Selenium adsorption on Au(111) and Ag(111) surfaces: adsorbed selenium and selenide films

Jia, Juanjuan and Bendounan, Azzedine and Kotresh, Harish Makri Nimbegondi and Chaouchi, Karine and Sirotti, Fausto and Sampath, Srinivasan and Esaulov, Vladimir A (2013) Selenium adsorption on Au(111) and Ag(111) surfaces: adsorbed selenium and selenide films. In: Journal of Physical Chemistry C, 117 (19). pp. 9835-9842.

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Abstract

Results of a high resolution photoemission and electrochemistry study of Se adsorption Au(111) and Ag(111) surfaces performed by immersion of pristine samples into an aqeuous solution of Na2Se are presented. Cyclic voltammetry on Au shows formation of selenium adsorbed species and the structures observed in reductive desorption are to the atomic and polymeric species observed in XPS. In the case of Au(111) XPS spectra in the Se(3d) region indeed show two main features attributed to Se chemisorbed atomically and polymeric Se-8 features.' Smaller structures due to other types of Se conformations were also observed. The Au(4f) peak line, shape does not show core level, shifts: indicative of Au selenide formation the case of silver, XPS spectra for the Ag(3d) show a broadening of the peak and a deconvolution into Ag-B bulk like Ag-Se components shows that the Ag-Se is located at a lower binding energy, an effect similar to oxidation and sulfidation of Ag. The Se(3d) XPS spectrum is found to be substantially different from the Au case and dominated by atomic type Se due to the selenide, though a smaller intensity Se structure at an energy similar to the Se-8 structure for Au is also observed. Changes in the valence band region. related to Se adsorption are reported.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Aug 2013 11:32
Last Modified:	06 Aug 2013 11:32
URI:	http://eprints.iisc.ac.in/id/eprint/46915

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