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Article Dans Une Revue Materials Chemistry and Physics Année : 2010

Effect of hydrothermal ripening on the photoluminescence properties of pure and doped cerium oxide nanoparticles

Résumé

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 420 nm 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.

Dates et versions

hal-00480699 , version 1 (04-05-2010)

Identifiants

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Mickaël Palard, Jérémy Balencie, Aude Maguer, Jean-François Hochepied. Effect of hydrothermal ripening on the photoluminescence properties of pure and doped cerium oxide nanoparticles. Materials Chemistry and Physics, 2010, 120, pp.79-88. ⟨10.1016/j.matchemphys.2009.10.025⟩. ⟨hal-00480699⟩
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