Superparamagnetic cobalt-ferrite-modified carbon nanotubes using a facile method

Cobalt ferrite (CoFe2O4)/carbon nanotube (CNT) magnetic nanocomposites were synthesized by a facile solvothermal method. X-ray powder diffractometry (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), High-resolution electron microscopy (HRTEM) analyses demonstrate that cubic CoFe2O4 nanoparticles were immobilized on the external surfaces of the CNTs. Vibrating sample magnetometer (VSM) measurements indicated that the nanocomposites at room temperature were superparamagnetic with a saturation magnetization of 29.6 emu g−1.