Synthesis and Photochemical Properties of Calcia-Doped Ceria Nanoparticles Coated with Amorphous Silica

Abstract

Nanoparticles of calcia doped ceria coated with amorphous silica were prepared for UV shielding via soft solution chemical routes at 40-90°C. The oxidation catalytic activity of ceria was effectively depressed by doping with calcia and/or coating with silica. Doping with calcia resulted in extremely decreasing the particle size (2-4 nm), and consequently increasing UV light (λ<400 nm) absorbing capacity and transparency in the visible ray region (λ>400 nm).