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Abstract: Orthorhombic single-crystal CeCO3OH flower-like nanostructures have been successfully synthesized on a large scale by the hydrothermal method at 120°C using Ce(NO3)3·6H2O as the cerium source, aqueous urea as both an alkaline and carbon source and polyvinyl alcohol as surfactant. Polycrystalline CeO2 nanostructures have been obtained by thermal decomposition–oxidation of single-crystalline CeCO3OH flower-like nanostructures at 500°C in flowing air. CeCO3OH flower-like nanostructures and CeO2 nanostructures were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM), room temperature UV/vis absorption spectrum, differential scanning calorimetric analysis (DSC), and thermogravimetric analysis (TG). The high absorption in the UV region for CeO2 nanostructures indicated that this material was suitable as UV-blocking material. [Copyright &y& Elsevier]

CeO2 hollow microspheres have been synthesized by hydrothermal decomposition reaction of Ce(NO3)3 on the surfaces of silica microspheres. The shell thickness of CeO2 hollow microspheres can be controlled from 20 to 50nm by adjusting the concentration of Ce(NO3)3 in the reaction solution. The high UV absorption of CeO2 hollow microspheres indicates that this material is suitable as a UV-blocking material. [Copyright &y& Elsevier]