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 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.
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.
Suresh
S
Babu
Ranjith
R
Thanneeru
Talgat
T
Inerbaev
Richard
R
Day
Artëm E
AE
Masunov
Alfons
A
Schulte
Sudipta
S
Seal
D000537:Aluminum Oxide / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
C475766:Ce-TZP-Al2O3; D046911:Macromolecular Substances; C009495:titanium dioxide; D002563:Cerium; D015040:Zirconium; D014025:Titanium; D000537:Aluminum Oxide; D010100:Oxygen