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Structural investigation of the interaction of molecular sulfur with Ag(111)
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Yu, Miao, Woodruff, D. P., Satterley, Christopher J., Jones, Robert G. and Dhanak, V. R. (2007) Structural investigation of the interaction of molecular sulfur with Ag(111). Journal of Physical Chemistry C, Vol.111 (No.7). pp. 3152-3162. doi:10.1021/jp067132k ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp067132K
Abstract
Scanning tunneling microscopy (STM) and normal-incidence X-ray standing wave (NIXSW) analysis, together with low-energy electron diffraction (LEED) and X-ray photoelectron spectroscopy (XPS), have been used to investigate the structure of surface phases formed by the dissociation of molecular sulfur (S-2) on Ag(111) under ultrahigh vacuum conditions. Both a complex low coverage phase and the well-known Ag(111)(root 7 x root 7)R19 degrees-S surface have been investigated. In the case of the low coverage phase, the long-range periodicity seen in STM and the LEED pattern have been reconciled, while NIXSW data indicate a significant local coherence of the S atoms on the substrate. However, the complexity of this phase, with a minimum estimate of I I S atoms per unit mesh, is too great for complete structural interpretation. A model for the (root 7 x root 7)R19 degrees-S phase, based on epitaxial growth of the high-temperature fec phase of Ag2S(111), is found to be consistent with all the experimental data, while NIXSW provides information on the nature of the Ag(111)/Ag2S(111) interface. In particular, this interface is proposed to involve S atoms in sites between the outermost unreconstructed Ag(111) surface and a 3/7 ML reconstructed Ag layer with the same periodicity as in the Ag2S overlayer above. Some issues concerning the nature of the atomic-scale STM imaging, and the relationship to electrochemical studies of this interface, are discussed.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Journal of Physical Chemistry C | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 1932-7447 | ||||
| Official Date: | 22 February 2007 | ||||
| Dates: |
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| Volume: | Vol.111 | ||||
| Number: | No.7 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 3152-3162 | ||||
| DOI: | 10.1021/jp067132k | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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