Adsorption of water on alkoxy modified Si(100), Si(113) and Si (115) surfaces

Citation
A. Lopez et al., Adsorption of water on alkoxy modified Si(100), Si(113) and Si (115) surfaces, SURF SCI, 473(1-2), 2001, pp. 108-116
Citations number
14
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
00396028 → ACNP
Volume
473
Issue
1-2
Year of publication
2001
Pages
108 - 116
Database
ISI
SICI code
0039-6028(20010210)473:1-2<108:AOWOAM>2.0.ZU;2-2
Abstract
The passivation of Si(1 0 0), Si(1 1 3) and Si(1 1 5) with ethanol, isoprop anol and tert-butanol has been studied with high resolution electron energy loss spectroscopy (HREELS) and low electron energy diffraction (LEED). The HREEL spectra show clearly that the alcohols chemisorb dissociatively with the formation of a Si-O-C linkage on the three surfaces. We observe a cons iderable chemisorption of water on the ethoxy and tert-butoxy passivated Si (1 0 0)-2 x 1 surfaces. From the disappearance of the 2 x 1 LEED pattern, i t can be concluded that the chemisorption of water occurs through a cleavag e of the Si-Si dimer bond. In contrast, isopropoxy species on Si(1 0 0)-2 x 1 reduces dramatically the reactivity towards water. However, Si(1 1 3) an d Si(1 1 5) turn out to be much more reactive towards water molecules after the adsorption of any of the alcohols. (C) 2001 Elsevier Science B.V. All rights reserved.