• structure and optical properties of ceo2 nanoparticles synthesized by precipitation

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 762
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
      cerium dioxide (ceo2) has special electrical and optical properties, and chemical and thermal stability. it has been used in semiconductor devices and as a luminescent material. in this work, ceo2 nanoparticles were synthesized by the precipitation method and the product annealed at various temperatures. thermogravimetric analysis (tga)/differential scanning calorimetry (dsc) results show that the optimum annealing temperature for fabrication of ceo2 nanoparticles is greater than 500°c. when the calcination temperature is increased from 550°c to 1050°c, fourier-transform infrared (ftir) results show that the water and impurities are almost completely removed, after calcination at 750°c. the x-ray diffraction (xrd) results suggest that the synthesized ceo2 exhibits a cubic fluorite structure. the crystallite size of the ceo2 increases from 8 nm to 75 nm when the calcination temperature is increased from 550°c to 1050°c. the absorption spectrum in the ultraviolet (uv) region from 372 nm to 395 nm demonstrates their applicability as uv-filter materials, and the shift of the estimated e g,eff from 3.21 ev to 3.65 ev demonstrates their applicability in photoelectric devices. ceo2 would be potentially important for applications such as insulator structures, stable capacitor devices, and light-emitting diodes (leds).

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