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Updated: May 23, 2026

Sample Preparation by 3D-Correlative Focused Ion Beam Milling for High-Resolution Cryo-Electron Tomography
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Published on: October 25, 2021

A convenient method for electron tomography sample preparation using a focused ion beam.

Xiongyao Wang1, Ross Lockwood, Doug Vick

  • 1National Institute for Nanotechnology, Edmonton, 11421 Saskatchewan Drive, Canada.

Microscopy Research and Technique
|March 31, 2012
PubMed
Summary

A novel sample preparation technique enhances three-dimensional electron tomography by reducing projected thickness issues. This method enables imaging up to a ±75° tilt range, minimizing contamination for clearer analyses.

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Area of Science:

  • Materials Science
  • Microscopy Techniques
  • Nanotechnology

Background:

  • Standard sample preparation for electron tomography faces challenges with projected sample thickness at high tilt angles.
  • Focused Ion Beam (FIB) preparation can introduce gallium (Ga⁺) contamination, particularly for rod-shaped samples.

Purpose of the Study:

  • To introduce a new sample preparation method for three-dimensional electron tomography.
  • To overcome limitations of existing methods regarding sample thickness and contamination.
  • To enable broader applicability of tomography for various sample types.

Main Methods:

  • Utilizes standard film deposition techniques.
  • Incorporates focused ion beam (FIB) milling.
  • Specifically designed to mitigate issues arising from projected sample thickness at high tilt angles.

Main Results:

  • Successfully reduced problems associated with projected sample thickness at high tilt angles.
  • Enabled tomography sample imaging across a ±75° tilt range.
  • Minimized Ga⁺ contamination compared to conventional FIB preparation of rod-shaped samples.
  • Provided extended thin regions suitable for standard 2D projection analyses.

Conclusions:

  • The developed method significantly improves sample preparation for three-dimensional electron tomography.
  • The technique offers a wider tilt range and reduced contamination, enhancing data quality.
  • This approach broadens the utility of electron tomography in practical applications.