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Citation: YANG Li-Ge, ZHOU Bo, LU Tian-Hong, CAI Chen-Xin. Hydrothermal Synthesis and Fluorescence Properties of Cerium Phosphate Nanomaterials with Different Crystal Structures[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 697-701. shu

Hydrothermal Synthesis and Fluorescence Properties of Cerium Phosphate Nanomaterials with Different Crystal Structures

1.
Jiangsu Key Laboratory of Biofunctional Materials, College of Chemistry and Environmental Science, Nanjing Normal University, Nanjing 210097

Corresponding author: CAI Chen-Xin,
Received Date: 1 September 2007
Available Online: 11 November 2007
Fund Project: 国家自然科学基金(20373027,20673057,20773065) (20373027,20673057,20773065)"新世纪优秀人才支持计划"(NET-06-0508) (NET-06-0508)江苏省自然科学基金(BK2005138) (BK2005138)江苏省高校自然科学基金(06KJB150061)资助项目 (06KJB150061)

CePO₄ fluorescence nanomaterials with different crystal structures and morphology was hydrothermally synthesized and characterized with the techniques of X-ray diffraction (XRD),transmission electron microscopy (TEM),scanning electron microscopy (SEM) and fluorescence spectroscopy,etc.The effects of pH and temperature on the crystal structure,morphology and fluorescent intensity of CePO₄ were investigated.The SEM results indicated that CePO₄ prepared in acidic solution (pH=1,120℃) were nanorods,while CePO₄ prepared in alkaline solution (pH=12,120℃) were nanoparticles.The XRD results showed that CePO₄ prepared in acidic (pH=1,120℃) solution had a hexagonal crystal structure.However,the crystallinity of CePO₄ obtained in the acidic solution was better than that of CePO₄ obtained in the alkaline solution.The crystal structure of CePO₄ depended on the preparation temperature.The CePO₄ had a hexagonal crystal structure when it was prepared at 120℃ and pH=1.CePO₄ with monoclinic and hexagonal crystal structures can be simultaneously formed with increasing the preparation temperature.Only CePO₄ with the monoclinic structure was obtained when the temperature was 200℃.Fluorescence spectra indicated that both hexagonal and monoclinic CePO₄ showed a broad emission band at between 300~400 nm due to the 5d-4f emission of cerium.However,the fluorescence intensity of the monoclinic CePO₄ was stronger than that of hexagonal one.
- nanomaterials,
- hydrothermal synthesis,
- crystal structure,
- fluorescence,
- CePO₄
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