Compositional changes of Pd-Au bimetallic nanoclusters upon hydrogenation

被引：28
作者：
Di Vece, M. [1 ,2 ]
Bals, S. [3 ]
Verbeeck, J. [3 ]
Lievens, P. [1 ,2 ]
Van Tendeloo, G. [3 ]
机构：
[1] Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, B-3001 Heverlee, Belgium
[2] Katholieke Univ Leuven, Inst Nanoscale Phys & Chem, B-3001 Heverlee, Belgium
[3] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 12期
关键词：
LASER VAPORIZATION SOURCE; CATALYTIC-ACTIVITY; CLUSTERS; NANOPARTICLES; SIZE; GOLD;
D O I：
10.1103/PhysRevB.80.125420
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Changes in the size distribution and composition of bimetallic Pd-Au nanoclusters have been observed after hydrogen exposure. This effect is caused by hydrogen-induced Ostwald ripening whereby the hydrogen reduces the binding energy of the cluster atoms leading to their detachment from the cluster. The composition changes due to a difference in mobility of the detached palladium and gold atoms on the surface. Fast palladium atoms contribute to the formation of larger nanoclusters, while the slower gold atoms are confined to the smaller nanoclusters. These transformations in the Pd-Au nanocluster size and composition set a limit for chemical reactions in which such nanoclusters are involved together with hydrogen.
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页数：4
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