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

Journal Article · Fri Jul 01 00:00:00 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), Vol. 12:4; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

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