Sputter coating is used for SEM to enhance the imaging capabilities of the microscope.
It improves the electrical conductivity of the sample.
This reduces beam damage and increases the quality of the image.
This is particularly important for non-conductive or poorly conductive samples.
Why do we use sputter coater for SEM? 5 Key Benefits
1. Improving Electrical Conductivity
The primary reason for using sputter coating in SEM is to increase the electrical conductivity of the sample.
Many samples, especially biological and non-metallic materials, are poor conductors of electricity.
In an SEM, the electron beam interacts with the sample.
If the sample is not conductive, it can accumulate charge, leading to image distortion or even damage to the sample.
Sputter coating with metals like gold or platinum provides a conductive layer that prevents charge buildup.
It allows the electron beam to interact effectively with the sample.
2. Reducing Beam Damage
The high-energy electron beam in SEM can cause damage to sensitive samples, especially organic materials.
A thin metal coating can act as a buffer, absorbing some of the energy from the electron beam.
This reduces the direct impact on the sample.
It helps in preserving the integrity of the sample and obtaining clearer images over multiple scans.
3. Enhancing Secondary Electron Emission
Secondary electrons are crucial for imaging in SEM as they provide the contrast in the image.
Sputter coating enhances the emission of secondary electrons by providing a conductive surface that facilitates the emission process.
This leads to a higher signal-to-noise ratio, which is essential for obtaining high-resolution images.
4. Improving Edge Resolution
Sputter coating also reduces the penetration of the electron beam into the sample.
This is particularly beneficial for improving the edge resolution in the images.
It is crucial for detailed analysis of sample surfaces and structures.
5. Protecting Beam Sensitive Specimens
For very sensitive samples, the metal coating not only improves conductivity but also provides a protective layer.
This shields the sample from the electron beam's direct impact, thereby preventing damage.
Continue exploring, consult our experts
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