Fabrication and ultraviolet-shielding properties of silica-coated titania-doped ceria nanoparticles  

作　　者：陈伟凡 洪建明 李慧泉 李永绣 

机构地区：[1]School of Materials Science & Engineering, Nanchang University [2]Research Center of Rare Earths & Micro/Nano Functional Materials, Nanchang University [3]Center of Materials Analysis, Nanjing University [4]Chemistry Department, Fuyang Normal College

出　　处：《Journal of Rare Earths》2011年第8期810-814,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (21061011);the Jiangxi Provincial Natural Science Foundation (2008GZC0021);the Scientific & Technological Research Project of Jiangxi Educational Department (GJJ08008);the Jiangxi Provincial Foundation of Training Academic and Technical Leaders for Main Majors (2007DD00800);the Natural Science Foundation of Higher Education Institutions in Anhui Province (KJ 2007B231)

摘　　要：A series of well-dispersed titania-doped ceria nanoparticles Ce1–xTixO2 were rapidly prepared by a novel salt-assisted solution combustion process using correspondent metal nitrates as oxidizers and ethyl glycol as fuel, and then coated with amorphous silica by seeded polymerization using tetraethyl orthoslicate （TEOS）. The as-prepared samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）, Fourier-transform infrared spectroscopy （FTIR）, and ultraviolet-visible light （UV-Vis） diffuse reflectance spectroscopy. The results indicated that compared with the as-prepared pure ceria nanoparticles, the red-shift phenomenon occurred for Ti-doped ceria nanoparticles with Ti incorporation. Meanwhile, the absorption intensity in the UV light region slightly decreased and transmission rate in visible light region was somewhat enhanced. In comparison with the silica-coated CeO2 nanopowders, the silica-coated Ce0.95Ti0.05O2 nanopowders displayed the same absorption intensity in the UV light region, broader UV absorption band and higher transmission rate in visible light region.A series of well-dispersed titania-doped ceria nanoparticles Ce1–xTixO2 were rapidly prepared by a novel salt-assisted solution combustion process using correspondent metal nitrates as oxidizers and ethyl glycol as fuel, and then coated with amorphous silica by seeded polymerization using tetraethyl orthoslicate （TEOS）. The as-prepared samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）, Fourier-transform infrared spectroscopy （FTIR）, and ultraviolet-visible light （UV-Vis） diffuse reflectance spectroscopy. The results indicated that compared with the as-prepared pure ceria nanoparticles, the red-shift phenomenon occurred for Ti-doped ceria nanoparticles with Ti incorporation. Meanwhile, the absorption intensity in the UV light region slightly decreased and transmission rate in visible light region was somewhat enhanced. In comparison with the silica-coated CeO2 nanopowders, the silica-coated Ce0.95Ti0.05O2 nanopowders displayed the same absorption intensity in the UV light region, broader UV absorption band and higher transmission rate in visible light region.

关 键 词：ceria nanoparticles titania doping silica coating UV shielding salt-assisted solution combustion synthesis rare earths 

分 类 号：TB383.1[一般工业技术—材料科学与工程]