Journal of Electroceramics

, Volume 17, Issue 1, pp 9–14 | Cite as

Synthesis and UV-shielding properties of silica-coated calcia-doped ceria nanoparticles via soft solution processes

  • Ahmed Mohamed El-Toni
  • Shu Yin
  • Yuichiro Hayasaka
  • Tsugio Sato
Section 3: Functional Ceramics


White nanoparticles of calcia-doped ceria were prepared from the precipitate by reacting CeCl3-CaCl2mixed solution with NaOH solution at pH 12 and the oxidation with hydrogen peroxide solution at 40C, followed by the calcination at 700C for 1 h. The sample before calcination contained significant amount of OH in the lattice and was yellow, but the powders calcined above 700C were white, indicating that cation defect formed by replacing O2 − with OH played as the color center. It is confirmed that calcia-doped ceria showed much lower photocatalytic activity as well as lower generation of singlet oxygen under UV light irradiation than those with titania and zinc oxide. Calcia-doped ceria particles were coated with amorphous silica by means of sol-gel reaction technique using hydrolysis of tetraethylorthosilicate (TEOS) or acid hydrolysis of sodium silicate. The silica coating by sol-gel reaction with TEOS was much more efficient for the reduction of catalytic activity of ceria for the oxidation of organic materials without loss of UV-shielding ability than that by acid hydrolysis of sodium silicate.


Ceria Calcia doping Silica coating UV-shielding Oxidation catalytic activity 


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Copyright information

© Springer Science + Business Media, LLC 2006

Authors and Affiliations

  • Ahmed Mohamed El-Toni
    • 1
  • Shu Yin
    • 1
  • Yuichiro Hayasaka
    • 2
  • Tsugio Sato
    • 1
  1. 1.Institute of Multidisciplinary Research for Advanced MaterialsTohoku UniversitySendaiJapan
  2. 2.High Voltage Electron Microscope LaboratoryTohoku UniversitySendaiJapan

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