Ni/Ni3C Core–Shell Nanochains and Its Magnetic Properties: One-Step Synthesis at Low Temperature

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• 作者：Wei Zhou ; Kun Zheng ; Lin He ; Rongming Wang ; Lin Guo ; Chinping Chen ; Xiaodong Han ; Ze Zhang
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：8
• 期：4
• 页码：1147 - 1152
• 全文大小：1487K
• 年卷期：v.8,no.4(April 2008)
• ISSN：1530-6992

文摘

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.