Controlled synthesis and magnetic properties of thin CeO2 nanotubes by a facile template-free hydrothermal method
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Uniform CeO2 nano-octahedrons and the straw-like CeO2 nanostructures assembled by numerous thin nanotubes have been successfully synthesized by a facile one-step hydrothermal synthesis route only using Ce(NO3)3·6H2O as cerium resource, Na3PO4·6H2O as mineralizer and no surfactant or template. The reaction time was systematically investigated. XRD, SEM, TEM, XPS, Raman scattering, Photoluminescence spectra and M-H curves were employed to characterize the samples. The results showed that both CeO2 nano-octahedrons and nanotubes owned a fluorite cubic structure and the octahedrons-like structures gradually transform into nanotubes with the increase of the reaction time. The possible formation mechanism based on nucleation-dissolution–recrystallization of nanoparticles was proposed. It is found that there are Ce3+ ions and oxygen vacancies in surface of samples. All the samples exhibited similar emission peaks of room temperature photoluminescence and the emission intensity increases with the increase of concentration of oxygen vacancies. The M-H curves of CeO2 nano-octahedrons and nanotubes exhibit excellent room-temperature ferromagnetism, which is likely attributed to the effects of the Ce3+ ions and oxygen vacancies.
KeywordsCeO2 Oxygen Vacancy Na3PO4 CeO2 Nanoparticles CePO4
This work was supported by the National Natural Science Foundation of China (Nos. 51072002 and 51272003), Outstanding Young Talents Funded Projects of Suzhou University(Grant Nos. 2014XQNRL010), and the Natural Science Research Fund of Anhui Provincial Department of Education(KJ2016A775).
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