Abstract
The hexagonal prism-like CeO2 nanotubes have been successfully synthesized via a facile hydrothermal method using Ce(OH)CO3 hierarchical structures as precursors. X-ray diffraction inferred that the synthesized CeO2 nanotubes exhibited a fluorite cubic structure. The scanning electron microscope and transmission electron microscope revealed that the CeO2 samples have a hexagonal tube-like structure, while bundle-like hierarchical structure was obtained in original solution. X-ray photoelectron spectroscopy and the Raman spectroscopy reflected the existence of the oxygen vacancies and Ce3+ ions in the hexagonal CeO2 nanotubes. There is a red-shifting in the band gap of the material compared to bulk one, which is mainly attributed to the influences of the Ce3+ ions, oxygen vacancies and the novel morphology.
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