Synthesis and Magnetic Properties of Mn4Si7 and Si鈥揗n4Si7 Axial Heterostructure Nanowire Arrays

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• 作者：Hailong Liu ; Guangwei She ; Xing Huang ; Xiaopeng Qi ; Lixuan Mu ; Xiangmin Meng ; Wensheng Shi
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 7, 2013
• 年：2013
• 卷：117
• 期：5
• 页码：2377-2381
• 全文大小：289K
• 年卷期：v.117,no.5(February 7, 2013)
• ISSN：1932-7455

文摘

Manganese silicides nanostructures showed great potential applications in microelectronic and optoelectronic devices. In this study, Mn₄Si₇ and Si鈥揗n₄Si₇ axial heterostructure nanowire arrays were synthesized by the in-situ reaction between Si nanowire arrays and MnCl₂. Depending on the reaction durations and processes, structures (Mn₄Si₇ nanowires or Si鈥揗n₄Si₇ axial heterostructure nanowires) and lengths of the Mn₄Si₇ nanowires could be readily tuned. Phase identification were performed by the XRD, TEM, HRTEM, and SAED means, which results indicated that the as-synthesized nanowire is Nowotny chimney ladder (NCL) structure Mn₄Si₇ with a tetragonal structure. The Mn₄Si₇ nanowire arrays exhibited enhanced ferromagnetism comparing with other bulk higher manganese silicides. The Curie temperature of the Mn₄Si₇ nanowire arrays is over 300 K, which is much higher than that of the previous reports. Because of the good compatibility with Si-based nanowire devices and many favorable properties, these Mn₄Si₇ nanowire arrays have wide potential applications in the Si-based self-assembly nanowire devices.