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A general aqueous sol-gel route to Ln(2)Sn(2)O(7) nanocrystals

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

Abstract

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.

Item Type:Article
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
ID Code:6153
Deposited By:IoN
Deposited On:01 Apr 2010 16:58
Last Modified:01 Apr 2010 16:58

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