Chemical properties of Zn on Ru(001): Coadsorption with Cs, O, Cu, and Au

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.579105· OSTI ID:7084517

Rodriguez, J A; Hrbek, J ^[1]

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1. Chemistry Department, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000 (United States)

The coadsorption of Zn with Cs (an electropositive species) or O [sup [minus]](an electronegative species) on Ru(001) does not induce significant changes in the thermal stability of the Ru--Zn bond. On the other hand, two-dimensional CuZn (or AuZn) alloys in contact with Ru(001) show Ru--Zn and Zn--noble metal bonds more stable than the corresponding bonds in Zn/Ru(001) and thick CuZn (or AuZn) alloys. This phenomenon is caused by synergistic interactions in three-center metal--metal bonding. Photoemission studies indicate that at submonolayer coverages of Zn and O there is no lateral bonding between these species on Ru(001). The formation of ZnO[sub [ital x]] films on Ru(001) occurs when the Zn and O coverages are higher than 1 ML. On Zn films supported on Ru(001), the initial adsorption probability of O[sub 2] is extremely low, and O[sub 2] exposures in the range of 10[sup 3]--10[sup 4] L are necessary to produce a significant transformation of metallic Zn into ZnO. The presence of Cs enhances the oxidation rate of Zn by 2--3 orders of magnitude. In the Cs/Zn/Ru(001) systems, the alkali adatoms adsorb and dissociate O[sub 2] molecules, producing a reservoir of oxygen species that react with Zn.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7084517
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 12:4; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
CESIUM
CHEMICAL BONDS
COPPER
ELECTRONIC STRUCTURE
ELEMENTS
FILMS
GOLD
METALS
NONMETALS
OXYGEN
PLATINUM METALS
RUTHENIUM
SORPTION
SORPTIVE PROPERTIES
STABILITY
SURFACE PROPERTIES
TRANSITION ELEMENTS
ZINC