The preparation of Al2O3/M (Fe, Co, Ni) nanocomposites by mechanical alloying and the catalytic growth of carbon nanotubes

Mechanical alloying was employed to produce Al 2 O 3 /M (M=Fe, Co, Ni) nanocomposites.It was found that high-energy mechanical milling could realize not only drastic refinement but also the well dispersion of catalyst precursors in oxide matrixes.After mechanical milling, the solid-state alloying and the accelerated substitutional reactions were observed between the parent oxides.The as-obtained Al 2 O 3 /M nanocomposites possessed the fine-grained and porous structures and thus high reducibility.Large-scale formation of multiwalled and single-walled carbon nanotubes were achieved by using these mechanical alloying-derived Al 2 O 3 /M nanocomposites.