Magnetic Fe2P nanowires and Fe2P@C core@shell nanocables
Magnetic Fe2P nanowires and Fe2P@C core@shell nanocables
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DOI：
10.1007/s12274-010-1024-2
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发表时间：
2010-05
期刊：
影响因子：
9.9
通讯作者：
Junli Wang;Qing Yang;Jun Zhou;Kewen M Sun;Zude Zhang;Xia Feng;Tanwei Li
中科院分区：
文献类型：
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作者：
Junli Wang;Qing Yang;Jun Zhou;Kewen M Sun;Zude Zhang;Xia Feng;Tanwei Li
本文报道了在380-400 °C真空密封的安瓿中，三苯基膦（PPh 3）分别与铁粉（颗粒）和二茂铁（Fe（5 H5）2）反应，合成一维磁性Fe 2 P纳米线和Fe2P@C核壳纳米电缆。该合成基于通过在高温下从液体PPh 3中提取磷将微米或纳米尺寸的Fe颗粒化学转化为Fe 2 P。为了控制产物的直径，采用了一种方便的突然升温策略，通过该策略，由分子前体Fe（C5 H5）2制备了直径均匀的Fe2P@C纳米电缆。相比之下，该策略对使用元素Fe作为铁前体获得的Fe 2 P纳米线的直径没有明显的控制。一维Fe 2 P纳米结构的形成归因于动力学诱导的各向异性生长和六方Fe 2 P晶体的固有各向异性性质的协同作用。所得的Fe 2 P纳米线和Fe2P@C纳米电缆显示有趣的铁磁-顺磁转变行为，阻断温度分别为230和268 K，显著高于体Fe 2 P的铁磁转变温度（TC= 217 K）。
We report the synthesis of one-dimensional (1-D) magnetic Fe2P nanowires and Fe2P@C core@shell nanocables by the reactions of triphenylphosphine (PPh3) with Fe powder (particles) and ferrocene (Fe(5H5)2), respectively, in vacuum-sealed ampoules at 380–400 °C. The synthesis is based on chemical conversion of micrometer or nanometer sized Fe particles into Fe2P via the extraction of phosphorus from liquid PPh3at elevated temperatures. In order to control product diameters, a convenient sudden-temperature-rise strategy is employed, by means of which diameter-uniform Fe2P@C nanocables are prepared from the molecular precursor Fe(C5H5)2. In contrast, this strategy gives no obvious control over the diameters of the Fe2P nanowires obtained using elemental Fe as iron precursor. The formation of 1-D Fe2P nanostructures is ascribed to the cooperative effects of the kinetically induced anisotropic growth and the intrinsically anisotropic nature of hexagonal Fe2P crystals. The resulting Fe2P nanowires and Fe2P@C nanocables display interesting ferromagnetic-paramagnetic transition behaviors with blocking temperatures of 230 and 268 K, respectively, significantly higher than the ferromagnetic transition temperature of bulk Fe2P (TC= 217 K).