Technologies and methods for producing nanotubes

Main conception of fullerenes that represents a molecular formula of carbon and about single-layer and multilayer carbon nanotubes. Structure of nanotubes are presented in this article. Main methods of multilayer nanotube production are brought into account. Carbon nanotubes are usually produced in a process of condensation of carbon-metallic vapor by catalytic pyrolysis of hydrocarbon formula from CO, CH 4, C 2H 2, C 2H 4. In a simplest case it can be performed as graphite plate with monoatomic thickness, convoluted in cylinder, where carbon atoms are situated in hexagon apexes. Carbon nanotubes differ by diameter and hexagon locations in question of length. Conic and semi-spherical caps form at nanotubes ends.