Cheng, Hua and Wang, Liping and Lu, Zhouguang (2007) A general aqueous sol-gel route to Ln(2)Sn(2)O(7) nanocrystals. NANOTECHNOLOGY, 19 (2).
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Official URL: http://iopscience.iop.org/0957-4484/19/2/025706
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:||Condensed matter: electrical, magnetic and optical Condensed matter: structural, mechanical & thermal Nanoscale science and low-D systems|
|Subjects:||Physical Science > Nanophysics|
Material Science > Nanostructured materials
|Deposited On:||01 Apr 2010 16:58|
|Last Modified:||01 Apr 2010 16:58|
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