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Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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相关实验视频

Updated: Jan 16, 2026

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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在现场微尺度冷,使用聚焦离子束扫描电子显微镜进行冷.

Ambra Celotto1, Randi Holmestad2, Filippo Berto3

  • 1Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway.

Micron (Oxford, England : 1993)
|October 1, 2025
PubMed
概括

微尺度冷成功地连接了不相似的金属,如和铜,而没有表面准备. 这种方法使用塑料变形和剪切力,为电子产品的热辅助连接提供了一个有希望的替代方案.

关键词:
寒冷接是一种冷.电子显微镜的电子显微镜在FIB-SEM中.微型接 微型接 微型接微型制造业的微型制造

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科学领域:

  • 材料科学 材料科学 材料科学
  • 制造业 工程 制造工程
  • 表面科学是一门学科.

背景情况:

  • 微尺度冷工艺为电子元件提供高效的低温连接,保持材料性能.
  • 对不同金属结合机制的有限理解阻碍了工业采用,特别是在微观尺度上.
  • 由于这些局限性,热辅助方法仍然普遍用于微尺度连接.

研究的目的:

  • 开发和演示用于微尺度冷不同金属的试验床程序.
  • 调查结合机制,并确定影响关节质量的因素.
  • 评估这种技术在实际应用中的可行性.

主要方法:

  • 使用聚焦离子束 (FIB) 扫描电子显微镜进行精确的控制和表征.
  • 采用了一种新的方法,将一个圆的铜线推入合金孔中.
  • 进行了横截面分析,元素映射和传输电子显微镜 (TEM).

主要成果:

  • 在没有先前表面准备的情况下,成功地实现了和铜的结合.
  • 通过剪切力观察到显著的谷物精炼和机械去除污染物.
  • 确定FIB残留物作为粘合缺陷的来源;在它们的缺失下形成的统一接口.
  • 通过TEM确认了相互扩散和形成一层薄的Al-Cu金属间层.

结论:

  • 微尺度冷适用于不同金属的连接,通过塑料变形和剪切产生高质量的键.
  • 表面污染物和FIB残留物是影响键完整性的关键因素.
  • 开发的技术显示出在微电子领域及其他领域的工业应用潜力.