Composition-Tuned ConSi Nanowires: Location-Selective Simultaneous Growth along Temperature Gradient

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• 作者：Kwanyong Seo ; Sunghun Lee ; Hana Yoon ; Juneho In ; Kumar S. K. Varadwaj ; Younghun Jo ; Myung-Hwa Jung ; Jinhee Kim ; Bongsoo Kim
• 刊名：ACS Nano
• 出版年：2009
• 出版时间：May 26, 2009
• 年：2009
• 卷：3
• 期：5
• 页码：1145-1150
• 全文大小：419K
• 年卷期：0
• ISSN：1936-086X

文摘

We report the simultaneous and selective synthesis of single-crystalline Co_nSi NWs (n = 1−3) and their corresponding crystal structures—simple cubic (CoSi), orthorhombic (Co₂Si), and face-centered cubic (Co₃Si)—following a composition change. Co_nSi NWs were synthesized by placing the sapphire substrates along a temperature gradient. The synthetic process is a successful demonstration of tuning the chemical composition in Co_nSi NWs. The synthesis and detailed crystal structure of single-crystalline Co₂Si and Co₃Si are reported for the first time including the bulk and the nanostructure phases. The electrical and magnetic properties of Co₂Si NWs are investigated and compared with those of CoSi NWs.