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Search for the Structure of a Sulfur-Induced Reconstruction on Cu(111)

TitleSearch for the Structure of a Sulfur-Induced Reconstruction on Cu(111)
Publication TypeJournal Article
Year of Publication2014
AuthorsLiu, DJ, Walen, H, Oh, J, Lim, H, Evans, JW, Kim, Y, Thiel, PA
JournalJournal of Physical Chemistry C
Volume118
Pagination29218-29223
Date Published12
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberWOS:000346759300033
Keywordschemisorption, oxygen, scanning tunneling microscope
Abstract

We have carried out an extensive DFT-based search for the structure of the (root 43 x root 43)R +/- 7.5 degrees reconstruction of S on Cu(111), which exhibits a honeycomb-type structure in scanning tunneling microscopy (STM). We apply two criteria in this search: The structure must have a reasonably low chemical potential, and it must provide a good match with STM data, both our own and the data published by Wahlstrom et al. Phys. Rev. B 1999, 60, 10699. The best model has 12 S adatoms and 9 Cu adatoms per unit cell. Local defects within the Cu9S12 framework, consisting of one missing or one extra Cu adatom per unit cell, would be difficult to detect with STM and would not be energetically costly. There is no obvious correlation between this model and the structure of bulk CuS. If the root 43 reconstruction is viewed in terms of local building blocks, then CuS3 and CuS2 clusters, linked by shared S atoms, provides the best description.

DOI10.1021/jp505351g
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Chemical Physics

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NSF