The growth of multi-walled carbon nanotubes on natural clay minerals (kaolinite, nontronite and sepiolite)

The suitability of clay minerals - kaolinite, nontronite and sepiolite - is studied for synthesis of nanocomposites based on carbon nanotubes. Particles of iron were used as catalysts. Prior to synthesis, kaolinite and sepiolite were doped by the catalytically active metal, whereas in the case of nontronite the presence was used of this metal in the matrix of this mineral. Synthesis of CNTs was performed by hot filament chemical vapor deposition method. The produced nanocomposites were examined by transmission and scanning electron microscopies and energy dispersive X-ray spectroscopy. The experiment verified the potential of the three microcrystalline phyllosilicates for the growth of carbon nanotubes. Under the same technology conditions, the type of catalyst carrier affects the morphology and structure of the nanotube product markedly.

► Verification of the synthesis of nanocomposites based on carbon nanotubes and three microcrystalline phyllosilicates. ► Variability of phyllosilicates allows to prepare catalyst carriers with various contents of active metal. ► The type of catalyst carrier affects the morphology and structure of the final nanotube product markedly. ► Each of the prepared nanocomposites may be advantageous for a certain field of applications.