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Carbon Evaporation Rods and Fibers
108C Auto Carbon Coater
208C High Vacuum Turbo Carbon Coater

Evaporation with Carbon Rods versus Carbon Fibers

Carbon coating is widely used in electron microscopy and microprobe analysis for:

The most commonly used methods are carbon evaporating using a pre-shaped carbon rod or from a woven thread of carbon fiber in a vacuum system.

Features of carbon rod evaporation using a Bradley type pre-shaped rod fed source Features of carbon evaporation using flash evaporation of woven carbon fiber thread Considering the above features, it is clear that using pre-shaped rods with the correct controls system (pulse, continuous and auto-cycle modes) delivers not only the better quality carbon layer but also give much better control over the thickness of the carbon layer.

Note: The quality of the carbon coating depends on the vacuum system used when evaporating the carbon. In a turbo pumped high vacuum system (typical 10-5 mbar range or better) the carbon is deposited a virtually amorphous structure not resolvable by SEM or FESEM imaging. This type of coater needs to be used for FESEM, Microprobe, EBSD and TEM applications. For standard SEM/EDS applications a much simpler system can used, utilizing a rotary vane pumping system delivering a vacuum level of 10-3 mbar. At these vacuum levels the carbon layer has a structure, which can be revealed at magnifications of approx 25,000x.
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Carbon pointsbr /> Possible carbon pointed rod shapes and their setups. The top illustration, with neck rods, is usually preferred.  

PELCO easiShaper Carbon Rod Shaper - Sharpener

PELCO easiShaper™
Carbon rod shaper for stepped carbon rods.