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A “Cluster-in-Cluster” Structure of the SiO 2 -Supported PtPd Clusters

1993; Institute of Physics; Volume: 32; Issue: S2 Linguagem: Inglês

10.7567/jjaps.32s2.448

1347-4065

Kiyotaka Asakura, Y. Yamazaki, Haruo Kuroda, Masafumi Harada, Naoki Toshima,

Iron oxide chemistry and applications

The structures of SiO 2 -supported PtPd alloy clusters with the size of about 20 Å which were prepared from the PtPd colloid solutions were investigated by means of EXAFS. The phase shift and amplitude functions were derived from PtPd foils with the atomic ratio of 1:9, 1:1 and 9:1. The curve fitting analyses showed that the PtPd clusters were present in a “cluster-in-cluster” structure in which the homogeneous clusters were composed of several smaller clusters composed of the atoms of each metal.