Journal
CHEMICAL PHYSICS
Volume 359, Issue 1-3, Pages 161-165Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2009.03.023
Keywords
Au; Cluster; Oxidation; X-ray photoelectron spectroscopy
Funding
- Deutsche Forschungsgemeinschaft [SFB 513]
- Korean Government [KRF-2006-000-C00003]
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Au cluster anions consisting of 2-13 atoms were soft-landed on native-oxide-covered Si wafers. Reaction of soft-landed clusters with an atomic oxygen atmosphere was studied using X-ray photoelectron spectroscopy (XPS). Au-5, Au-7, and Au-13 turned out to show pronounced inertness for Au-oxide formation. When the samples with deposited Au clusters were treated with aqueous NaOH, the inert Au-5, Au-7, and Au-13 clusters became reactive towards Au-oxide formation, whereas the other originally reactive clusters became inert. This result can be interpreted in terms of electronic modification of Au clusters by Na, which was also evidenced by Au 4f and Na 1s core level shifts. (C) 2009 Elsevier B.V. All rights reserved,
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