Redox hydrothermal synthesis of cerium phosphate microspheres with different architectures

Redoxhydrothermal synthesis of cerium phosphate microspheres with different architectures

Ru Yang,*^a Jie Qin,^a Min Li,^a Yanhong Liu^a and Fei Li^a

* Corresponding authors

^a State Key Laboratory of Chemical Resource Engineering, Department of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China
E-mail: yangru@bbn.cn
Fax: +86-10-64436736
Tel: +86-10-64436736

Abstract

Uniform CePO₄ microspheres are first synthesized via a highly efficient redox hydrothermal (RHT) route using unconventional tetravalent Ce(SO₄)₂·4H₂O as the cerium source. Products obtained at 150 °C for 2h are hexagonal crystalline CePO₄ microspheres with diameters ranging from 2 to 5 μm. By tuning the hydrothermal reaction time from 0 to 96 h, the morphologies of the obtained products undergo evolution from rodlike to spherelike and then to lamellar spherelike and lamellar star-shaped particles, accompanied by the phase transition from monoclinic Ce(H₂O)(PO₄)₃_/₂(H₃O)₁_/₂(H₂O)₁_/2 to pure hexagonal CePO₄ and then to mixed phases of hexagonal and monoclinic CePO₄. A possible growth mechanism based on dissolution–recrystallization was proposed. The photoluminescence properties were investigated and these CePO₄ microspheres exhibit a narrower emission than that of CePO₄ nanoparticles. In addition, Ln³⁺ (Ln = Eu, Dy, and Tb) doped CePO₄ microspheres were also prepared, and their photoluminescent properties were studied.

Article information

https://doi.org/10.1039/C1CE05368J

Article type

Paper

Submitted

27 Mar 2011

Accepted

15 Jul 2011

First published

10 Oct 2011

Download Citation

CrystEngComm, 2011,13, 7284-7292

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