Imaging the Atomic Surface Structures of CeO2 Nanoparticles

Atomic surface structures of CeO2 nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures o...

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Bibliographic Details
Published in:Nano letters Vol. 14; no. 1; pp. 191 - 196
Main Authors: Lin, Yuyuan, Wu, Zili, Wen, Jianguo, Poeppelmeier, Kenneth R, Marks, Laurence D
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 08.01.2014
Subjects:
Catalytic methods
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Methods of nanofabrication
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
atomic surface structures
CeO2
nanocube
aberration corrected HREM
nanoparticle catalysis
Nanoparticles
High resolution electron microscopy
Vacancies
Aberrations
Imaging
Catalysis
Crystal faces
Crystallographic plane
Atomic structure
Nanostructured materials
Surface structure
ISSN:1530-6984, 1530-6992, 1530-6992
Online Access:Get full text
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Summary:Atomic surface structures of CeO2 nanoparticles are under debate owing to the lack of clear experimental determination of the oxygen atom positions. In this study, with oxygen atoms clearly observed using aberration-corrected high-resolution electron microscopy, we determined the atomic structures of the (100), (110), and (111) surfaces of CeO2 nanocubes. The predominantly exposed (100) surface has a mixture of Ce, O, and reduced CeO terminations, underscoring the complex structures of this polar surface that previously was often oversimplified. The (110) surface shows “sawtooth-like” (111) nanofacets and flat CeO2–x terminations with oxygen vacancies. The (111) surface has an O termination. These findings can be extended to the surfaces of differently shaped CeO2 nanoparticles and provide insight about face-selective catalysis.
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DE-AC05-00OR22725
USDOE Office of Science (SC)
ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/nl403713b