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Related Concept Videos

Preparation of Samples for Electron Microscopy01:20

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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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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Related Experiment Video

Updated: Nov 17, 2025

Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
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Transmission electron microscopy sample preparation method for micrometer-sized powder particles using focused ion

Tong Liu1, Hongyan Jin2, Leilei Xu1

  • 1Vacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences (CAS), Suzhou, 215123, China.

Micron (Oxford, England : 1993)
|February 15, 2021
PubMed
Summary
This summary is machine-generated.

A new focused ion beam (FIB) method simplifies Transmission Electron Microscopy (TEM) sample preparation for micrometer powder particles. This technique enables efficient elemental distribution analysis across particle cross-sections.

Keywords:
EDX elemental mappingFIBLayersMicrometer-sized powder particlesPt coating layersTEM sample preparation

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Characterizing micrometer-sized powder particles is crucial for material analysis.
  • Traditional Transmission Electron Microscopy (TEM) sample preparation methods can be time-consuming and complex, especially for particles in the 1-10 μm range.
  • Existing methods often require embedding agents, limiting particle selection and analysis flexibility.

Purpose of the Study:

  • To develop a simplified and efficient sample preparation technique for micrometer-sized powder particles for TEM analysis.
  • To enable detailed elemental distribution characterization across the entire cross-section of individual particles.
  • To offer a universal method applicable to particles of varying sizes, shapes, and orientations.

Main Methods:

  • Utilized a focused ion beam (FIB) system for precise sample preparation.
  • Employed platinum (Pt) coating via ion-beam-assisted deposition for lamella support.
  • Integrated a micromanipulator with a tungsten needle for particle support and precise thinning.
  • Combined Scanning Electron Microscopy (SEM) for particle selection and TEM for observation and Energy-Dispersive X-ray (EDX) elemental mapping.

Main Results:

  • Successfully prepared TEM samples from micrometer-sized powder particles without embedding agents.
  • Achieved characterization of elemental distributions across complete particle cross-sections.
  • Demonstrated the ability to select and prepare particles of diverse characteristics (size, shape, orientation) based on SEM observations.
  • Reduced sample preparation time to a few hours, significantly increasing efficiency.

Conclusions:

  • The proposed FIB-based technique offers a simple, universal, and efficient method for TEM sample preparation of micrometer powder particles.
  • This approach facilitates detailed microstructural and elemental analysis, crucial for material science applications.
  • The reduced preparation time and enhanced flexibility make this technique highly valuable for researchers.