Preparation and magnetic property of multi-walled carbon nanotube/a-Fe2O3 composites

In order to attain new functional nanomaterials with good magnetic property, multi-walled carbon nanotubes/hematite （MWNTs/α-Fe2O3） composites were synthesized using the co-deposition method. MWNTs/α-Fe2O3 composites were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy（TEM）, Raman spectroscopy and vibrating sample magnetometry （VSM）. The experimental results show that the structure and magnetic properties of the MWNTs/α-Fe2O3 composites are related to the heat treatment temperature. MWNTs are modified by α-Fe2O3 nano-particles and α-Fe2O3 nanorods with a diameter of 10-50 nm after being treated at 450 ℃. When the heat treatment temperature exceeds 600 ℃, MWNTs are only modified by Fe3O4 particles. Furthermore, the MWNTs composites treated at 450 ℃ and 600 ℃ have good magnetic behaviour.