Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 556, Issue -, Pages 102-108Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.12.096
Keywords
Nanostructures; Electron microscopy; X-ray photo-emission spectroscopy; Optical properties
Categories
Funding
- Scientific Research Foundation of Education Ministry of Anhui Province of China [KJ2011A010, KJ2012A029]
- Anhui Provincial Natural Science Foundation of China [1208085ME81]
- EPSCoR
- Office Of The Director [1003970] Funding Source: National Science Foundation
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Morphology control of CeO2 nanostructures was achieved by using ethanol/water mixtures with varied volume ratios from 0:1 to 1:0 in a facile hydrothermal process with CeCl3 center dot 7H(2)O as cerium source and N2H4 center dot H2O as mineralizer. It was found that the increase of ethanol/water ratio resulted in the morphology change from thin nanorods to short-thick nanorods, and then to nanoparticles, which is mainly attributed to the influences of hydrocarbon chains, dielectric constant, and viscosity of the solution on the thermodynamics of the reaction system and kinetics of nucleation. Various characterization techniques have been used to study the CeO2 nanostructures, including XRD, XPS, SEM, HRTEM, Raman, and PL spectra. Photoluminescence spectra of the CeO2 nanoparticals exhibited an unique UV-violet-blue emission which is likely associated with the defect states existing extensively between Ce 4f and O 2p bands, better crystallinity of the sample, and higher concentration of Ce3+ ions in sample. (C) 2013 Elsevier B. V. All rights reserved.
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