Title

Dopant-Mediated Oxygen Vacancy Tuning In Ceria Nanoparticles

Abstract

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.

Publication Date

5-20-2009

Publication Title

Nanotechnology

Volume

20

Issue

8

Number of Pages

-

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0957-4484/20/8/085713

Socpus ID

65549124121 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/65549124121

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