Nano Archive

Periodically twinned SiC nanowires

Wang, Dong-Hua and Wang, Dixu Qing and Hao, Ya-Juan and Jin, Guo-Qiang and Guo, Xiang-Yun and Tu, K. N. (2008) Periodically twinned SiC nanowires. NANOTECHNOLOGY, 19 (21).

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Twinning has been recognized to be an important microstructural defect in nanoscale materials. Periodically twinned SiC nanowires were largely synthesized by the carbothermal reduction of a carbonaceous silica xerogel prepared from tetraethoxysilane and biphenyl with iron nitrate as an additive. The twinned beta-SiC nanowires, with a hexagonal cross section, a diameter of 50-300 nm and a length of tens to hundreds of micrometers, feature a zigzag arrangement of periodically twinned segments with a rather uniform thickness along the entire growth length. Computer simulation has been used to generate three-dimensional atomic structures of the zigzag columnar twin structure by the stacking of hexagonal discs of {111} planes of SiC. A minimum surface energy and strain energy argument is proposed to explain the formation of periodic twins in the SiC nanowires. The thickness of the periodic twinned segments is found to be linearly proportional to the nanowire diameter, and a constant volume model is proposed to explain the relation.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
ID Code:2390
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 12:43
Last Modified:20 Jan 2009 10:31

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