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Methods for specimen thickness determination in electron microscopy.

J Berriman, R K Bryan, R Freeman

    Ultramicroscopy
    |January 1, 1984
    PubMed
    Summary
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    A novel transmission electron microscopy technique uses gold particles and computer analysis to accurately measure specimen thickness. This method distinguishes particle layers, enabling precise distance calculations for various materials.

    Area of Science:

    • Materials Science
    • Microscopy Techniques
    • Nanotechnology

    Background:

    • Accurate specimen thickness is crucial for quantitative analysis in transmission electron microscopy (TEM).
    • Existing methods for thickness determination have limitations in precision and applicability.
    • Developing reliable methods for thickness measurement is essential for nanoscale research.

    Purpose of the Study:

    • To introduce and validate a new computer-assisted method for determining specimen thickness in TEM.
    • To enable precise measurement of distances between particle layers within specimens.
    • To assess the accuracy and applicability of the new method across different sample types.

    Main Methods:

    • Specimen preparation involves marking with gold nanoparticles.

    Related Experiment Videos

  • Image analysis of tilt series using specialized computer algorithms.
  • Distinguishing and analyzing particle populations on different planes.
  • Validation through comparison with established techniques like transverse sectioning and STEM mass measurement.

    • Main Results:

    • The method successfully distinguishes particle populations on different planes.
    • Accurate calculation of distances between planes with statistical variation is achieved.
    • Results show good agreement when compared to transverse sectioning, STEM mass measurement, optical density, and quartz crystal microbalance methods.
    • Effective application demonstrated for carbon films, multilayered protein crystals, and thin sectioned cells.

    Conclusions:

    • The gold particle-based computer-assisted method provides a reliable and accurate approach for specimen thickness determination in TEM.
    • This technique offers advantages in distinguishing layered structures and quantifying distances.
    • The method is versatile and applicable to a range of biological and material science specimens.