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Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography

机译:原子分辨率电子断层成像分析超流氦纳米液滴中双金属簇的形成

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摘要

Structure, shape and composition are the basic parameters responsible for properties of nanoscale materials, distinguishing them from their bulk counterparts. To reveal these in three dimensions at the nanoscale, electron tomography is a powerful tool. Advancing electron tomography to atomic resolution in an aberration-corrected transmission electron microscope remains challenging and has been demonstrated only a few times using strong constraints or extensive filtering. Here we demonstrate atomic resolution electron tomography on silver/gold core/shell nanoclusters grown in superfluid helium nanodroplets. We reveal morphology and composition of a cluster identifying gold- and silver-rich regions in three dimensions and we estimate atomic positions without using any prior information and with minimal filtering. The ability to get full three-dimensional information down to the atomic scale allows understanding the growth and deposition process of the nanoclusters and demonstrates an approach that may be generally applicable to all types of nanoscale materials.
机译:结构,形状和组成是决定纳米级材料性能的基本参数,将其与其他同类材料区分开。为了在纳米尺度上从三个维度揭示这些,电子断层扫描是一种强大的工具。在像差校正的透射电子显微镜中将电子断层扫描技术提高到原子分辨率仍然具有挑战性,并且仅在使用强约束或广泛过滤的情况下进行了几次演示。在这里,我们展示了在超流氦纳米液滴中生长的银/金核/壳纳米团簇上的原子分辨率电子断层扫描。我们揭示了在三个维度上识别富金和富银区域的簇的形态和组成,并且我们在不使用任何先验信息和最少过滤的情况下估算了原子位置。获得完整的三维信息直至原子级的能力允许了解纳米团簇的生长和沉积过程,并证明了通常可适用于所有类型的纳米级材料的方法。

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