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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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Updated: Sep 23, 2025

Miniaturized Sample Preparation for Transmission Electron Microscopy
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A non-destructive and efficient transfer method for preparing 2D materials samples for transmission electron

Fengjiao Lyu1, Bin Tang1,2, Xuan Li1,2

  • 1Key Laboratory for the Physics and Chemistry of Nanodevices, School of Electronics, Peking University, Beijing 100871, People's Republic of China.

Nanotechnology
|May 13, 2022
PubMed
Summary
This summary is machine-generated.

A new, non-acidic transfer method efficiently prepares two-dimensional (2D) materials for transmission electron microscopy (TEM) imaging. This technique avoids sample damage and contamination, crucial for acid-sensitive 2D materials.

Keywords:
2D materialsIn2Se3TEM samples preparationtransfer method

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Transmission electron microscopy (TEM) is vital for characterizing two-dimensional (2D) materials.
  • Conventional wet transfer methods often use acids or alkalis, damaging acid/alkali-sensitive 2D materials.
  • Dry stamping techniques can compromise the integrity of TEM grid substrates.

Purpose of the Study:

  • To develop a non-destructive and efficient transfer method for preparing 2D materials for TEM analysis.
  • To overcome limitations of existing transfer techniques, particularly for sensitive 2D materials.
  • To provide a widely applicable method for diverse 2D materials and substrates.

Main Methods:

  • Utilized heat-release tape, polymethyl methacrylate (PMMA), and blue Nitto tape.
  • Employed a process free from acidic or alkaline chemicals.
  • Integrated the transfer within 30 minutes post-exfoliation.

Main Results:

  • Successfully transferred exfoliated 2D nanosheets onto TEM grids without damage or contamination.
  • Demonstrated applicability to 2D materials not resistant to acids or alkalis.
  • Validated the method's efficiency and broad applicability across various 2D materials and substrates.

Conclusions:

  • The presented method offers a non-destructive, efficient, and versatile approach for TEM sample preparation of 2D materials.
  • This technique significantly minimizes impurities and substrate damage.
  • It is particularly advantageous for sensitive 2D materials and expands the scope of TEM analysis.