The structure of AuPd nanoalloys anchored on spherical polyelectrolyte brushes determined by X-ray absorption spectroscopy

Well-defined and facetted bimetallic goldpalladium nanoalloys have been synthesized and anchored in spherical polyelectrolyte brushes (SPB) as composite particles (AuPd@SPB). These particles are better catalysts in aqueous phase than the pure metals. The atomistic arrangement of these nanoalloys has...

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Bibliographic Details
Published in:Faraday discussions 2013-01, Vol.162, p.45-55
Main Authors: Kaiser, Julian, Szczerba, Wojciech, Riesemeier, Heinrich, Reinholz, Uwe, Radtke, Martin, Albrecht, Martin, Lu, Yan, Ballauff, Matthias
Format: Article
Language:English
Subjects:
Alloys
Brushes
Gold
Nanostructure
Palladium
Particulate composites
Polyelectrolytes
X-rays
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Summary:Well-defined and facetted bimetallic goldpalladium nanoalloys have been synthesized and anchored in spherical polyelectrolyte brushes (SPB) as composite particles (AuPd@SPB). These particles are better catalysts in aqueous phase than the pure metals. The atomistic arrangement of these nanoalloys has been analysed by extended X-ray absorption fine structure (EXAFS) spectroscopy at the AuL 3 and the PdK absorption edge. The samples with high amounts of gold appear as almost statistically mixed random alloys. Alloy compositions with less gold show slight enrichment of Pd at the surface of the particle. In addition, signals of non-metallic palladium appear at the PdK edge which indicate the presence of the Pd 2+ species in addition to metallic palladium. The relation of these structural features to the catalytic activity is discussed.
ISSN:1359-6640
1364-5498
DOI:10.1039/c3fd20132e