Ferromagnetic Fe@CaS Nanopeapods with Protecting BN Tubular Sheaths

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• 作者：Jing Lin ; Yang Huang ; Chengchun Tang ; Yoshio Bando ; Youguo Shi ; Eiji. Takayama-Muromachi ; Dmitri Golberg
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 20, 2009
• 年：2009
• 卷：113
• 期：33
• 页码：14818-14822
• 全文大小：264K
• 年卷期：v.113,no.33(August 20, 2009)
• ISSN：1932-7455

文摘

Novel one-dimensional nanohybrids made of Fe@CaS nanopeapods homogeneously coated with protecting boron nitride sheaths are synthesized through a solid−liquid−solid reaction at 1500 °C. Within the nanopeapods, discrete Fe nanoparticles with an average size of 90 nm are periodically embedded in CaS nanowires along the growth axes. The structures have diameters of 150−180 nm and lengths in the range of tens of micrometers. Detailed electron microscopy studies reveal a unique stacking sequence of nanopeapods and the protecting tubular BN sheaths on them with a uniform thickness of 3 nm. Magnetic measurements show that nanopeapods are ferromagnets at room temperature with a coercive force of 64 Oe. These novel nanostructures may not only enrich the existing bank of hybrid nanosystems but may also have high expectations for magnetic−optical and spintronic devices.