High sintering resistance of size-selected platinum cluster catalysts by suppressed ostwald ripening

Kristina Wettergren, Florian F. Schweinberger, Davide Deiana, Claron J. Ridge, Andrew S. Crampton, Marian D. Rötzer, Thomas W. Hansen, Vladimir P. Zhdanov, Ueli Heiz, Christoph Langhammer

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

Employing rationally designed model systems with precise atom-by-atom particle size control, we demonstrate by means of combining noninvasive in situ indirect nanoplasmonic sensing and ex situ scanning transmission electron microscopy that monomodal size-selected platinum cluster catalysts on different supports exhibit remarkable intrinsic sintering resistance even under reaction conditions. The observed stability is related to suppression of Ostwald ripening by elimination of its main driving force via size-selection. This study thus constitutes a general blueprint for the rational design of sintering resistant catalyst systems and for efficient experimental strategies to determine sintering mechanisms. Moreover, this is the first systematic experimental investigation of sintering processes in nanoparticle systems with an initially perfectly monomodal size distribution under ambient conditions.

Original languageEnglish
Pages (from-to)5803-5809
Number of pages7
JournalNano Letters
Volume14
Issue number10
DOIs
StatePublished - 8 Oct 2014
Externally publishedYes

Keywords

  • Ostwald ripening
  • Size-selected clusters
  • indirect nanoplasmonic sensing
  • platinum
  • sintering resistance

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