MRS Proceedings

Table of Contents - Volume  272  - Symposium O – Chemical Processes in Inorganic Materials: Metal and Semiconductor Clusters  

Editors : John S. Bradley, R.R. Chianelli, Peter D. Persans, Gunter Schmid

Articles

Preparation, Structure and Properties of Novel Bimetallic Au/Pd Colloids

1992 MRS Spring Meeting.

Christopher J. Baddeleya1, David A. Jeffersona1, Richard M. Lamberta1, R. Mark Ormeroda1, Trevor Raymenta1, Günter Schmida2 and Andrew P. Walkera1

a1 Department of Chemistry, University of Cambridge, Cambridge CB2 lEW, UK

a2 Institut für Anorganische Chemie, Universität-GH Essen, 4300 Essen 1, Germany

ABSTRACT

Ligand-stabilized bimetallic Au/Pd colloids may be prepared from 180–200Å Au colloids which can be covered by Pd shells of varying thickness. They can be isolated as solid materials without agglomeration. HREM observations indicate a narrow particle size distribution and reveal a well-defined Au(core)/Pd(shell) structure. This is convincingly confirmed by EXAFS data. Thermal treatment leads to Au/Pd alloy formation at ≥ 500 K, as evidenced by the appearance of characteristic Au-Pd distances in the EXAFS.

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