Artículo
Stages of Se adsorption on Au(111): A combined XPS, LEED, TOF-DRS, and DFT study
Ruano Sandoval, Gustavo Daniel
; Tosi, Ezequiel
; Sánchez, Esteban Alejandro
; Abufager, Paula Natalia
; Martiarena, María Luz
; Grizzi, Oscar
; Zampieri, Guillermo Enrique
Fecha de publicación:
08/2017
Editorial:
Elsevier Science
Revista:
Surface Science
ISSN:
0039-6028
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have studied the adsorption of Se on the surface Au(111) using XPS, TOF-DRS, LEED and DFT calculations. The use of a doser that operates in vacuum allowed us to investigate all the stages of the adsorption from the clean surface up to the formation of multilayers. In the monolayer regime we have found two ordered phases with distinctive LEED patterns. The LEED pattern of the first phase presents three fractional spots arranged symmetrically around the positions of the spots in a √3x√3 pattern. The analysis of this pattern suggests the formation of either a nxn superstructure of √3x√3 domains with n=19 or n=22, or that the adsorption occurs without removing the 22x√3 herringbone reconstruction of the gold surface. This last possibility is in accordance with DFT calculations which show that the charge transfer to a Se adsorbate might not be enough to destabilize the surface reconstruction. Increasing the coverage, beyond 0.3 ML a new LEED pattern appears with broad spots which upon annealing at 150 °C become well defined indicating a 1×8 periodicity. At the highest doses we have observed the formation of multilayers with no discernible LEED pattern. The comparison with adsorption experiments carried out in liquid solutions show similarities and also some important differences.
Palabras clave:
Se
,
Au(111)
,
Adsorption
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos de INST.DE FISICA DE ROSARIO (I)
Articulos(IFIS - LITORAL)
Articulos de INST.DE FISICA DEL LITORAL
Articulos de INST.DE FISICA DEL LITORAL
Citación
Ruano Sandoval, Gustavo Daniel; Tosi, Ezequiel; Sánchez, Esteban Alejandro; Abufager, Paula Natalia; Martiarena, María Luz; et al.; Stages of Se adsorption on Au(111): A combined XPS, LEED, TOF-DRS, and DFT study; Elsevier Science; Surface Science; 662; 8-2017; 113-122
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