STM study of the growth of cerium oxide nanoparticles on Au(1 1 1)

The morphology and structure of nanosized ceria particles prepared by several in vacuo deposition methods on a Au(1 1 1) template were investigated by scanning tunneling microscopy. Cerium metal nanoparticles on gold have limited reactivity toward molecular oxygen and NO 2, due to the formation of C...

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Bibliographic Details
Published in:Surface science 2008-11, Vol.602 (21), p.3272-3278
Main Authors: Ma, Shuguo, Rodriguez, Jose, Hrbek, Jan
Format: Article
Language:English
Subjects:
Cerium oxide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Gold
Growth
Physics
Scanning tunneling microscopy
Sintering
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Summary:The morphology and structure of nanosized ceria particles prepared by several in vacuo deposition methods on a Au(1 1 1) template were investigated by scanning tunneling microscopy. Cerium metal nanoparticles on gold have limited reactivity toward molecular oxygen and NO 2, due to the formation of Ce–Au alloys, and their oxidation leads to formation of non-uniform substoichiometric three-dimensional (3D) oxide particles. Cerium metal deposition onto condensed multilayers of water or NO 2 generates fully oxidized but poorly ordered ceria particles after annealing. Ultra-thin flat and ordered ceria nanoislands were prepared by deposition of cerium metal on the gold surface at elevated temperatures under an oxygen background pressure. Atomically resolved images show an oxygen-terminated surface of CeO 2(1 1 1) with oxygen vacancies.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2008.08.021