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用偏差校正电子显微镜对单个质量选择的Au星团的结构波动进行相对相对的观测

Malcolm Dearg^1,2, Cesare Roncaglia³, Diana Nelli³

¹Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF24 4HF, UK. slatert2@cardiff.ac.uk.

Nanoscale horizons

|October 25, 2023

概括

研究人员开发了一种新的方法,使用偏差校正扫描传输电子显微镜 (ac-STEM) 来逐一观察纳米粒子结构. 这种技术允许对单个纳米集群异构体进行详细分析,这对于完善理论模型至关重要.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
物理化学物理化学

背景情况:

潜在能量表面 (PES) 控制了纳米粒子的结构和动态,这对于理论模拟至关重要.
对纳米系统的PES参数的定量实验数据很少.
散装材料的参数可能不能准确地代表纳米尺度的行为.

研究的目的:

引入一种新的实验方法来表征单个纳米集群结构.
为验证和改进纳米粒子行为理论模型提供实验数据.
为了使纳米粒子的动态测量.

主要方法:

使用偏差校正扫描传输电子显微镜 (ac-STEM) 在高角度环状暗场 (HAADF) 模式.
分析单个黄金纳米集群 (309±15个原子) 沉积在无形碳膜上.
获得单个纳米集群的框架对框架结构信息.

主要成果:

确定了主要的异构体,包括二面体 (Ih),十面体 (Dh) 和面中心立方体 (fcc).
观察到许多无形 (玻璃状) 结构与结晶异构体一起.
结果与整体测量结果一致,验证了单粒子方法.

结论:

开发的ac-STEM方法使单个纳米集群结构的框架分析成为可能.
这种技术有助于对关键的 PES 参数进行定量实验测量.
为各种纳米粒子的动态研究铺平了道路.

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