Abstract Submitted to the    NANOTUBE'04 Conference:

The MOCVD of Fe-C-system was used in the presence of additives, which can be 1) energy transfer active, 2) mass transfer active, 3) chemically active and 4) catalytic active. The most universal additive is ferrocene. The single Fe-crystals, coated with single-layered carbon film (in presence of 1,2-dibromoethane), the fractal shapes of X-ray amorphous Fe-C-system (in presence of allyl bromide) were obtained on MOCVD from Fe(CO)5 at 300-350^oC. Various aperiodical carbon shapes including single-wall and multi-wall nanotubes (NTs) were produced at 800^oC from benzene in the presence of ferrocene. The single-wall NT growth is discussed on the basis of molecular dynamics calculations. Catalysis and self-organization of multi-wall nanotube growth is proposed on the basis of theoretically predicted the exo-endo-isomerization of iron atom bonded on carbon structure. This isomerization may be a basis for growing the multi-wall nanotubes at high temperatures on continuous deposition of carbon or carbonic fragments. The flow of carbonic material on chemical or physical vapor deposition and on collision with nanotube top carrying iron atom transfers high energy to the nanotube top. This energy amount will be sufficient for the exo-endo-Fe-isomerization. Thus the catalytic center is regenerated at the nanotube top. After this the self-organization of carbonic fragments and systems on Fe-atom and the nanotube surface shape produces next carbonic layer. This work was supported by the ISTC project No.2511 and President grant of RF 1652.2003.3.