Dopant-Mediated Oxygen Vacancy Tuning In Ceria Nanoparticles
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. © 2009 IOP Publishing Ltd.
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Babu, Suresh; Thanneeru, Ranjith; Inerbaev, Talgat; Day, Richard; and Masunov, Artëm E., "Dopant-Mediated Oxygen Vacancy Tuning In Ceria Nanoparticles" (2009). Scopus Export 2000s. 11868.