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首页> 外文期刊>Chemistry: A European journal >Phase-controlled synthesis of transition-metal phosphide nanowires by ullmann-type reactions
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Phase-controlled synthesis of transition-metal phosphide nanowires by ullmann-type reactions

机译：ullmann型反应的相控合成过渡金属磷化物纳米线

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摘要

Transition-metal phosphide nanowires were facilely synthesized by Ullmann-type reactions between transition metals and triphenylphosphine in vacuum-sealed tubes at 350-4000C. The phase (stoichiometry) of the phosphide products is controllable by tuning the metal/PPh_3 molar ratio and concentration, reaction temperature and time, and heating rate. Six classes of iron, cobalt, and nickel phosphide (Fe_2P, FeP, Co_2P, CoP, Ni_2P, and NiP_2) nanostructures were prepared to dem-onstrate the general applicability of this new method. The resulting phosphide nanostructures exhibit interesting phase- and composition-dependent magnetic properties, and magnetic measurements suggested that the Co _2P nanowires with anti-PbCl_2 structure show a ferromagnetic-paramagnetic transition at 6 K, while the MnP-structured CoP nanowires are paramagnetic with Curie-Weiss behavior. Moreover, GC-MS analyses of organic byproducts of the reaction revealed that thermally generated phenyl radicals promoted the formation of transition-metal phosphides under synthetic conditions. Our work offers a general method for preparing one-dimensional nanoscale transition-metal phosphides that are promising for magnetic and electronic applications.
机译：过渡金属磷化物纳米线是通过在350-4000C的真空密封管中通过过渡金属与三苯基膦之间的Ullmann型反应轻松合成的。可以通过调节金属/ PPh_3的摩尔比和浓度，反应温度和时间以及加热速率来控制磷化物产物的相（化学计量）。制备了六类铁，钴和磷化镍（Fe_2P，FeP，Co_2P，CoP，Ni_2P和NiP_2）纳米结构，以证明这种新方法的一般适用性。所得的磷化物纳米结构表现出有趣的相位和组成相关的磁性，磁性测量表明，具有抗PbCl_2结构的Co _2P纳米线在6 K时显示出铁磁-顺磁转变，而MnP结构的CoP纳米线与居里顺磁性-魏斯的行为。此外，GC-MS分析反应的有机副产物表明，在合成条件下，热生成的苯基自由基促进了过渡金属磷化物的形成。我们的工作为制备一维纳米级过渡金属磷化物提供了一种通用方法，该方法有望用于磁性和电子应用。

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