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High Sintering Resistance of Size-Selected Platinum Cluster Catalysts by Suppressed Ostwald Ripening

Kristina Wettergren (Institutionen för teknisk fysik, Kemisk fysik) ; F. F. Schweinberger ; D. Deiana ; C. J. Ridge ; A. S. Crampton ; M. D. Rotzer ; T. W. Hansen ; V. P. Zhdanov ; U. Heiz ; Christoph Langhammer (Institutionen för teknisk fysik, Kemisk fysik)
Nano Letters (1530-6984). Vol. 14 (2014), 10, p. 5803-5809.
[Artikel, refereegranskad vetenskaplig]

Employing rationally designed model systems with precise atom-by-atom particle size control, we demonstrate by means of combining noninvasive in situ indirect nano-plasmonic 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 Oftwald 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.

Nyckelord: Size-selected clusters, indirect nanoplasmonic sensing, sintering, sintering resistance, Ostwald ripening; platinum



Denna post skapades 2014-11-18.
CPL Pubid: 205946

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

Ämnesområden

Annan fysik
Nanoteknik

Chalmers infrastruktur