Volume 10 Issue 6
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Zhang, D., Li, F., Gu, J., Xie, Q., Li, S., Zhang, X., Han, G., Ying, A., & Tong, Z. (2012). Controlled synthesis of Ce(OH)CO3 flowers by a hydrothermal method and their thermal conversion to CeO2 flowers. Particuology, 10(6), 771–776. https://doi.org/10.1016/j.partic.2012.01.004
Controlled synthesis of Ce(OH)CO3 flowers by a hydrothermal method and their thermal conversion to CeO2 flowers
Dongen Zhang a c, Feng Li b, Jian Gu a, Qing Xie a, Shanzhong Li a, Xiaobo Zhang a, Guiquan Han a, Ailing Ying a, Zhiwei Tong a c *
a Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
b College of Chemistry, China University of Mining and Technology, Xuzhou 221116, China
c SORST, Japan Science and Technology Agency (JST), Japan
10.1016/j.partic.2012.01.004
Volume 10, Issue 6, December 2012, Pages 771-776
Received 11 August 2011, Revised 9 January 2012, Accepted 30 January 2012, Available online 13 April 2012.
E-mail: zdewxm@yahoo.com.cn

Highlights

► 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 2.66 eV, and lower than that of bulk ceria.

Abstract

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 2.66 eV, which is lower than that of bulk ceria.

Graphical abstract
Keywords
Crystal growth; Flowers; Self-assembly