Halide Ion-Mediated Synthesis of L10-FePt Nanoparticles with Tunable Magnetic Properties
Halide Ion-Mediated Synthesis of L10-FePt Nanoparticles with Tunable Magnetic Properties
复制标题
卤化物离子介导合成具有可调磁性能的 L1(0)-FePt 纳米颗粒
DOI：
10.1021/acs.nanolett.8b03603
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发表时间：
2018-12-01
期刊：
影响因子：
10.8
通讯作者：
Chen, Dafa
中科院分区：
文献类型：
--
作者：
Lei, Wenjuan;Xu, Junjie;Chen, Dafa
L1(0)-FePT纳米粒子(NPs)在先进的磁性和催化应用领域具有巨大的潜力。在此，我们提出了一种简便的合成硬磁L1(0)-FePtNPs的控制路线，在合成过程中加入卤离子(Cl-、Br2-或I-)以促进相变。结果表明，卤化物离子与Fe3+或Pt2+离子之间较强的离子结合力有助于形成L1(0)-FePt相，这是因为卤化物离子以更稳定的热力学方式有利于FePt纳米粒子的生长，从而使其形成有序结构。通过控制卤化物离子的掺杂量，可以直接得到室温下的最高矫顽力为8.64kOe，饱和磁化强度为64.21emu/g的L1(0)-FePt纳米粒子。与传统的溶液相还原方法相比，卤化物离子辅助方法显示出更强的调节硬磁双金属纳米颗粒，特别是铂基双金属纳米颗粒的生长的能力。
L1(0)-FePt nanoparticles (NPs) have great potential in areas of advanced magnetic and catalytic applications. Here, we present a facile control route for synthesis of hard magnetic L1(0)-FePt NPs in which halide ions (Cl-, Br-, or I-) were added to the synthetic process to promote the phase transformation. It is confirmed that the strong ionic binding force between halide ions and Fe3+ or Pt2+ ions could facilitate the formation of L1(0)-FePt phase due to favoring growth of FePt NPs in a more thermodynamically stable way, which enables the formation of an ordered structure. L1(0)-FePt NPs with the highest coercivity of 8.64 kOe and saturation magnetization of 64.21 emu/g at room temperature can be directly obtained by controlling the amount of the halide ions. In comparison with conventional solution phase reduction methods, the halide ion-assisted method shows enhanced capability to tune the growth of hard magnetic bimetallic NPs, particularly Pt-based bimetallic NPs.