Cheng, Hua and Wang, Liping and Lu, Zhouguang (2008) A general aqueous sol-gel route to Ln(2)Sn(2)O(7) nanocrystals. NANOTECHNOLOGY, 19 (2).
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Official URL: http://www.iop.org/EJ/abstract/-search=66091735.1/...
This paper describes a general aqueous sol-gel route for the synthesis of a series of rare earth stannates, Ln(2)Sn(2)O(7) ( Ln = Y, La, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb and Lu), with pure pyrochlore phase via the assistance of a cetyltrimethyl ammonium bromide (CTAB) surfactant. The route involves first the formation of CTAB-inorganic lamellar structures and then their thermal decomposition at 800 degrees C to yield the pyrochlore Ln(2)Sn(2)O(7) nanocrystals. Techniques using a thermo-gravimetric/differential thermal analyzer (TG-DTA), x-ray diffraction (XRD) and transmission electron microscopy (TEM) as well as selected-area electron diffraction (SAED) have been employed to characterize the as-synthesized Ln(2)Sn(2)O(7) nanocrystals. Furthermore, photoluminescence (PL) of the 5% Eu3+ activated Ln(2)Sn(2)O(7) nanocrystals and carbon monoxide catalytic oxidation over the as-obtained Ln(2)Sn(2)O(7) nanocrystals were investigated. The results indicate that the PL properties as well as the catalytic activity changes significantly with the ionic radii of the rare earth elements.
|Uncontrolled Keywords:||EU3+-DOPED Y2SN2O7 NANOCRYSTALS; RARE-EARTH IONS; PYROCHLORE OXIDES; HYDROTHERMAL SYNTHESIS; STANNATE PYROCHLORE; OPTICAL-PROPERTIES; CERAMIC PIGMENTS; BOND-ENERGY; LUMINESCENCE; CRYSTAL|
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanofabrication processes and tools
|Deposited On:||24 Sep 2009 12:39|
|Last Modified:||24 Sep 2009 12:39|
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