Rod and sphere-like CeO2 particles were obtained via a supercritical solvothermal method using CeCl3.7H2O and Ce(NO3)3.6H2O as cerium sources in ethanol and methanol at 400 °C for 15 min followed by calcination in air. The rodlike particles were 200-400 nm in diameter and 1-2 μm in length. The spherical particles were 300-500 nm in diameter. The as-prepared rodlike particles using CeCl3. 7H2O consisted of mixtures of Ce(OH)3 and Ce(CH3COO)3 and were converted to rodlike CeO 2 by calcination in air at 500 °C. In contrast, the spherical particles prepared using Ce(NO3)3.6H2O consisted of fluorite-structured CeO2. The possible formation mechanism was discussed on the basis of the effect of reaction time on the morphology at 400 °C. The rod- and spherelike CeO2 particles exhibited strong UV absorption below 400 nm, and the absorbance edges extend to nearly 500 nm. The rod- and spherelike CeO2 particles exhibited near-UV emission at 360 nm and blue emission at 465 nm with higher emission intensity compared to the commercial CeO2 sample.
|Number of pages||5|
|Journal||ACS Applied Materials and Interfaces|
|Publication status||Published - 2009 Nov 25|
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