A resonant photoemission applied to cerium oxide based nanocrystals

作者：Matolin V^*; Matolinova I; Sedlacek L; Prince K C; Skala T

来源：Nanotechnology, 2009, 20(21): 215706.

DOI：10.1088/0957-4484/20/21/215706

Cerium 4f level occupation determines the properties of cerium oxide based catalysts in a significant way. The Ce 4f level of nanosized cerium oxide particles was investigated with the use of resonant photoelectron spectroscopy in the Ce 4d-4f photoabsorption region. A strong interaction of ceria with different additives, e. g. Pd and Sn, led to a partial Ce(4 ) -> Ce(3 ) transition that was observed as a significant resonance enhancement of 4f photoemission intensity. Increases of the CO oxidation catalytic activity were observed simultaneously. The ratio of resonance enhancement of Ce photoemission intensity DCe(3 )/DCe(4 ) was used to monitor Ce(3 ) and Ce(4 ) state occupation. The relative parameter DCe(3 )/DCe(4 ) was found to be particularly useful in the case of photoemission studies of nanopowder ceria catalysts.

• 出版日期2009-5-27