Search

Abstract: Orthorhombic single-crystalline cerium carbonate hydroxide (CeCO3OH) with one-dimensional (1D) microstructures has been successfully synthesized by a facile sonochemical reaction between cerous nitrate and urea. These 1D microstructures were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM). The as-synthesized CeCO3OH has uniform lengths and good dispersion. Synthetic parameters, such as the concentration of reagents, were found to have close relationship with the morphologies and sizes of the final products. The ultrasound-induced oriented attachment growth mechanism has been proposed for the possible formation mechanism of sample. Room-temperature photoluminescence of CeCO3OH samples with different morphologies has also been investigated. [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]