Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography.
Formation of bimetallic clusters in superfluid helium nanodroplets analysed by atomic resolution electron tomography.
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DOI：
10.1038/ncomms9779
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发表时间：
2015-10-28
影响因子：
16.6
通讯作者：
Kothleitner G
中科院分区：
文献类型：
--
作者：
Haberfehlner G;Thaler P;Knez D;Volk A;Hofer F;Ernst WE;Kothleitner G
结构、形状和成分是决定纳米材料性能的基本参数，使其区别于大块材料。为了在纳米级的三维空间中揭示这些特征，电子断层扫描是一个强大的工具。在像差校正的透射电子显微镜中将电子断层扫描提高到原子分辨率仍然具有挑战性，并且仅使用强约束或广泛滤波进行了几次证明。在这里，我们展示了原子分辨率电子断层扫描银/金核/壳纳米团簇生长在超流氦纳米液滴。我们揭示了形态和组成的集群识别金和银丰富的区域在三维空间中，我们估计原子的位置，而不使用任何先验信息和最小的过滤。获得原子尺度的完整三维信息的能力允许理解纳米团簇的生长和沉积过程，并展示了一种可普遍适用于所有类型的纳米级材料的方法。 将电子层析成像技术提高到原子分辨率是一个强大而具有挑战性的过程。在这里，作者展示了在超流氦纳米滴中生长的银-金核-壳纳米团簇的原子分辨率电子断层扫描，揭示了它们的三维形态和组成。
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. Advancing electron tomography to atomic resolution is a powerful and challenging process. Here, the authors demonstrate atomic resolution electron tomography on silver-gold core-shell nanoclusters grown in superfluid helium nanodroplets, revealing their three-dimensional morphology and composition.