Controlled synthesis of Ce(OH)CO3 flowers by a hydrothermal method and their thermal conversion to CeO2 flowers

[Display omitted] ► Ce(OH)CO3 flowers were prepared in a water–N2H4 complex. ► Influences of the N2H4 content and temperature on flower formation were discussed. ► CeO2 flowers were prepared by thermal conversion of Ce(OH)CO3 flowers at 500°C. ► The Eg of CeO2 flowers is 2.66eV, and lower than that...

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Published in:Particuology 2012-12, Vol.10 (6), p.771-776
Main Authors: Zhang, Dongen, Li, Feng, Gu, Jian, Xie, Qing, Li, Shanzhong, Zhang, Xiaobo, Han, Guiquan, Ying, Ailing, Tong, Zhiwei
Format: Article
Language:English
Subjects:
Band spectra
Conversion
Crystal growth
Diffraction
Energy gap
Flowers
Scanning electron microscopy
Self-assembly
Synthesis
X-rays
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Summary:[Display omitted] ► Ce(OH)CO3 flowers were prepared in a water–N2H4 complex. ► Influences of the N2H4 content and temperature on flower formation were discussed. ► CeO2 flowers were prepared by thermal conversion of Ce(OH)CO3 flowers at 500°C. ► The Eg of CeO2 flowers is 2.66eV, and lower than that of bulk ceria. Highly uniform Ce(OH)CO3 flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce(NH4)(NO3)4 with CO(NH2)2 at 160°C in a water–N2H4 complex. The influences of the N2H4 content and temperature on flower formation were discussed. CeO2 flowers were prepared by thermal conversion of Ce(OH)CO3 flowers at 500°C in air. Both Ce(OH)CO3 and CeO2 flowers were characterized by X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The UV–vis adsorption spectrum of the CeO2 flowers showed that the band gap energy (Eg) is 2.66eV, which is lower than that of bulk ceria.
ISSN:1674-2001
2210-4291
DOI:10.1016/j.partic.2012.01.004