Restructuring in bimetallic core-shell nanoparticles: Real-time observation

Restructuring in bimetallic core-shell nanoparticles: Real-time observation
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双金属核壳纳米粒子的重构:实时观察

DOI:
10.1103/physrevb.105.125401
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Ogi Hirotsugu
Ogi Hirotsugu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Nakamura Nobutomo;Matsuura Koji;Ishii Akio;Ogi Hirotsugu

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利用声学技术对溅射法合成的核壳结构纳米颗粒的形成过程进行了真实的实时观测。该技术使我们能够在室温下评估纳米颗粒的结构变化,而无需接触纳米颗粒或基底。在实验中,先溅射金属A,再溅射金属B,倾向于形成B-壳/A-核纳米颗粒。而在Pd-Au合金体系中,纳米粒子在合成过程中发生了明显的结构重组,形成了A壳/B核纳米粒子。用分子动力学模拟方法分析了这种结构的形成过程,揭示了这种结构的形成是在短时间内进行的,Au的高扩散率起着重要的作用。
The formation process of core-shell bimetallic nanoparticles synthesized by sputtering onto a substrate is observed in real time using an originally developed acoustic technique. The technique enables us to evaluate the structural change of nanoparticles at room temperature without contacting the nanoparticles or substrate. In the experiments, the sputtering of metal A followed by metal B tended to form B-shell/A-core nanoparticles. However, in Pd-Au alloy system, notable restructuring occurred during synthesis, resulting in the formation of A-shell/B-core nanoparticles. The formation process is analyzed using the molecular dynamics simulation, revealing that this restructuring occurs on a short timescale, and high diffusivity of Au plays an important role.
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发表时间: 1974
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