Ni/Ni3C core-shell nanochains and its magnetic properties:: One-step synthesis at low temperature
Ni/Ni3C core-shell nanochains and its magnetic properties:: One-step synthesis at low temperature
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DOI：
10.1021/nl073291j
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发表时间：
2008-04-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Ze
中科院分区：
文献类型：
--
作者：
Zhou, Wei;Zheng, Kun;Zhang, Ze
以氧化三辛基膦（TOPO）为软模板，采用温和化学溶液法制备了平均直径约为30 nm的一维Ni/Ni3C核壳纳米球链。结果表明，均匀的Ni纳米链上覆盖着厚度约为1 ~ 4nm的Ni3C薄壳，每个Ni核由多晶组成。由于核壳纳米链的一维形状各向异性，其矫顽力大大增强（5k时为600 Oe），与单镍纳米线相当。从Ni核和Ni3C壳的独特结构来看，这种结构可能具有双重功能。这种独特的结构也有助于一维磁性纳米结构磁化反转机理的研究。
One-dimensional Ni/Ni3C core-shell nanoball chains with an average diameter by around 30 nm were synthesized by means of a mild chemical solution method using a soft template of trioctylphosphine oxide (TOPO). It was revealed that the uniform Ni nanochains were capped with Ni3C thin shells by about 1-4 nm in thickness and each Ni core consists of polygrains. The coercivity of the core-shell nanochains is much enhanced (600 Oe at 5 K) and comparable with single Ni nanowires due to the one-dimensional shape anisotropy. Deriving from the distinctive structure of Ni core and Ni3C shell, this architecture may possess a possible bifunctionality. This unique architecture is also useful for the study on the magnetization reversal mechanism of one-dimensional magnetic nanostructure.