HAADF STEM observation of the Au/CeO2 nanostructures

Yong Chen; Yue Chen; Changjun Qiu; Chunlin Chen; Zhongchang Wang

doi:10.1016/j.matlet.2014.11.048

HAADF STEM observation of the Au/CeO₂ nanostructures

Yong Chen, Yue Chen, Changjun Qiu, Chunlin Chen, Zhongchang Wang

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

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∥{111}_CeO2 and ∥_110∥Au∥110∥CeO² between the Au nanoparticles and CeO₂ nano-octahedrons.

Original language	English
Pages (from-to)	31-34
Number of pages	4
Journal	Materials Letters
Volume	141
DOIs	https://doi.org/10.1016/j.matlet.2014.11.048
Publication status	Published - 2015 Feb 15

Keywords

Au/CeO
Hydrothermal synthesis
Scanning transmission electron microscopy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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@article{672d32128b8d4b6697bd1fb4982c6653,

title = "HAADF STEM observation of the Au/CeO2 nanostructures",

abstract = "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∥{111}CeO2 and ∥110∥Au∥110∥CeO2 between the Au nanoparticles and CeO2 nano-octahedrons.",

keywords = "Au/CeO, Hydrothermal synthesis, Scanning transmission electron microscopy",

author = "Yong Chen and Yue Chen and Changjun Qiu and Chunlin Chen and Zhongchang Wang",

note = "Funding Information: Y.C. thanks the financial support by the Construct Program of the Key Discipline of Hunan province, the Doctor Start-up Foundation of University of South China (Grant no. 2013XQD01 ), the Excellent Young Foundation of Education Department of the Hunan province ( 14B152 ). C.C. acknowledges support from the Grant-in-Aid for Young Scientists (B) (Grant no. 26820288 ). Z.W. thanks the financial support from the Grant-in-Aid for Young Scientists (A) (Grant no. 24686069 ), National Science Foundation of China (Grant no. 11332013 ), the JSPS and CAS under Japan–China Scientific Cooperation Program, and the Murata Science Foundation. ",

year = "2015",

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doi = "10.1016/j.matlet.2014.11.048",

language = "English",

volume = "141",

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journal = "Materials Letters",

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TY - JOUR

T1 - HAADF STEM observation of the Au/CeO2 nanostructures

AU - Chen, Yong

AU - Chen, Yue

AU - Qiu, Changjun

AU - Chen, Chunlin

AU - Wang, Zhongchang

N1 - Funding Information: Y.C. thanks the financial support by the Construct Program of the Key Discipline of Hunan province, the Doctor Start-up Foundation of University of South China (Grant no. 2013XQD01 ), the Excellent Young Foundation of Education Department of the Hunan province ( 14B152 ). C.C. acknowledges support from the Grant-in-Aid for Young Scientists (B) (Grant no. 26820288 ). Z.W. thanks the financial support from the Grant-in-Aid for Young Scientists (A) (Grant no. 24686069 ), National Science Foundation of China (Grant no. 11332013 ), the JSPS and CAS under Japan–China Scientific Cooperation Program, and the Murata Science Foundation.

PY - 2015/2/15

Y1 - 2015/2/15

N2 - 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∥{111}CeO2 and ∥110∥Au∥110∥CeO2 between the Au nanoparticles and CeO2 nano-octahedrons.

AB - 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∥{111}CeO2 and ∥110∥Au∥110∥CeO2 between the Au nanoparticles and CeO2 nano-octahedrons.

KW - Au/CeO

KW - Hydrothermal synthesis

KW - Scanning transmission electron microscopy

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