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Double-layer coating for field-emission cryo-scanning electron microscopy--present state and applications
1Laboratories for Electron Microscopy I, Swiss Federal Institute of Technology, Zurich, Switzerland.
Scanning
|August 1, 1997
Summary
A novel double-layer coating method enhances electron microscopy of fast-frozen organic samples. This technique reduces artifacts and simplifies processing for brittle, high-pressure frozen specimens.
Area of Science:
- Materials Science
- Microscopy
- Biophysics
Background:
- Direct imaging of fast-frozen samples is crucial for electron microscopy of organic materials, avoiding chemical fixation and drying artifacts.
- Transmission electron microscopy (TEM) and cryo-scanning electron microscopy (cryo-SEM) are established techniques for imaging frozen samples.
Purpose of the Study:
- To introduce and evaluate a double-layer coating method combining advantages of TEM-replica and cryo-SEM techniques.
- To improve the imaging of brittle, rapidly frozen samples in electron microscopy.
Main Methods:
- A double-layer coating technique involving platinum shadowing and carbon coating of frozen bulk samples.
- Cryo-transfer of coated samples to a scanning electron microscope (SEM) with a cold stage.
- Imaging using material-dependent backscattered electron signals to visualize platinum distribution.
Main Results:
- Significantly reduced charging artifacts and beam damage effects during imaging.
- Facilitated processing of brittle, rapidly frozen samples by eliminating the need for replica cleaning.
- Demonstrated suitability for high-pressure frozen samples.
Conclusions:
- The double-layer coating method offers a simplified and effective approach for electron microscopy of challenging frozen samples.
- This technique enhances image quality by minimizing artifacts and streamlines sample preparation, making it ideal for high-pressure frozen biological materials.