The elliptic-triangle-like CeO2 nanosheets with many fissures have been purposefully fabricated via controlling the morphology of CeCO3OH precursors by an efficient hydrothermal route. The X-ray diffraction results indicate that the calcined samples have a cubic fluorite structure of CeO2 with no crystalline impurity phase. The scanning electron microscope images display that the morphology of the as-synthesized nanostructures gradually changes from diamond-like to tabular, then to elliptic-triangle-like nanosheet, and finally to fireworks-like/circular nanosheets mixed structure with the decrease of reaction temperature. X-ray photoelectron spectroscopy and Raman analyses demonstrate that there are Ce3+ ions and oxygen vacancies in the surface of samples. It is also found that there is a red-shifting in the band gap of the obtained material compared to bulk one, which is mainly attributed to the influences of the Ce3+ ions, oxygen vacancies and the morphology. All the samples exhibit the similar emission peaks of room temperature photoluminescence and the emission intensity increases with the increase of concentration of oxygen vacancies.
Journal of Materials Science: Materials in Electronics – Springer Journals
Published: May 22, 2017
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