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Metallic and Ionic Fe Induced Growth of Si−SiOx Core−Shell Nanowires

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journal contribution
posted on 16.09.2010, 00:00 by Tian-Xiao Nie, Zhi-Gang Chen, Yue-Qin Wu, Jia-Le Wang, Jiu-Zhan Zhang, Yong-Liang Fan, Xin-Ju Yang, Zui-Min Jiang, Jin Zou
Si−SiOx core−shell nanowires with a length of hundreds of micrometers and average diameters of 40−90 nm were fabricated by directly heating Si wafers coated with metallic Fe. These novel core−shell nanowires have a diamond structure for their ultrathin Si cores with a diameter of 5−8 nm aligned along the ⟨111⟩ growth directions inside much thicker amorphous SiOx shells. A new temperature-dependent alloy, metallic and ionic Fe (Fe−FeOx), catalyzed solid−liquid−solid mechanism is proposed to explain the growth of Si−SiOx core−shell nanowires based on both the synthesis conditions and microstructural characterizations.