Hydrothermal Synthesis and Optical Properties of Ellipsoid-Like CeO₂ Nanostructures with Rugged Surface and Many Pores

Abstract:

The almost monodisperse ellipsoid-like CeO₂ nanostructures with rugged surface and many pores have been synthesized by a smart hydrothermal technique. Various techniques have been applied to investigate the CeO₂ nanostructures, including XRD, SEM, XPS, Raman scattering, UV-vis and Photoluminescence (PL) spectra. The results showed that the ellipsoid-like CeO₂ have a fluorite cubic structure and there are Ce³⁺ ions and oxygen vacancies existing in surface of samples. It is also found that there is a red-shifting in the band gap of the materials compared to bulk one, which is mainly attributed to the influences of the Ce³⁺ ions, oxygen vacancies and the morphology of the materials. The photoluminescence measurement indicated that the ellipsoid-like CeO₂ samples exhibit excellent optical properties at room temperature, which can be reasonably explained for the influences of the concentration of oxygen vacancies and Ce³⁺ ions.

• Periodical: Journal of Nano Research (Volume 48)
• Pages: 95-103
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.48.95
• Online since: July 2017
• Authors: Xiao Fei Niu*
• Keywords: Defects, Ellipsoid-Like CeO₂, Hydrothermal Method, Optical Properties, Porous

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