Interfacial photoluminescence emission properties of core/shell Al2O3/ZrO2
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Data
2012-01-01
Autores
Raubach, Cristiane W.
Krolow, Matheus Z.
Mesko, Marcia F.
Cava, Sergio
Moreira, Mario L. [UNESP]
Longo, Elson [UNESP]
Carreno, Neftali L. V.
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Royal Soc Chemistry
Resumo
This research investigated the synthesis of the Al2O3/ZrO2 core-shell system using a polymeric precursor method. The interfacial features emission show the possibility for control of the luminescence behaviour. X-ray diffraction (XRD) patterns are well defined for alpha-Al2O3 and for gamma-Al2O3, core structures and a zirconia shell phase for high concentrations. Photoluminescence (PL) spectra (lambda(exc) = 350.7 nm) reveal that the effect of the zirconia coating on the alumina was more effective for alpha-Al2O3 than for gamma-Al2O3 which may be related to the zirconia coating process on alumina. The image transmission electron microscopy (TEM) shows an amorphous region of 10 nm which is attributed to a ZrO2 shell layer.
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Crystengcomm. Cambridge: Royal Soc Chemistry, v. 14, n. 2, p. 393-396, 2012.