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Synthesis of monodispersed model catalysts using softlanding cluster deposition

Abbet, Stéphane ; Judai, Ken ; Klinger, Laurent ; Heiz, Ueli

In: Pure and Applied Chemistry, 2002, vol. 74, no. 9, p. 1527-1535

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    Titre
    • Synthesis of monodispersed model catalysts using softlanding cluster deposition
    Auteur
    • Abbet, Stéphane. University of Ulm, Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, 89069 Ulm, Germany
    • Judai, Ken. University of Ulm, Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, 89069 Ulm, Germany
    • Klinger, Laurent. Ecole Polytechnique Fédérale de Lausanne, CRPP, 1015 Lausanne, Switzerland
    • Heiz, Ueli. University of Ulm, Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, 89069 Ulm, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Pure and Applied Chemistry, 2002, vol. 74, no. 9, p. 1527-1535. De Gruyter
    Autre version électronique
    Classification
    • Santé
    Identifiant OAI-PMH
    • oai:doc.rero.ch:304661
    Summary
    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