Novel Fabrication and Synthetic Mechanism of CeO2 Nanorods by a Chloride-Assisted Hydrothermal Method
CeO2 nanorods of 15–30 nm in diameter and 100–300 nm in length were successfully synthesized by a novel chloride-assisted hydrothermal synthesis process using CeCl3 · 7H2O as cerium source and N2H4 · H2O as mineralizer. The crystal phases, morphology, chemical state, and optical properties of CeO2 nanostructures were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, UV-vis spectrophotometer and fluorescence spectrometer. Under similar hydrothermal conditions, use of Ce(NO3)3 · 6H2O instead of CeCl3 · 7H2O as cerium source results in the growth of CeO2 nanoparticles rather than nanorods. The absorption edge of CeO2 nanorods showed a blue-shift compared with nanopariticles. Photoluminescence spectra of CeO2 nanorods exhibited a stronger emission than the nanoparticles. The synthetic mechanism of CeO2 nanorods has been proposed and can be mainly attributed to the coordination interaction between ethylenediamine and chlorine ions, as well as the effect of anions (Cl–, OH–) on the nucleation process and the morphology formation of CeO2 nanostructures.
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Document Type: Research Article
Publication date: 01 October 2012
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