Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface

We have studied the adsorption of reduced sulfur species on the Au(001)-hex surface from diluted ethanolic sulfide solutions by STM, XPS, electrochemical techniques, and DFT calculations. Our results reveal the absence of S multilayers because all S species are bonded to Au surface atoms. Monomeric...

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Detalles Bibliográficos
Autores principales: Maza, Flavia Emilia Lobo, Carro, Pilar, Vericat, Carolina, Kern, Klaus, Salvarezza, Roberto Carlos, Grumelli, Doris Elda
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Química
Adsorption
Chemical structure
Gold
Lattices
Scanning tunneling microscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/137742
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-137742
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Adsorption
Chemical structure
Gold
Lattices
Scanning tunneling microscopy
spellingShingle Química
Adsorption
Chemical structure
Gold
Lattices
Scanning tunneling microscopy
Maza, Flavia Emilia Lobo
Carro, Pilar
Vericat, Carolina
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
topic_facet Química
Adsorption
Chemical structure
Gold
Lattices
Scanning tunneling microscopy
description We have studied the adsorption of reduced sulfur species on the Au(001)-hex surface from diluted ethanolic sulfide solutions by STM, XPS, electrochemical techniques, and DFT calculations. Our results reveal the absence of S multilayers because all S species are bonded to Au surface atoms. Monomeric S adsorbs at hollow sites forming a (2 × 2) lattice, while S2 species either capture the gold adatoms (Auad) that result from the hex lifting or remove Auad from the substrate forming well-ordered S8-like structures. These are formed by four S2 species coordinated by a central Auad, with AuSS interatomic distances closely resembling those of a metal disulfide. Our results explain not only the predominant surface structures on the gold surface but also topographic features, like Auad islands and Au vacancy islands, and also the chemical nature of adsorbed species from XPS S 2p spectra. In contrast to the S heads of small aromatic thiols, which exhibit a low affinity for Auad, strongly reactive sulfide species react with the metal adatoms leading to well-ordered complexes.
format Articulo
Preprint
author Maza, Flavia Emilia Lobo
Carro, Pilar
Vericat, Carolina
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
author_facet Maza, Flavia Emilia Lobo
Carro, Pilar
Vericat, Carolina
Kern, Klaus
Salvarezza, Roberto Carlos
Grumelli, Doris Elda
author_sort Maza, Flavia Emilia Lobo
title Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
title_short Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
title_full Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
title_fullStr Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
title_full_unstemmed Role of Gold Adatoms in the Adsorption of Sulfide Species on the Gold(001)-hex Surface
title_sort role of gold adatoms in the adsorption of sulfide species on the gold(001)-hex surface
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/137742
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