期刊
CERAMICS INTERNATIONAL
卷 39, 期 3, 页码 2811-2819出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.09.050
关键词
Milling; Powders: Chemical precipitation; Optical properties; ZnO
资金
- Thailand Research Fund (TRF) [MRG5480072]
- Office of the Higher Education Commission
- Prince of Songkla University
The synthetic method used for preparing ZnO nanoparticles strongly influenced the products obtained. The ZnO powders incorporated more La when prepared by the mechanical milling method whereas the La2O3/ZnO composite nanoparticles were formed better using the precipitation method. The phase formations were detected by the X-ray diffraction technique and the morphology of the samples was followed by scanning electron microscopy. The La contents affected the crystallite size. This was explained by the formation of La-O-Zn on the surface of the samples and by the Zener pinning effect. The band gap energy of the samples was influenced by repulsion between the valence and conduction bands and the presence of a secondary phase. The photocatalytic degradation of a methylene blue solution by the samples depended upon the number of oxygen vacancies. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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