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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Overview of Electron Microscopy01:25

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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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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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Overview of Microscopy Techniques01:22

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Updated: Jun 27, 2025

Author Spotlight: Advanced Techniques for Characterizing Tissue Mineralization in Bone Regeneration Research
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Standardization and quantification of backscattered electron imaging in scanning electron microscopy.

Shih-Ming Wang1, Yu-Cheng Chiu1, Yu-Hsin Wu1

  • 1Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan; Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.

Ultramicroscopy
|May 1, 2024
PubMed
Summary

A new bolometer platform, Atomic Number Electron Microscopy (ZEM), directly measures absorbed energy for precise atomic number (Z) analysis. This technique standardizes backscattered electron (BSE) imaging, improving quantitative analysis and light element detection.

Keywords:
Backscattered electronElectron microscopyStandardizationThermal absorbance

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Area of Science:

  • Materials Science
  • Physics
  • Analytical Chemistry

Background:

  • Backscattered electron (BSE) imaging in scanning electron microscopy (SEM) is crucial for scientific and industrial applications.
  • Current BSE imaging faces challenges in standardization and precise quantification.
  • Existing calibration and simulation methods have practical limitations for broad use.

Purpose of the Study:

  • To introduce a novel bolometer platform for direct measurement of absorbed thermal energy.
  • To establish a new technique, Atomic Number Electron Microscopy (ZEM), for accurate atomic number (Z) analysis.
  • To enhance standardization and quantitative analysis in electron microscopy.

Main Methods:

  • Development of a bolometer platform to measure sample's absorbed thermal energy.
  • Utilizing the conservation of energy principle for standardization.
  • Integration of ZEM with traditional BSE detection.

Main Results:

  • The bolometer platform directly quantifies absorbed energy, enabling atomic number (Z) analysis.
  • ZEM functions as a highly effective BSE detector, simplifying quantitative analysis.
  • Combined ZEM and BSE signals improve detection of light elements and compounds.

Conclusions:

  • The ZEM technique offers a standardized and quantitative approach to electron microscopy.
  • This method overcomes limitations of previous BSE imaging techniques.
  • ZEM enhances microanalysis capabilities, particularly for light elements.