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      Dopant-mediated oxygen vacancy tuning in ceria nanoparticles.

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          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 Ce(3+) 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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          Author and article information

          Journal
          Nanotechnology
          Nanotechnology
          IOP Publishing
          1361-6528
          0957-4484
          Feb 25 2009
          : 20
          : 8
          Affiliations
          [1 ] Advanced Material Processing and Analysis Center (AMPAC), Mechanical, Materials, and Aerospace Engineering (MMAE), University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816, USA.
          Article
          S0957-4484(09)93189-0
          10.1088/0957-4484/20/8/085713
          19417474
          18c75f45-8601-430b-a2eb-25e24ba6935c

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