The formation of ordered phases of dimethyl-disulfide on the Au(111) surface has been investigated by means of low-energy electron diffraction (LEED), X-ray photoemission spectroscopy (XPS), and state-of-the-art density-functional theory (DFT) periodic supercell calculations. The LEED diffraction pattern, obtained after a production method that includes two-step dosing and prolonged postdeposition annealing, unambiguously corresponds to a novel phase that consists of (3 x 4) domains coexisting with the as-deposited (root3 x root3)R30degrees structure. XPS measurements indicate that the coverage of the new (3 x 4) superstructure is the same as that of the (root3 x root3)R30degrees phase. In both phases, the binding energy of the S 2p(3/2) core-level peak is found to be 162.2 eV, corresponding to the formation of a thiolate layer. The DFT calculations allow us to identify a viable metastable (3 x 4) structure where the S headgroups of the CH3S radicals select distinct adsorption sites; three quarters of them adsorb at bridge sites and one quarter at top sites. The relative energetics of the (3 x 4) and (root3 x root3)R30degrees configurations suggest that the two structures may coexist on the surface, in agreement with experimental data.

Ordered (3 x 4) high-density phase of methylthiolate on Au(111) / DE RENZI, Valentina; R., Di Felice; Marchetto, Diego; Biagi, Roberto; DEL PENNINO, Umberto; A., Selloni. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - STAMPA. - 108:(2004), pp. 16-20.

Ordered (3 x 4) high-density phase of methylthiolate on Au(111)

DE RENZI, Valentina;MARCHETTO, Diego;BIAGI, Roberto;DEL PENNINO, Umberto;
2004

Abstract

The formation of ordered phases of dimethyl-disulfide on the Au(111) surface has been investigated by means of low-energy electron diffraction (LEED), X-ray photoemission spectroscopy (XPS), and state-of-the-art density-functional theory (DFT) periodic supercell calculations. The LEED diffraction pattern, obtained after a production method that includes two-step dosing and prolonged postdeposition annealing, unambiguously corresponds to a novel phase that consists of (3 x 4) domains coexisting with the as-deposited (root3 x root3)R30degrees structure. XPS measurements indicate that the coverage of the new (3 x 4) superstructure is the same as that of the (root3 x root3)R30degrees phase. In both phases, the binding energy of the S 2p(3/2) core-level peak is found to be 162.2 eV, corresponding to the formation of a thiolate layer. The DFT calculations allow us to identify a viable metastable (3 x 4) structure where the S headgroups of the CH3S radicals select distinct adsorption sites; three quarters of them adsorb at bridge sites and one quarter at top sites. The relative energetics of the (3 x 4) and (root3 x root3)R30degrees configurations suggest that the two structures may coexist on the surface, in agreement with experimental data.
108
16
20
Ordered (3 x 4) high-density phase of methylthiolate on Au(111) / DE RENZI, Valentina; R., Di Felice; Marchetto, Diego; Biagi, Roberto; DEL PENNINO, Umberto; A., Selloni. - In: JOURNAL OF PHYSICAL CHEMISTRY. B, CONDENSED MATTER, MATERIALS, SURFACES, INTERFACES & BIOPHYSICAL. - ISSN 1520-6106. - STAMPA. - 108:(2004), pp. 16-20.
DE RENZI, Valentina; R., Di Felice; Marchetto, Diego; Biagi, Roberto; DEL PENNINO, Umberto; A., Selloni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/306319
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