SYNTHESIS AND CHARACTERIZATION OF Si OXIDE COATED NANO CERIA BY HYDROLYSIS, AND HYDROTHERMAL TREATMENT AT LOW TEMPERATURE

Abstract

The purpose of this work was to the application of Si oxide coatings. This study deals with the preparation of ceria (CeO₂) nanoparticles coating with SiO₂ by water glass and hydrolysis reaction. First, the low temperature hydro-reactions were carried out at 30~100°C. Second, Silicon oxide-coated Nano compounds were obtained by the catalyzing synthesis. CeO₂ Nano-powders have been successfully synthesized by means of the hydrothermal method, in a low temperature range of 100~200°C. In order to investigate the structure and morphology of the Nano-powders, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed. The XRD results revealed the amorphous nature of silica nanoparticles. To analyze the quantity and properties of the compounds coated with Si oxide, transmission electron microscopy (TEM) in conjunction with electron dispersive spectroscopy was used. Finally, it is suggested that the simple growth process is more favorable mechanism than the solution/aggregation process.