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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]

Abstract: The controllable synthesis of hexagonal pine-like Zn-doped CdSe (Cd1−x Zn x Se, x =0.1–0.3) nanotrees from the self-prepared mixed-metal precursors has been achieved by two facile steps: first, mixed-metal precursors (x =0.1–0.3) were prepared directly through precipitation reactions of stoichiometric cadmium acetate, zinc acetate and sodium selenite in distilled water under ambient condition; second, pure hexagonal phase pine-like Cd1−x Zn x Se (x =0.1–0.3) nanotrees with different ratios were produced via solvothermal treatment of the precursor compounds in hydrazine hydrate at 180°C for 12h. The products were characterized by powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrum (EDS) and UV–vis absorption spectroscopy. It was observed that the optical band gap energies of the as-synthesized Cd1−x Zn x Se (x =0.1–0.3) nanotrees shift systematically toward shorter wavelengths with an increase of the Zn content. [Copyright &y& Elsevier]