Imaging the atomic surface structures of CeO2 nanoparticles

Yuyuan Lin, Zili Wu, Jianguo Wen, Kenneth R. Poeppelmeier, Laurence D. Marks

Research output: Contribution to journalArticle

115 Citations (Scopus)

Abstract

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 CeO 2 nanoparticles and provide insight about face-selective catalysis.

Original languageEnglish
Pages (from-to)191-196
Number of pages6
JournalNano letters
Volume14
Issue number1
DOIs
Publication statusPublished - Jan 8 2014

Keywords

  • CeO
  • aberration corrected HREM
  • atomic surface structures
  • nanocube
  • nanoparticle catalysis

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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