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这是一种实用的方法,用于对亚微米大小的粒子进行全倾角电子断层扫描

Jun Yamasaki¹, Tomohito Ishii², Kaito Teruya²

¹Research Center for Ultra-High Voltage Electron Microscopy, The University of Osaka, 7-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan; Instutute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.

Micron (Oxford, England : 1993)

|July 9, 2025

概括

一种新方法使纳米尺寸颗粒的全倾角电子断层扫描成为可能. 这项技术使用专门的支架和协议,实现快速,高质量的3D重建,而不缺少形效果.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
显微镜的使用方法

背景情况:

传输电子显微镜 (TEM) 对于纳米尺度成像至关重要.
全倾角断层扫描对亚微米颗粒具有挑战性,原因是样本持有器的限制和潜在的样本损伤.
现有的方法经常受到缺失的形效应的影响,限制了3D重建的准确性.

研究的目的:

开发一种实用的方法,用于纳米尺寸颗粒的全倾角电子断层扫描.
克服现有断层扫描技术的局限性,包括样品损伤和缺失形效应.
能够快速准确地3D重建亚微米粒子形态.

主要方法:

设计了一个专门的样本持有器,用于200kV的TEM,与±90°倾斜范围兼容.
开发了一种使用聚焦离子束 (FIB) 和扫描电子显微镜 (SEM) 的协议,通过碳沉积将颗粒连接到针上,最大限度地减少Ga离子束的损伤.
集成的针与样本持有器在TEM内无倾斜.
获得了聚乙烯乳和ZnO四足动物颗粒的倾斜系列图像.

主要成果:

在没有缺失形效应的情况下,实现了微微子粒子形状的清晰3D重建.
使用25秒的电影,证明了ZnO颗粒的快速断层扫描,产生与传统方法相比的结果,需要一个多小时.
通过对TiSe2片的原子分辨率成像来验证附着颗粒的机械稳定性.

结论:

开发的方法为纳米尺寸颗粒的全倾角电子断层扫描提供了实用和高效的方法.
这种技术显著减少了采集时间,并提高了3D重建的准确性.
该协议尽量减少样本损伤,确保高质量的TEM观测和可靠的结构分析.

关键词:

原子核问题解决方案电子断层扫描是一种电子断层扫描.快速断层扫描 (Fast tomography) 是一种快速的扫描技术.完全倾斜角断层扫描仪亚微米颗粒的粒子.

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