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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Probing atomic ordering and multiple twinning in metal nanocrystals through their vibrations
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Probing atomic ordering and multiple twinning in metal nanocrystals through their vibrations

机译：通过振动探测金属纳米晶体中的原子有序和多重孪生

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摘要

Control of nanocrystal (NC) crystallinity currently raises great interest because of its potential benefits in both physics modeling and technological applications. Advances in methods for synthesizing perfect single-crystalline NCs are recent, so that the effect of crystallinity on NC properties has received only limited study and still needs to be properly investigated. Here, we report that crystallinity of gold NCs dramatically modifies their vibrations. Using low-frequency Raman scattering, we clearly demonstrate that single-domain NCs vibrate differently than their multiply twinned counterparts, through the splitting of the quadrupolar vibrations, which is only observed for the former. Using the resonant ultrasound approach, we calculate the vibrational frequencies of a gold sphere and show that elastic anisotropy induces a lift of degeneracy of the quadrupolar mode in good agreement with our experimental measurements. These findings open up challenging perspectives on using Raman spectroscopy to characterize nanocrystallinity.
机译：当前，由于其在物理建模和技术应用中的潜在益处，控制纳米晶体（NC）结晶度引起了人们极大的兴趣。最近，合成完美单晶NC的方法取得了进展，因此结晶度对NC性能的影响仅受到了有限的研究，仍然需要进行适当的研究。在这里，我们报告说，金纳米晶的结晶度极大地改变了它们的振动。使用低频拉曼散射，我们清楚地表明，通过四极振动的分裂，单域NC的振动不同于它们的多对孪生振动，这仅在前者中可以观察到。使用共振超声方法，我们计算了金球的振动频率，并表明弹性各向异性引起了四极模简并性的提升，与我们的实验测量结果非常吻合。这些发现为使用拉曼光谱表征纳米结晶度开辟了具有挑战性的观点。

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