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Sulphur overlayers on the Au(110) surface: LEED and TPD study

Krasnikov, Sergey A. and Hughes, Greg and Cafolla, Attilio A. (2007) Sulphur overlayers on the Au(110) surface: LEED and TPD study. Surface Science, 601 (16). pp. 3506-3511. ISSN 0039-6028

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Abstract

The adsorption and desorption of sulphur on the clean reconstructed Au(1 1 0)–(1 × 2) surface has been studied by low energy electron diffraction, Auger electron spectroscopy and temperature programmed desorption. The results obtained show a complex behaviour of the S/Au(1 1 0) system during sulphur desorption at different temperatures. Two structures of the stable ordered sulphur overlayer on the Au(1 1 0) surface, p(4 × 2) and c(4 × 4), were found after annealing the S/Au(1 1 0) system at 630 K and 463 K, respectively. The corresponding sulphur coverage for these overlayers was estimated by AES signal intensity analysis of the Au NOO and S LMM Auger lines to be equal to 0.13 ML and 0.2 ML, respectively. Both sulphur structures appear after removing an excess of sulphur, which mainly desorbs at 358 K as determined from TPD spectra. Furthermore, it was not possible to produce the lower coverage p(4 × 2) sulphur structure by annealing the c(4 × 4) surface. In the case of the p(4 × 2) S overlayer on the Au(1 1 0)–(1 × 2) surface it is proposed that the sulphur is attached to “missing row” sites only. The c(4 × 4) S overlayer arises via desorption of S2 molecules that are formed on the surface due to mobility of sulphur atoms after a prolonged anneal.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Au(110); sulphur overlayers; LEED; TPD; Auger electron spectroscopy;
Subjects:Physical Sciences > Spectrum analysis
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.susc.2007.06.064
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:101
Deposited On:13 Nov 2007 by DORAS Administrator. Last Modified 30 Jan 2009 15:13

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