Sequential HAADF-STEM observation of structural changes in Au nanoparticles supported on CeO2

Akita, Tomoki; Tanaka, Shingo; Tanaka, Koji; Haruta, Masatake; Kohyama, Masanori

doi:10.1007/s10853-011-5370-6

Cited by 24 publications

(35 citation statements)

References 37 publications

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“…[1e,48a,54] Understanding the growth mechanism of Au particles on a CeO 2 support is therefore of primary importance. [5b,55] Akita et al performed ex situ TEM characterizations of the changes of Au nanoparticles under heating at various temperatures both in air and in an hydrogen stream. [55d] The average diameter of the Au nanoparticles changes from 1.9 to 6.1 nm after heating in air.…”

Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

“…[5b,55] Akita et al performed ex situ TEM characterizations of the changes of Au nanoparticles under heating at various temperatures both in air and in an hydrogen stream. [55d] The average diameter of the Au nanoparticles changes from 1.9 to 6.1 nm after heating in air. Because of Ostwald ripening, large Au nanoparticles grow at the expense of smaller one, in agreement with the in situ heating experiments of Au nanoparticles on CeO 2 .…”

Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

“…Because of Ostwald ripening, large Au nanoparticles grow at the expense of smaller one, in agreement with the in situ heating experiments of Au nanoparticles on CeO 2 . [55a] However, the size of the Au nanoparticles does not increase with increasing the temperature in a hydrogen stream. Oxygen vacancies are probably created on the CeO 2 surface, as observed by scanning tunnelling microscopy in ultrahigh vacuum conditions, and prevent the diffusion of Au atoms in a hydrogen atmosphere, suppressing growth of the Au nanoparticles .…”

Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

See 2 more Smart Citations

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Zhang

Bals

Tendeloo

2018

Part & Part Syst Charact

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Engineering morphology and size of CeO2‐based nanostructures on a (sub)nanometer scale will greatly influence their performance; this is because of their high oxygen storage capacity and unique redox properties, which allow faster switching of the oxidation state between Ce4+ and Ce3+. Although tremendous research has been carried out on the shape‐controlled synthesis of CeO2, the characterization of these nanostructures at the atomic scale remains a major challenge and the origin of debate. The rapid developments of aberration‐corrected transmission electron microscopy (AC‐TEM) have pushed the resolution below 1 Å, both in TEM and in scanning transmission electron microscopy (STEM) mode. At present, not only morphology and structure, but also composition and electronic structure can be analyzed at an atomic scale, even in 3D. This review summarizes recent significant achievements using TEM/STEM and associated spectroscopic techniques to study CeO2‐based nanostructures and related catalytic phenomena. Recent results have shed light on the understanding of the different mechanisms. The potential and limitations, including future needs of various techniques, are discussed with recommendations to facilitate further developments of new and highly efficient CeO2‐based nanostructures.

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Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

Section: Electron Microscopy Characterization Of Ceo2‐based Nanostrucmentioning

confidence: 99%

See 1 more Smart Citation

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Zhang

Bals

Tendeloo

2018

Part & Part Syst Charact

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“…That is to say, the addition of Au resulted in an increase in the responses of both types of sensors investigated. This was due to the strong reaction between the Au atoms and the oxygen vacancies [17,22]. We also checked the reproducibility of the responses of the sensors.…”

Section: Resultsmentioning

confidence: 99%

CO Responses of Sensors Based on Cerium Oxide Thick Films Prepared from Clustered Spherical Nanoparticles

Izu

Matsubara

Itoh

et al. 2013

Sensors

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Various types of CO sensors based on cerium oxide (ceria) have been reported recently. It has also been reported that the response speed of CO sensors fabricated from porous ceria thick films comprising nanoparticles is extremely high. However, the response value of such sensors is not suitably high. In this study, we investigated methods of improving the response values of CO sensors based on ceria and prepared gas sensors from core-shell ceria polymer hybrid nanoparticles. These hybrid nanoparticles have been reported to have a unique structure: The core consists of a cluster of ceria crystallites several nanometers in size. We compared the characteristics of the sensors based on thick films prepared from core-shell nanoparticles with those of sensors based on thick films prepared from conventionally used precipitated nanoparticles. The sensors prepared from the core-shell nanoparticles exhibited a resistance that was ten times greater than that of the sensors prepared from the precipitated nanoparticles. The response values of the gas sensors based on the core-shell nanoparticles also was higher than that of the sensors based on the precipitated nanoparticles. Finally, improvements in sensor response were also noticed after the addition of Au nanoparticles to the thick films used to fabricate the two types of sensors.

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“…371 The variations in size and shape of gold particles at elevated temperatures in the Au/CeO 2 catalysts have been observed. [372][373][374][375][376] One interesting phenomenon was that the atomic structure at the perimeters of the Au/CeO 2 interfaces changed significantly through a cyclic process of layer-by-layer shrinkage and recovery of Au-NPs (Figure 10.34). During the TEM observations, relatively small Au-NPs shrank layer by layer and eventually disappeared, whereas a monolayer tended to remain.…”

Section: Au/ceo 2 Nanocatalystsmentioning

confidence: 99%

Tuning the Morphology of Metal Oxides for Catalytic Applications

Shen

2013

Nanocatalysis Synthesis and Applications

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Sequential HAADF-STEM observation of structural changes in Au nanoparticles supported on CeO2

Cited by 24 publications

References 37 publications

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

CO Responses of Sensors Based on Cerium Oxide Thick Films Prepared from Clustered Spherical Nanoparticles

Tuning the Morphology of Metal Oxides for Catalytic Applications

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Sequential HAADF-STEM observation of structural changes in Au nanoparticles supported on CeO2

Cited by 24 publications

References 37 publications

Understanding CeO2‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Understanding CeO2‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

CO Responses of Sensors Based on Cerium Oxide Thick Films Prepared from Clustered Spherical Nanoparticles

Tuning the Morphology of Metal Oxides for Catalytic Applications

Contact Info

Product

Resources

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Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D

Understanding CeO₂‐Based Nanostructures through Advanced Electron Microscopy in 2D and 3D