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Synthesis and Characterization of Hexagonal Shaped Nanocrystalline Zinc Oxide Powders
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Author(s): M. Ahmad (B. Z. University, Multan, Pakistan), E. Ahmed (B. Z. University, Multan, Pakistan), N. R. Khalid (B. Z. University, Multan, Pakistan), M. J. Jackson (Bonded Abrasive Consultancy Group, USA)and W. Ahmed (University of Central Lancashire, UK)
Copyright: 2014
Pages: 14
Source title:
Nanotechnology: Concepts, Methodologies, Tools, and Applications
Source Author(s)/Editor(s): Information Resources Management Association (USA)
DOI: 10.4018/978-1-4666-5125-8.ch008
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Abstract
Nanocrystalline ZnO powders are synthesized using a quick, simple and inexpensive combustion method. Glycine and zinc nitrate, used as fuel and oxidant/cation sources respectively, were mixed together at room temperature to form a slurry or gel. A series of experiments were performed to synthesize nanoparticles for different fuel to oxidant ratios. The rate of heating and stirring greatly influenced the combustion process. The as-synthesized powder was heat treated at elevated temperatures for varying time to remove adsorbed impurities from the surface of the ZnO nanoparticles. Both the as-synthesized and heat treated powders were characterized using a variety of analytical techniques. The hexagonal wurtzite phase of the ZnO powder was revealed from x-ray diffraction measurements. A decrease in the x-ray diffraction density (Dx) and the bulk density (D) resulted in an increase in percentage porosity (%P) of as-synthesized and heat treated ZnO powders. The range of fuel to oxidant ratios used in the present work indicates that they had a strong influence on the grain size of ZnO powders. The average grain size estimated by using the Scherer formula indicated an approximate value of 6-21 nm for the as-synthesized and heat treated samples.
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