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Growth Kinetic and Characterization of Mg x Zn1−x O Nanoneedles Synthesized by Thermal Oxidation

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Mg x Zn1−x O nanoneedles were synthesized on alumina substrate by using thermal oxidation technique under normal atmosphere. Zn powder and MgO powder were mixed and heated to form Mg x Zn1−x O with x content of 0–0.3 by mol at heating temperature and time of 400–1000 °C and 24 h. The morphology of Mg x Zn1−x O nanoneedle was characterized by filed emission scanning electron microscope (FE-SEM). It was found that the needle-like nanostructures with the sharp ends were observed outward from microparticles at 400–800 °C. From EDS, XRD, and TEM analysis, it was suggested that Mg x Zn1−x O alloy was formed with no segregation of MgO in Mg x Zn1−x O alloy after thermal oxidation process. Also, from reflectance spectra, the Mg x Zn1−x O nanoneedle exhibited higher energy gap than that of ZnO films for entire Mg content indicating widening band gap energy due to alloying effect. Moreover, we have proposed the growth mechanism of Mg x Zn1−x O nanoneedles based on growth kinetic of nucleation formation. This growth model can be explored to explain nanostructure of other metal-oxide alloy prepared by thermal oxidation.


Document Type: Research Article


Publication date: 2011-10-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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