Morphology of size-selected Ptn clusters on CeO2(111)

被引：13

作者：

Shahed, Syed Mohammad Fakruddin ^{[1
]}

Beniya, Atsushi ^{[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, 1200 Mishuku, Shizuoka 4101193, Japan

来源：

JOURNAL OF CHEMICAL PHYSICS | 2018年 / 148卷 / 11期

关键词：

SCANNING-TUNNELING-MICROSCOPY; PLATINUM CLUSTERS; THIN-FILMS; CATALYTIC-ACTIVITY; OXIDATION; SURFACE; NANOPARTICLES; TIO2(110); RU(0001); SUPPORT;

D O I：

10.1063/1.5017906

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：

Supported Pt catalysts and ceria are well known for their application in automotive exhaust catalysts. Size-selected Pt clusters supported on a CeO2(111) surface exhibit distinct physical and chemical properties. We investigated the morphology of the size-selected Pt-n (n = 5-13) clusters on a CeO2(111) surface using scanning tunneling microscopy at room temperature. Pt-n clusters prefer a two-dimensional morphology for n = 5 and a three-dimensional (3D) morphology for n >= 6. We further observed the preference for a 3D tri-layer structure when n >= 10. For each cluster size, we quantitatively estimated the relative fraction of the clusters for each type of morphology. Size-dependent morphology of the Ptn clusters on the CeO2(111) surface was attributed to the Pt-Pt interaction in the cluster and the Pt-O interaction between the cluster and CeO2(111) surface. The results obtained herein provide a clear understanding of the size-dependent morphology of the Pt-n clusters on a CeO2(111) surface. Published by AIP Publishing.

引用

页数：8

共 36 条

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