Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 21, Pages 11211-11218Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp402008w
Keywords
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Funding
- National Energy Technology Laboratory's ongoing research under the RES contract [DE-FE0004000]
- National Natural Science Foundation of China [21173210, 21103165, 21225315]
- 973 Project [2013CB834603]
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The stoichiometric single- and bilayer ZnO(0001) have been prepared by reactive deposition of Zn on Au(111) and studied in detail with X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory calculations. Both single- and bilayer ZnO(0001) adopt a planar, graphite-like structure similar to freestanding ZnO(0001) due to the weak van der Waals interactions dominating their adhesion with the Au(111) substrate. At higher temperature, the single-layer ZnO(0001) converts gradually to bilayer ZnO(0001) due to the twice stronger interaction between two ZnO layers than the interfacial adhesion of ZnO with Au substrate. It is found that Cu atoms on the surface of bilayer ZnO(0001) are mobile with a diffusion barrier of 0.31 eV and likely to agglomerate and form nanosized particles at low coverages; while Cu atoms tend to penetrate a single layer of ZnO(0001) with a barrier of 0.10 eV, resulting in a Cu free surface.
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