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Titanium tetraisopropoxide (TTIP) was used as a titanium
source. NH4F was used as a precursor of the dopant. NH4F
was dissolved in pure water and then TTIP (0.0125 mol) was
added dropwise to 100 mL of the H2O-NH4F mixed solution
under vigorous stirring at room temperature. The atomic ratios
of F to Ti, which hereafter was designated as RF, were 0, 0.5,
1, 3, 5, 10, and 20 nominal atomic % (at. %). Sol samples£¿£¿£¿£¿£¿£¿£¿
obtained by the hydrolysis process were aged in a closed beaker
at room temperature for 24 h uto further hydrolyze the TTIP
and obtain monodisperse TiO2 particles. After aging, these
samples were dried at 100 ¡ãC for about 8 h in air to vaporize
water and alcohol in the gels and then ground to fine powders
to obtain xerogel samples. The xerogel samples were calcined
at temperatures of 400, 500, 600, and 700 ¡ãC in air for 1 h
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[ Last edited by MnO on 2007-12-3 at 22:39 ]
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