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在1纳米分辨率的3D化学成像与合多模态电子断层扫描

Jonathan Schwartz¹, Zichao Wendy Di², Yi Jiang³

¹Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, USA.

Nature communications

|April 26, 2024

概括

研究人员开发了一种用于3D化学成像的新方法,在显著减少电子束暴露的情况下实现亚纳米分辨率. 这一突破克服了分析纳米级材料的先前局限性,使其能够以高精度进行详细的化学绘图.

科学领域:

材料科学材料科学材料科学
计量学计量学计量学
电子显微镜电子显微镜

背景情况:

纳米级物质的3D化学成像是至关重要的,但由于罕见的不弹性散射事件和远光暴露而受到限制.
现有的方法在分辨率和样本损坏方面存在困难,特别是在复杂的材料中.

研究的目的:

为了实现纳米级的高分辨率3D化学成像.
为了克服化学分析的电子显微镜中剂量依赖损伤的局限性.

主要方法:

融合式多模式电子断层扫描,结合弹性 (HAADF) 和不弹性 (EDX/EELS) 信号.
开发了一种数据融合技术,将来自不同散射事件的信息连接起来.

主要成果:

在Au-Fe3O4,Co3O4-Mn3O4和ZnS-Cu0.64S0.36.36等各种材料中实现了亚纳米分辨率的3D化学成像.
通过多模式数据融合,减少了高达99%的电子剂量.
证明了对复杂纳米材料的亚纳米 3D 分辨率化学测量.

结论:

聚合多模电子断层扫描使得高分辨率的3D化学成像能够显著减少辐射剂量.
这种技术适用于广泛的几何和组成复杂的材料.
现在可以实现纳米级物质的亚纳米级3D化学映射.

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