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Surface morphologies of size-selected Mo100±2.5 and (MoO3)67±1.5 clusters soft-landed onto HOPG

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2011

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Wepasnick, Kevin A.
Li, X.
Noessner, Stephan
Wolke, C.
Grossmann, M.
Fairbrother, D. Howard
Bowen, Kit H.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-191844
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https://doi.org/10.1021/jp202165u
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The Journal of Physical Chemistry C. 2011, 115(25), pp. 12299-12307. ISSN 1932-7447. Available under: doi: 10.1021/jp202165u

Zusammenfassung

Mass-selected, cluster anion beams of Mo100±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, Mo100±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 Mo100±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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ISO 690WEPASNICK, Kevin A., X. LI, Tobias Stefan MANGLER, Stephan NOESSNER, C. WOLKE, M. GROSSMANN, Gerd GANTEFÖR, D. Howard FAIRBROTHER, Kit H. BOWEN, 2011. Surface morphologies of size-selected Mo100±2.5 and (MoO3)67±1.5 clusters soft-landed onto HOPG. In: The Journal of Physical Chemistry C. 2011, 115(25), pp. 12299-12307. ISSN 1932-7447. Available under: doi: 10.1021/jp202165u
BibTex
@article{Wepasnick2011Surfa-19184,
  year={2011},
  doi={10.1021/jp202165u},
  title={Surface morphologies of size-selected Mo<sub>100±2.5</sub> and (MoO<sub>3</sub>)<sub>67±1.5</sub> clusters soft-landed onto HOPG},
  number={25},
  volume={115},
  issn={1932-7447},
  journal={The Journal of Physical Chemistry C},
  pages={12299--12307},
  author={Wepasnick, Kevin A. and Li, X. and Mangler, Tobias Stefan and Noessner, Stephan and Wolke, C. and Grossmann, M. and Ganteför, Gerd and Fairbrother, D. Howard and Bowen, Kit H.}
}
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