Europium incorporated into titanium oxide by the sol-gel method
AUTOR(ES)
Rocha, Lucas Alonso, Avila, Lilian Rodrigues, Caetano, Bruno Leonardo, Molina, Eduardo Ferreira, Sacco, Hérica Cristina, Ciuffi, Katia Jorge, Calefi, Paulo Sergio, Nassar, Eduardo José
FONTE
Materials Research
DATA DE PUBLICAÇÃO
2005-09
RESUMO
In this work titanium sol was prepared from tetraethylorthotitanate (TEOT) in ethanol, stabilized with beta-diketonate 2,4 pentanedione in molar ratio 1:1 homogenized by magnetic stirring, europium ion was add as structural probe. The xerogels were heat treated at 500, 750 and 1000 °C and the characterization was realized by x-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA/DSC) and photoluminescence (PL). The excitation spectra of Eu (III) ion present maximum in 394 nm correspondent to 5L6 level and emission spectra present bands characteristic transitions arising from the 5 D0 -> 7F J (J = 0, 1, 2, 3, 4) manifolds to samples treat at 500 and 750 °C. The Eu (III) emission disappear, when heated at 1000 °C, probably due to phase transition anatase to rutile and migrations of ions to the external surface that was proved by x-ray diffraction, transmission electronic microscopy and the thermogravimetric analyses of xerogels.
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