nanostructured Cu surface independently of the laser employed. For the sake of comparison SERS spectra of a self-assembled monolayer of the 4-ABT on Ag surfaces decorated with Ag nanostructures have been also obtained with the same four lasers. When using the 532 and 632.8 nm lasers, the 4,4′-DMAB is formed on Cu surface at electrode potentials as low as −1.0 V (AgCl/Ag) showing a different behavior with respect to Ag (and others metals such as Au and Pt). On the other hand, the surface-enhanced infrared reflection absorption (SEIRA) spectra showed that in the absence of the laser excitation the 4,4′-DMAB is not produced from the adsorbed 4-ABT on nanostructured Cu in the whole range of potentials studied. These results point out the prevalence of the role of electron–hole pairs through surface plasmon activity to explain the obtained SERS spectra. |
Patrocinador/es: | Financial support from Ministerio de Economía y Competitividad (Projects CTQ2013-48280-C3-3-R and CTQ2013-44083-P), Fondos Feder, and the University of Alicante are greatly acknowledged. |
URI: | http://hdl.handle.net/10045/47293 |
ISSN: | 1932-7447 (Print) | 1932-7455 (Online) |
DOI: | 10.1021/acs.jpcc.5b01245 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2015 American Chemical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1021/acs.jpcc.5b01245 |
Aparece en las colecciones: | INV - EQSUP - Artículos de Revistas INV - LEQA - Artículos de Revistas INV - GEM - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
---|---|---|---|---|
2015_Vidal-Iglesias_etal_JPCC_final.pdf | Versión final (acceso restringido) | 7,71 MB | Adobe PDF | Abrir Solicitar una copia |
2015_Vidal-Iglesias_etal_JPCC_accepted.pdf | Accepted Manuscript (acceso abierto) | 4,28 MB | Adobe PDF | Abrir Vista previa |
Todos los documentos en RUA están protegidos por derechos de autor. Algunos derechos reservados.