Sputter coating is a process where a thin layer of metal is deposited onto a surface.
The grain size of these coating materials can vary depending on the metal used.
For metals like gold and silver, the grain size typically ranges between 5-10 nanometers (nm).
Gold is a common choice for sputter coating due to its excellent electrical conductivity.
However, gold has a larger grain size compared to other metals commonly used in sputtering.
This larger grain size makes gold less suitable for applications requiring high-resolution coatings.
In contrast, metals such as gold-palladium and platinum have smaller grain sizes.
These smaller grain sizes are beneficial for achieving higher resolution coatings.
Metals like chromium and iridium offer even smaller grain sizes, ideal for very fine coatings.
These metals require the use of a high vacuum sputtering system, specifically a turbomolecular pumped system.
The choice of metal for sputter coating in Scanning Electron Microscopy (SEM) applications is critical.
It directly affects the resolution and quality of the images obtained.
The coating process involves depositing an ultra-thin layer of metal onto a non-conducting or poorly conducting specimen.
This prevents charging and enhances the emission of secondary electrons.
As a result, it improves the signal to noise ratio and clarity of the SEM images.
The grain size of the coating material significantly impacts these properties.
Smaller grains generally lead to better performance in high-resolution imaging.
In summary, the grain size of sputter coatings for SEM applications typically ranges from 5-10nm for gold and silver.
There are options for smaller grain sizes available through metals like gold-palladium, platinum, chromium, and iridium.
The choice depends on the specific requirements of the imaging resolution and the capabilities of the sputtering system.
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