• synthesis, structural and optical characterization of sol–gel-derived y-doped mesoporous ceo2

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 869
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      highly crystalline and thermally stable undoped ceo2 and y-doped mesoporous ceo2 particles have been synthesized from cerium(iii) nitrate hexahydrate [ce(no3)3·6h2o] by the sol–gel method. mesoporous ceo2 doped with 2 mol.% y2o3 and calcined at 500°c possesses specific surface area of 130.39 m2/g and retains a surface area of 91.84 m2/g at 600°c. in comparison, undoped calcined materials have smaller specific surface areas of 43.23 m2/g and 20.24 m2/g at 500°c and 600°c, respectively. results from x-ray diffraction (xrd) analysis, raman spectroscopy, and selected-area electron diffraction (saed) analysis indicated that the synthesized undoped ceo2 and y-doped mesoporous ceo2 have the fluorite structure of bulk ceo2. the crystallite size of ceo2 is also considerably reduced by doping. the optical bandgap was found to be 3.24 ev for the undoped and 3.36 ev for the doped samples with calcination at 600°c. these results suggest that there are potential applications of y-doped mesoporous ceo2 with nanocrystals in the design of photocatalysts and optical devices.

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