Mn−Si-Catalyzed Synthesis and Tip-End-Induced Room Temperature Ferromagnetism of SiC/SiO2 Core−Shell Heterostructures

详细信息    查看全文

• 作者：Baodan Liu ; Yoshio Bando ; Chengchun Tang ; Masanori Mitome ; Kazunari Yamaura ; Eiji Takayama-Muromachi ; Dmitri Golberg
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：December 4, 2008
• 年：2008
• 卷：112
• 期：48
• 页码：18911-18915
• 全文大小：246K
• 年卷期：v.112,no.48(December 4, 2008)
• ISSN：1932-7455

文摘

SiC/SiO₂ heterostructures were synthesized with catalytic Mn−Si alloy particles via a simple thermal evaporation process. The inner SiC nanowires were crystalline and possessed cubic structures with a large number of structural defects. Outer amorphous 15 nm thick layers of SiO₂ were 40−100 nm in diameter. A novel peapod-like silica tubular structure encapsulating Mn−Si alloy particles was also discovered. Magnetic measurements revealed that the Mn−Si catalyzed SiC/SiO₂ nanocable heterostructures exhibited tip-end-induced room temperature ferromagnetism. It is believed that the Mn atoms not only played the role of catalyst, but were also responsible for the existing ferromagnetism at the heterostructure Mn−Si-alloy tip-ends. We envisage that the present novel structures, as well as their interesting magnetic properties, should find applications in a future nanodevice design.