The chemisorption of CO on Cu films on ZnO(0001)-O

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1148· OSTI ID:6251530

Ludviksson, A; Ernst, K H; Zhang, R; Campbell, C T ^[1]

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1. Univ. of Washington, Seattle (United States)

The adsorption of CO on Cu films grown on the oxygen-terminated ZnO(0001)-O surface has been studied with temperature-programmed desorption (TPD) and XPS. At 130K, submonolayer Cu films can be grown which cover about 50% of the surface in two-dimensional islands, in intimate contact with the ZnO. These films adsorb CO very much like the Cu(110) surface, producing strong satellite structure in the C(1s) and O(1s) spectra, and CO TPD spectra dominated by a peak at 220 K. These results imply that this 2D Cu is metallic in character, consistent with earlier measurements of its electronic properties. An explanation for the lack of evidence for CO adsorption by submonolayer Cu in an earlier study is offered. Multilayer Cu films, or submonolayer films which have been forced to form thicker, smaller islands by annealing at high temperatures, show CO TPD spectra with a strong peak at [approximately]160 K, characteristic of Cu(111)-like sites, consistent with earlier LEED and ARXPS results. The loss in CO adsorption capacity of submonolayer Cu films caused by annealing is not as great as the loss in Cu surface area measured by He[sup [minus]] ion scattering spectra. This is interpreted in terms of a CO-induced redispersion of 3D Cu clusters into 2D islands. 25 refs., 6 figs.

• OSTI ID: 6251530
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 141:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANNEALING
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
FILMS
HEAT TREATMENTS
ION SCATTERING ANALYSIS
METALS
MILLER INDICES
NONDESTRUCTIVE ANALYSIS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE AREA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES