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Datos técnicos
Revista | Physical Review Letters |
---|---|
Año | 2011 |
Volumen | 106 |
Páginas | 246801 |
Internacional | Sí |
Electron Localization in Defective Ceria Films: A Study with Scanning-Tunneling Microscopy and Density-Functional Theory
Autores:Jan-Frederik Jerratsch , Xiang Shao , Niklas Nilius , H.-J. Freund , Cristina Popa , María Verónica Ganduglia Pirovano, Asbjoern M. Burow , J. Sauer
Grupos de investigación:Catálisis Teórica y Modelización
Scanning-tunneling microscopy and density-functional theory have been
employed to identify the spatial correlation between an oxygen vacancy
and the associated Ce(3+) ion pair in a defective CeO(2)(111) film. The
two Ce(3+) ions can occupy different cationic shells around the vacancy.
The resulting variation in the chemical environment leads to a
splitting of the filled Ce(3+) f levels, which is detected with STM
spectroscopy. The position of the Ce(3+) ion pair is reflected in
characteristic defect patterns observed in empty-state STM images, which
arise from the bright appearance of Ce(4+) ions next to the defect
while the Ce(3+) remain dark. Both findings demonstrate that at least
one excess electron localizes in a Ce ion that is not adjacent to the O
vacancy.
Palabras clave:SURFACES, NANOPARTICLES, MORPHOLOGY, CATALYSTS, GOLD, CEO2