Growth and Structure of Mg-Al Spinel Nanodonut-Decorated MgO Nanowires

Title
Growth and Structure of Mg-Al Spinel Nanodonut-Decorated MgO Nanowires
Authors
김현우
Keywords
composites; fibers; chemical synthesis; scanning electron microscopy (SEM); transmission electron microscopy (TEM)
Issue Date
2015-08
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v. 21, NO 5, Page. 956-961
Abstract
We report the growth of MgO nanowires surrounded by a donut-shaped spinel in a periodic way at a particular growth temperature of 1,000 degrees C. We examined the samples by means of scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and X-ray diffraction. At a lower temperature 950 degrees C, regular MgO nanowires grow. In contrast, at a higher temperature of 1,050 degrees C, spinel of (Mg0.4Al0.6)Al1.8O4 nanowires grow. From the absence of tip nanoparticles, we suggest that the synthesis of nanowires in the present study is dominated by a base-growth process. Based on the thermochemistry calculations, we propose that the absence of spinel in samples equilibrated at 950 degrees C is due to the catalytic-like behaviors of the silicon substrate which promotes the formation of MgO. In terms of choosing appropriate source materials, the technique reported here can be extended and exploited to produce various combinations of nanowire backbone structure with a surrounded nano-scale disk.
URI
https://link.springer.com/article/10.1007%2Fs12540-015-4443-5http://hdl.handle.net/20.500.11754/26872
ISSN
1598-9623; 2005-4149
DOI
http://dx.doi.org/10.1007/s12540-015-4443-5
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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