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Synthesis and Optical Properties of SiO2-Coated CeO2 Nanoparticles |
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| Authors: | Tago Teruoki Tashiro Shizuka Hashimoto Yukiko Wakabayashi Katsuhiko Kishida Masahiro |
| Affiliation: | (1) Chemical Engineering Group, Department of Materials Process Engineering, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-Ku, Fukuoka, 812-8581, Japan;(2) Present address: Materials Process Engineering, Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, N13W8, Kita-Ku, Sapporo, 060-8628, Japan |
| Abstract: | Silica (SiO2)-coated ceria (CeO2) nanoparticles were prepared using water-in-oil microemulsion. Polyoxyethylene (15) cetylether and cyclohexane were used as a surfactant and organic solvent. SiO2-coated CeO2 nanoparticles were obtained by hydrolysis of metal alkoxide (tetraethylorthosilicate, TEOS) in the solution containing CeO2 precursor nanoparticles. The effects of CeO2 sources (Ce metal salt) and CeO2 particle-forming agents on the morphology of SiO2–CeO2 particles were investigated. Observation via transmission electron microscopy revealed that the type of particle-forming agent affected the nanoparticles' morphology and that CeO2 nanoparticles were spherically coated with SiO2 when using oxalic acid ((COOH)2) as a particle-forming agent of CeO2. Furthermore, the transmittance of the particles was high in the visible region (above 400 nm) and decreased in the ultraviolet region. |
| Keywords: | CeO2 SiO2-coated microemulsion nanostructured coating ultraviolet absorption |
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