Study of Catalytic Properties of Sol–Gel-Derived CoO_x–SiO_2 Film Systems by the Example of the Growth of Carbon Nanomaterials

摘要

Film catalytic samples in the Si–Co–O system in the composition range from 15 to 90 mol % Co have been prepared using the sol–gel technology. Carbon nanomaterials have been fabricated by pyrolytic synthesis using these films as catalysts. Raman spectroscopy of materials has shown that multiwalled carbon nanotubes are formed by pyrolysis on catalytic films containing Co_3O_4. The dependence of the carbon material length on the synthesis time has been considered. It has been shown that the average growth rate of tubes and fibers is ~3 μm/min.