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Systematic Synthesis of Lanthanide Phosphate Nanocrystals
Author(s) -
Huo Ziyang,
Chen Chen,
Chu Deren,
Li Haohang,
Li Yadong
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200601727
Subject(s) - nanocrystal , nucleation , luminescence , raman spectroscopy , materials science , lanthanide , photoluminescence , transmission electron microscopy , solvent , chemical engineering , hydrothermal circulation , crystallography , nanotechnology , chemistry , organic chemistry , ion , optics , physics , optoelectronics , engineering
Uniform LnPO 4 ⋅ x H 2 O (Ln=Y, La–Nd, Sm–Lu) nanocrystals that have controllable 0D (spherelike), 1D (rodlike), and 2D (polygonlike) structures have been systematically synthesized by means of a hydrothermal method by using a mixed solvent of water and ethanol. Transmission electron microscopy images and SEAD (selected area electron diffraction) patterns revealed that the products are highly crystalline and have structurally uniform shapes. IR, Raman, and electron energy loss spectroscopies gave spectra that indicated that an amount of oleic acid molecules were presented at the surface of individual nanocrystals. These nanocrystals have hydrophobic surfaces and could be easily dispersed in nonpolar solvents. Moreover, a creditable synthetic mechanism for nucleation, growth, and shape evolution has been proposed. Eu 3+ doped products were also prepared by using the same synthetic process. The Eu 3+ doped products exhibited an orange‐red luminescence that is ascribed to an electron transition within the 4f shell. Analysis of the photoluminescent spectra revealed that the optical properties are strongly dependent on their morphologies.