Multi-walled carbon nanotube

A variety of techniques may be used for the synthesis of carbon nanotubes. These include electrolysis of molten salts with a graphite cathode, chemical vapour deposition, and striking graphite with an electric arc. This multi-walled tube was produced by the catalytic cracking of a hydrocarbon gas. The graphitic planes are clearly visible and a thin layer of amorphous carbon can be seen on the outer surface of the tube.