Abstract
Abstract Orthorhombic single-crystal CeCO 3 OH flower-like nanostructures have been successfully synthesized on a large scale by the hydrothermal method at 120 °C using Ce(NO 3 ) 3 ·6H 2 O as the cerium source, aqueous urea as both an alkaline and carbon source and polyvinyl alcohol as surfactant. Polycrystalline CeO 2 nanostructures have been obtained by thermal decomposition–oxidation of single-crystalline CeCO 3 OH flower-like nanostructures at 500 °C in flowing air. CeCO 3 OH flower-like nanostructures and CeO 2 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 CeO 2 nanostructures indicated that this material was suitable as UV-blocking material.
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