Author/Authors :
Vincent Truffault، نويسنده , , Laurianne and Ta، نويسنده , , Minh-Tri and Devers، نويسنده , , Thierry and Konstantinov، نويسنده , , Konstantin and Harel، نويسنده , , Valérie and Simmonard، نويسنده , , Cyriaque and Andreazza، نويسنده , , Caroline and Nevirkovets، نويسنده , , Ivan P. and Pineau، نويسنده , , Alain and Veron، نويسنده , , Olivier and Blondeau، نويسنده , , Jean-Philippe، نويسنده ,
Abstract :
Calcium doped CeO2 nanoparticles with doping concentrations between 0 and 50 mol% were synthesized by a co-precipitation method for ultraviolet filtration application. Below 20 mol% doping concentration, the samples were single-phase. From 30 mol%, CaCO3 appears as a secondary phase. The calculated CeO2 mean crystallite size was 9.3 nm for the pure and 5.7 nm for the 50 mol% Ca-doped sample. Between 250 and 330 nm, the absorbance increased for the 10, 30, and 40 mol% Ca-doped samples compared to the pure one. The band-gap was found to be 3.20 eV for the undoped, and between 3.36 and 3.51 eV for the doped samples. The blue shifts are attributed to the quantum confinement effect. X-ray photoelectron spectroscopy showed that the Ce3+ atomic concentration in the pure sample was higher than that of the 20 mol% Ca-doped sample.
Keywords :
A. Nanostructures , B. Chemical synthesis , C. X-ray diffraction , C. Electron microscopy , D. Optical properties
