Journal
SURFACE SCIENCE
Volume 601, Issue 14, Pages 3125-3132Publisher
ELSEVIER
DOI: 10.1016/j.susc.2007.05.033
Keywords
angle-resolved photoemission spectroscopy; copper; zinc oxide; water; oxidation
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Oxidation of Cu clusters on the ZnO(1010) surfaces has been examined by angle-resolved photoemission spectroscopy (ARPES) utilizing synchrotron radiation. Cu deposition on ZnO(1010) leads to the formation of the Cu clusters with a metallic electronic structure. Partial oxidation of the cluster is induced by annealing the Cu-covered ZnO(1010) surface at temperatures higher than 700 K. Oxidation proceeds via interaction of the Cu adatoms with the O atoms which are migrated from the substrate bulk to the surface due to the thermal activation. The Cu adatoms also aggregate into clusters when they are dosed on the water-preadsorbed ZnO(1010) surface at room temperature. These clusters are found to be partially oxidized. The detection-angle dependent measurements of the ARPES spectra of the Cu clusters on the water-preadsorbed surface reveal that oxidized Cu exists on the Cu-cluster surface, i.e. the Cu cluster capped with the oxidized species is induced. (C) 2007 Elsevier B.V. All rights reserved.
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