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电子束辅助Au纳米晶体剪切和旋转

Jiajian Guan1,2, Wuxin Yang2, Weidong Zhang3

  • 1School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand.

Nano letters
|January 24, 2025
PubMed
概括

电子束辐射诱导金纳米晶体的结构转变,通过创建热尖峰. 这一过程将格子从非密集的平面转移到密集的平面,从而实现精确的纳米晶体操纵.

关键词:
电子束辐射辐射的电子束辐射.在现场观测,现场观察.纳米晶体是一种纳米晶体.结构转型 结构转型热峰值效应的热峰值效应是什么

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 固态物理 固态物理

背景情况:

  • 了解光束诱导的结构过渡对于纳米材料相位工程至关重要.
  • 实地研究这些转变在实验上具有挑战性.

研究的目的:

  • 在电子束辐射下研究黄金纳米晶体中转移稳定的结构转变.
  • 阐明驱动格子变化和纳米晶体旋转的机制.

主要方法:

  • 使用偏差校正高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 进行辐射.
  • 采用电子能量损失光谱 (EELS) 和两温度模型来估计热峰值.

主要成果:

  • 观察到一个从非密封 (311,220) 到密封 (111) Au格子平面的过渡.
  • 将转变归因于谷物边界的剪切应变梯度,临界剪切应变为~0.2.2.
  • 由热尖峰驱动的非随机格子旋转.

结论:

  • 电子束辐射通过热尖峰诱导黄金纳米晶体的显著结构变化.
  • 谷物边界的剪切应变在相位过渡中起着至关重要的作用.
  • 使用光束辅助技术提供了精确纳米晶体操纵的见解.