期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 25, 页码 12299-12307出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp202165u
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资金
- Division of Materials Science and Engineering, Basic Energy Sciences, U.S. Department of Energy [DE-FG02-09ER46558]
- JHU Department of Chemistry
Mass-selected, cluster anion beams of Mo-100 +/- 2.5(-) and (MoO3)(67 +/- 1.5)(-) were prepared with a magnetron source and soft-landed onto highly ordered pyrolytic graphite (HOPG) under UHV conditions. These two clusters were selected because they possess essentially the same masses and consequently could be soft-landed with the same low kinetic energies. The chemical composition of the deposited clusters was analyzed using in situ Auger electron spectroscopy and ex situ X-ray photoelectron spectroscopy, while their surface morphologies were characterized with in situ scanning tunneling microscopy (STM) and ex situ atomic force microscopy (AFM) Both STM and AFM results indicated a high mobility for the metal atom clusters on HOPG at room temperature. At low coverages, Mo-100 +/- 2.5 clusters nucleated preferentially at step-edges. As their coverage increased, cluster aggregates formed on the terraces until a fully saturated overlayer was created. By contrast, deposited metal oxide clusters produced a stochastic array of adsorbed clusters for all coverages. Differences in the behavior of deposited Mo-100 +/- 2.5 and (MoO3)(67 +/- 1.5) clusters were interpreted in terms of differences in the interactions of metal and metal oxide clusters with carbonaceous substrates.
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