Artículo
Sulfidization of Au(111) from thioacetic acid: An experimental and theoretical study
Fischer, Jeison A.; Zoldan, Vinícius C.; Benitez, Guillermo Alfredo
; Rubert, Aldo Alberto
; Ramirez, Eduardo Alejandro
; Carro, Pilar; Salvarezza, Roberto Carlos
; Pasa, André A.; Vela, Maria Elena
Fecha de publicación:
24/09/2012
Editorial:
American Chemical Society
Revista:
Langmuir
ISSN:
0743-7463
e-ISSN:
1520-5827
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have studied the adsorption of thioacetic acid (TAAH) on Au(111) from solution deposition. The close proximity of the SH groups to CO groups makes this molecule very attractive for exploring the effect of the functional group on the stability of the S-C and S-Au bonds. Although thioacetic acid was supposed to decompose slowly in water by hydrolysis supplying hydrogen sulfide, this behavior is not expected in nonpolar solvents such as toluene or hexane. Therefore, we have used these solvents for TAAH selfassembly on the Au(111) surface. The characterization of the adsorbates has been done by electrochemical techniques, X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). We have found that even in nonpolar solvents thioacetic acid decomposes to S. The results have been discussed on the basis that the adsorbed species suffer a cleavage on the Au surface, leaving the S attached to it. The dissociation is a spontaneous process that reaches the final state very fast once it is energetically favorable, as can be interpreted from DFT calculations. The thioacetic acid adsorption reveals the strong effect that produces a functional group and the key role of the S-H bond cleavage in the self-assembly process.
Palabras clave:
THIOACETIC ACID
,
GOLD
,
XPS
,
STM
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Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Fischer, Jeison A.; Zoldan, Vinícius C.; Benitez, Guillermo Alfredo; Rubert, Aldo Alberto; Ramirez, Eduardo Alejandro; et al.; Sulfidization of Au(111) from thioacetic acid: An experimental and theoretical study; American Chemical Society; Langmuir; 28; 43; 24-9-2012; 15278-15285
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