Structural characterization of SiO2/Zn2SiO4:Ce nanocomposite obtained by sol gel method

Ce-doped ZnO nanopowder and ZnO:Ce/silica nanocomposite were synthesized by sol–gel process under supercritical drying (temperature and pressure) of ethanol. Annealing at 1200°C under atmospheric pressure has been achieved for the prepared ZnO:Ce/silica nanocomposite. X-ray diffraction (XRD) showed...

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Bibliographic Details
Published in:Journal of the Association of Arab Universities for Basic & Applied Sciences 2014-04, Vol.15 (1), p.10-14
Main Authors: Chelouche, A., Djouadi, D., Aksas, A.
Format: Article
Language:English
Subjects:
Microstructure
Nanocomposites (Materials)
Photoluminescence
Synthesis
Zinc silicate
ZnO:Ce
ZnO:Ce/silica nanocomposite
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Summary:Ce-doped ZnO nanopowder and ZnO:Ce/silica nanocomposite were synthesized by sol–gel process under supercritical drying (temperature and pressure) of ethanol. Annealing at 1200°C under atmospheric pressure has been achieved for the prepared ZnO:Ce/silica nanocomposite. X-ray diffraction (XRD) showed good crystallinity and a ZnO hexagonal wurtzite structure of the as-prepared powder. The average crystallite size is of the order of 78nm. Crystallites agglomerate to form spheres, hexagons and/or hexagons inserted in tori. The introduction of ZnO:Ce in silica leads to the formation of zinc silicate even before annealing. The heat treatment reduces the intensity of the diffraction peaks and enhanced the formation of this new phase. Photoluminescence (PL) spectra showed that the introduction of ZnO:Ce in silica before annealing reduces the UV lines and red shifts the entire emission. After annealing the PL intensity of the nanocomposite is significantly reduced.
ISSN:1815-3852
1815-3852
DOI:10.1016/j.jaubas.2013.05.002