Rich coordination chemistry of Au adatoms in gold sulfide monolayer on Au(111)

Quek, Su Ying ; Biener, Monika M. ; Biener, Juergen ; Bhattacharjee, Joydeep ; Friend, Cynthia M. ; Waghmare, Umesh V. ; Kaxiras, Efthimios (2006) Rich coordination chemistry of Au adatoms in gold sulfide monolayer on Au(111) Journal of Physical Chemistry B, 110 (32). pp. 15663-15665. ISSN 1520-6106

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp0641379

Related URL: http://dx.doi.org/10.1021/jp0641379

Abstract

The rich chemistry of Au nanoparticles and ions has attracted tremendous interest, in part because the surfaces of bulk Au have traditionally been considered to be chemically inert. On the other hand, large-scale mass transport and the formation of vacancy islands have been observed on the Au(111) surface following the deposition of adsorbates, such as sulfur and thiols, that can interact strongly with the Au surface. In this work, we revisit the structure and chemistry of an ordered incommensurate AuS adlayer that forms on Au(111) following the deposition of sulfur and annealing to 450 K. A structural model of this AuS surface phase has not yet been determined experimentally due to the complexity of the system. Here, we use state-of-the-art density functional theory to develop an atomic-scale model that is consistent with the previously reported Au-S stoichiometry. In particular, we introduce theoretical techniques to take into account the charge transfer in an incommensurate system. Our model reproduces convincingly STM images and is remarkably robust. Bonding analysis based on Wannier functions shows that the model exhibits rich coordination chemistry corresponding to different Au oxidation states. The extraordinary stability and rich chemistry of this structure have implications for related S-Au interfaces and previously reported surface features of this system.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:59400
Deposited On:06 Sep 2011 05:29
Last Modified:06 Sep 2011 05:29

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