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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Formation and Characterization of Femtosecond-Laser-Induced Subcluster Segregated Nanoalloys
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Formation and Characterization of Femtosecond-Laser-Induced Subcluster Segregated Nanoalloys

机译：飞秒激光诱导的亚团簇纳米合金的形成与表征

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摘要

We report the first synthesis of subcluster segregated nanoalloys formed through the joining of immiscible metallic nanoparticles (NPs) using femtosecond (fs) laser irradiation. Immiscible alloy components consisting of Ag and Ni, and Ag and Fe, all in the form of NPs, were first deposited on a carbon film in vacuum by fs laser ablation from the parent metals. These samples of randomly distributed NPs were then irradiated with multiple fs laser pulses at a fluence of 1.5 mJ/cm~2. Transmission electron microscopy (TEM) observations indicate that Ag and Ni as well as Ag and Fe NPs were successfully joined under these conditions. Energy dispersive X-ray (EDX) results show that no mixing layer exists at the interface. The nanostructure in the interface reveals the assumption of a specific angle between two matching planes on either side of the interface. Calculation of the lattice mismatch indicates that the system adjusts to this angle so as to reduce surface energy. Structural ledges were also formed at the interface to further compensate for the atomic misfit.
机译：我们报告了通过使用飞秒（fs）激光辐照的不混溶金属纳米颗粒（NPs）的加入形成的亚簇分离纳米合金的首次合成。首先，通过fs激光烧蚀从母体金属中，将全部由NP形式的，由Ag和Ni以及Ag和Fe组成的不混溶合金成分沉积在碳膜上。然后，以1.5 mJ / cm〜2的通量用多个fs激光脉冲辐照这些随机分布的NP样品。透射电子显微镜（TEM）的观察结果表明，在这些条件下，Ag和Ni以及Ag和Fe NPs已成功结合。能量色散X射线（EDX）结果表明，界面处不存在混合层。界面中的纳米结构揭示了在界面两侧的两个匹配平面之间存在特定角度的假设。晶格失配的计算表明系统调整到该角度以减少表面能。在界面处也形成了结构壁架，以进一步补偿原子错配。

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