期刊
NANOTECHNOLOGY
卷 20, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/20/8/085713
关键词
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资金
- NSF NIRT [CBET-0708172]
- CMII [0548815]
- UCF IST
- UCF NSTC
- US Army RDECOM-STC [N6133907C0107]
Ceria nanoparticles with 20 and 40 at.% RE ( RE = Y, Sm, Gd, and Yb) dopants were synthesized through a microemulsion method. Independently of the dopant nature and concentration, nearly monodispersed nanoparticles of size 3-5 nm were observed in high resolution transmission electron microscopic analysis. The ceria lattice either expands or contracts depending on the dopant cation ionic radii, as indicated by x-ray diffraction studies. X-ray photoelectron and Raman spectroscopic studies were used to quantify the cerium oxidation state and oxygen vacancy concentration. The results show the tunability of the oxygen vacancy and Ce3+ concentrations based on the dopant properties. First principles simulations using the free energy density functional theory method support the observed experimental trends. The reported results establish a relationship between the oxygen vacancies and oxidation states in doped ceria required for tailoring properties in catalytic and biomedical applications.
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