Morphology-controllable synthesis and characterization of CeO2 nanocrystals

CeO2 nanocrystals with different morphologies were synthesized by adjusting the pH value of the starting solution in water-in-oil microemulsion. The obtained samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）. thermogravimetric analysis and different therma...

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Published in:Particuology 2011-04, Vol.9 (2), p.170-173
Main Authors: Huang, Yangfeng, Cai, Yebin, Qiao, Dongkai, Liu, Hao
Format: Article
Language:English
Subjects:
CeO2
可控
合成
形貌
氧化铈纳米晶
紫外可见光谱法
表征
透射电子显微镜
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creator Huang, Yangfeng
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Qiao, Dongkai
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description CeO2 nanocrystals with different morphologies were synthesized by adjusting the pH value of the starting solution in water-in-oil microemulsion. The obtained samples were characterized by transmission electron microscopy （TEM）, X-ray diffraction （XRD）. thermogravimetric analysis and different thermal analysis （TGA/DTA）, Brunauer-Emmet-Teller （BET） surface area measurement, ultraviolet-visible absorption （UV-vis） spectroscopy and photoluminescence （PL） spectroscopy. Results show that the mor- phologies of CeO2 were transformed from granular to spherical and to rod-like while the pH of the starting solution varied from 5 to 8 and to 11. All samples were indexed to the phase of Ce02 and Ce（OH）4, and the molar ratio of Ce02 to Ce（OH）4 was deduced to be about 0.25, The morphologies of CeO2 nanocrystals had but slight influence on their specific surface areas, UV-vis spectra and PL spectra, The band gap energies of different morphological samples were estimated by UV-vis spectroscopic method,
doi_str_mv 10.1016/j.partic.2010.07.023
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subjects CeO2
可控
合成
形貌
氧化铈纳米晶
紫外可见光谱法
表征
透射电子显微镜
title Morphology-controllable synthesis and characterization of CeO2 nanocrystals
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