Morphology and chemical states of size-selected Ptn clusters on an aluminium oxide film on NiAl(110)

被引：18

作者：

Beniya, Atsushi ^{[1
]}

Isomura, Noritake ^{[1
]}

Hirata, Hirohito ^{[2
]}

Watanabe, Yoshihide ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan

[2] Toyota Motor Co Ltd, Shizuoka 4101193, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 48期

关键词：

PLATINUM CLUSTERS; STRUCTURAL-CHARACTERIZATION; ELECTRONIC-STRUCTURE; CATALYTIC-ACTIVITY; CARBON-MONOXIDE; CO OXIDATION; 0001; SURFACE; ADSORPTION; PD; PARTICLES;

D O I：

10.1039/c4cp01767f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption states of size-selected Pt-n clusters (7 <= n <= 20) soft-landed on an Al2O3/NiAl(110) substrate were investigated using scanning tunneling microscopy, infrared reflection absorption spectroscopy, and temperature programmed desorption. Pt-n clusters lay flat on the surface with a planar structure (n <= 18), and three-dimensional two-layer clusters start to appear at n >= 19. By considering the Pt-Pt and Pt-oxide bonds in the cluster, the morphological transition could be reasonably explained. Using CO probe molecules, the chemical states of the Pt atoms inside the clusters were investigated. Two ontop CO species were observed inside the clusters, and were assigned as adsorbed CO on neutral and slightly cationic Pt atoms. Despite the first layer Pt atoms, the Pt-n clusters are composed of two kinds of Pt atoms. The observed size dependence of the Pt atoms inside the clusters may contribute to the size-dependent chemical reactivity of Pt-n clusters on the Al2O3 surface.

引用

页码：26485 / 26492

页数：8

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