Synthesis of monodispersed model catalysts using softlanding cluster deposition

Stéphane Abbet, Ken Judai, Laurent Klinger, Ueli Heiz

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

In nanocatalysis, clusters deposited on solid, well-defined surfaces play an important role. For the detection of size effects it is, however, important to prepare samples consisting of deposited clusters of a single size, as their chemical properties change with the exact number of atoms in the cluster. In this paper, the experimental tools are presented to prepare such model systems. The existence of monodispersed clusters is confirmed by various experimental findings. First, the carbonyl formation of deposited Nin clusters shows no change in the nuclearity when comparing the size of the deposited clusters with one of the formed carbonyls. Second, scanning tunneling microscopy (STM) studies show that fragmentation of Sin clusters upon deposition can be excluded. In addition, the adsorption behavior of CO on deposited Pd atoms points to the existence of single atoms on the surface. Furthermore, CO oxidation results on Aun clusters confirm the existence of monodispersed clusters trapped on well-defined adsorption sites. Finally, we use Monte-Carlo simulations to define the range of clusters and defect densities, for which monodispersed clusters can be expected.

Original languageEnglish
Pages (from-to)1527-1535
Number of pages9
JournalPure and Applied Chemistry
Volume74
Issue number9
DOIs
StatePublished - 1 Sep 2002
Externally publishedYes

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