低能氩粒子撞击下类janus纳米团簇核壳结构的形成

D. Shyrokorad, G. Kornich
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引用次数: 0

摘要

用分子动力学方法模拟了390个原子组成的自由类janus Cu-Au和Cu-Bi团簇在氩气弹丸撞击后100和500 ps的演化过程。用能量为0.05 ~ 1.4 keV的ar1和ar13粒子轰击目标。与Ar1相比,ar13撞击导致的簇温度升高了几倍,溅射收率提高了一个数量级。在300 eV ar13粒子轰击Cu-Bi的情况下,诱导形成以Cu核和Bi壳为主的核壳结构团簇;随着近表层Au浓度的增加,纳米Cu-Au颗粒趋向于形成接近均匀的混合物。ar1轰击引起的原子位移较小,导致Cu-Bi团簇中偏心富集的铜芯和Cu-Au团簇中不均匀的混合物,内部金浓度更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Formation of the Core-Shell Structures from Janus-Like Nanoclusters Under Low-Energy Argon Particles Impacts
100 and 500 ps evolution of free Janus-like Cu-Au and Cu-Bi clusters, which consisted of 390 atoms, after the impacts with argon projectiles was simulated using the method of molecular dynamics. Ar1and Ar13particles with energies from 0.05 to 1.4 keV were used for bombardment of the target. Ar13impacts induced a few times higher cluster temperatures and an order of magnitude higher sputtering yields as compared to Ar1. For the case of 300 eV Ar13particle bombardment of Cu-Bi cluster formation of core-shell structure with mainly Cu core and Bi shell was induced; withal Cu-Au nanoparticle tended to form nearly homogenous mixture with increased Au concentration in the near-surface layers. Ar1bombardment induced less intense atomic displacements and leaded to eccentric enriched copper core in the Cu-Bi cluster and inhomogeneous mixture in the Cu-Au cluster with even greater internal concentration of gold.
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