First synthesis by liquid-liquid phase transfer of magnetic CoxPt100-x nanoalloys.
First synthesis by liquid-liquid phase transfer of magnetic CoxPt100-x nanoalloys.
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DOI：
10.1021/la700719h
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发表时间：
2007-06
期刊：
影响因子：
--
通讯作者：
Arnaud Demortière;Christophe Petit
中科院分区：
文献类型：
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作者：
Arnaud Demortière;Christophe Petit
具有已知尺寸和成分的磁性纳米粒子的受控合成始终是一个挑战。开发了一种软化学合成方法以获得具有高能力控制成分、尺寸和多分散性的磁性合金纳米晶体。采用胶体法通过液-液相转移法合成了钴铂合金纳米晶。使用 HRTEM 和 XRD 对钴成分范围为 25-75% 的纳米晶体进行结构表征，表明形成了纳米合金双金属 CoxPt100-x。调整烷基胺封端剂和还原过程的动力学可以将尺寸调整在 1.8-4 nm 范围内，同时保持等原子组成。窄的尺寸分布导致了在长范围内诱导纳米颗粒自组织的可能性。研究了不同纳米颗粒尺寸下无序面心立方相 A1 中 Co50Pt50 纳米合金的磁性能。
Controlled synthesis of magnetic nanoparticles with a well-known size and composition is always a challenge. A soft chemical synthesis was developed to obtain magnetic alloy nanocrystals with a high ability to control composition, size, and polydispersity. Cobalt-platinum alloy nanocrystals were synthesized using a colloidal approach by the liquid-liquid phase transfer method. Structural characterization using HRTEM and XRD was carried out on nanocrystals in the range of 25-75% cobalt composition, which indicated the formation of nanoalloy bimetallic CoxPt100-x. Adjusting the alkylamine capping agent and the kinetics of the reduction process allowed tuning of the size in the range of 1.8-4 nm while keeping an equiatomic composition. The narrow size distribution led to the possibility of inducing nanoparticle self-organization over a long range. The magnetic properties of the Co50Pt50 nanoalloy in the disordered face-centered cubic phase A1 were studied for different nanoparticle sizes.