The nanocarbonaceous material with helical structure is considered to be promising as nanocoils. Both left and right handed helical structures normally coexist and are disordered. So far, there has been no report about double or multi directional helical structures on an individual nanomaterial. In this paper, Multi directional helical structures were observed in an individual carbon nanofiber during the pyrolysis of acetylene at a mixture of C2H2∶ H2=2∶ 1. It is possible to control and prepare multi directional helical nanomaterial, and it can be used into new application area.
Carbon nanotubes were modified by FeSO 4 - H 2 O 2 system,iron hydroxides were adsorbed on the wall of carbon nanotubes simulta neously.These precursors were treated at723K for2h under hydrogen,nitrogen and a ir atmo - sphere to prepare carbon nanotubes supported γ- Fe 2 O 3 catalyst,γ- Fe 2 O 3 and α- Fe 2 O 3 compound catalyst and amorphous Fe 2 O 3 catalyst,respectively.This is green method to prepare high Fe 2 O 3 loading( ≥ 50%)abstract:catalyst without adding other cation.The different structures Fe 2 O 3 catalysts can be synthesized by controlling the condi - tion of thermal treatment to content active phase requirements for different catalytic reactions.The paper presents a new method to prepare carbon nanotubes supported catalysts.
