期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 120, 期 1, 页码 79-88出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.10.025
关键词
Nanoparticles; Cerium oxide; Precipitation; Crystal growth; Hydrothermal ripening; Photoluminescence
资金
- European Community [FP7/2007-2013]
We synthesized and characterized a set of undoped and doped cerium oxide nanoparticles with the following chemical formula: Ce1-xMxO2-(x/2) (M: Y or Gd and x = 0 or 0.15) by different coprecipitation protocols at room temperature. Room temperature photoluminescence spectra were similar whatever the protocols and doping. After hydrothermal ripening at neutral pH, a moderate but significant particle growth was observed for doped particles whereas undoped ones remained the same. Simultaneously, the photoluminescence band at 400 nm was significantly red-shifted and practically vanished for doped particles whereas it was only slightly weaker and shifted for pure ceria. All other bands in the same region were much less affected: the bands at 363 and 378 nm became more intense, the shoulder at 420nm remained roughly unchanged. These phenomena were observed systematically whatever the coprecipitation protocol. As a consequence, the band at 400 nm can be specifically attributed to surface defects that disappear during growth under hydrothermal conditions. (C) 2009 Elsevier B.V. All rights reserved.
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