HAADF STEM observation of the Au/CeO2 nanostructures

被引：8

作者：

Chen, Yong ^{[1
,2
]}

Chen, Yue ^{[1
]}

Qiu, Changjun ^{[1
]}

Chen, Chunlin ^{[2
]}

Wang, Zhongchang ^{[2
]}

机构：

[1] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China

[2] Tohoku Univ, Adv Inst Mat Res, Aoba Ku, Sendai, Miyagi 980, Japan

来源：

MATERIALS LETTERS | 2015年 / 141卷

基金：

美国国家科学基金会;

关键词：

Au/CeO2; Hydrothermal synthesis; Scanning transmission electron microscopy; GOLD NANOCLUSTERS; CATALYSIS; OXIDATION; HYDROGEN; OXIDES;

D O I：

10.1016/j.matlet.2014.11.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Gold nanoparticles supported on oxide substrates are widely utilized as heterogeneous catalysts. Here, we apply a facile surfactant- and template-free hydrothermal method to fabricate Au/CeO2 nanostructures, and show a successful preparation of well-defined CeO2 nano-octahedrons with Au nanoparticles on their surface. The high-angle annular dark field scanning transmission microscopy imaging technique is applied to investigate microstructure of the Au/CeO2 nanostructure. We find that the Au clusters with a diameter of less than 2 nm cannot form the FCC Au lattice, and that twins emerge in the Au nanoparticles with a diameter of larger than 2 nm. Moreover, we identify preferential orientation relationships {111}(Au) parallel to {111}(CeO2) and < 110 >(Au) parallel to < 110 >(CeO2) between the Au nanoparticles and CeO2 nano-octahedrons. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：31 / 34

页数：4

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