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Glossary terms about Coating

In electron microscopy sample coating refers to the addition of a thin (e.g. 10-20 nm) layer of metal (usually, gold, chromium, platinum or palladium) or carbon, or possibly other materials, onto the surface of the sample. This is usually done to enhance conductivity.

8 pages mention Coating

Applications and practical uses - what the SEM can do
view bulk material, coatings, sectioned material, foils, even grids prepared for transmission electron microscopy). 
Background information - What is scanning electron microscopy?
This is often achieved by coating with a very thin layer of metal or carbon. 
Electron column
Electron gun
Generating an image
This coating is applied for two main reasons: (1) Non-conductive specimens are often coated to reduce surface charging that can block the path of SE and cause distortion of signal level and image form; and (2) Low atomic number (Z) specimens (e. 
Role of sample height
Sample preparation
Specimen chamber