Preparation of Bundled Magnetic Nanowires with Ordered Mesoporous Materials

Ordered SBA-15 mesoporous materials was synthesized by the hydrothremal method; then CoFe2O4 and NiFe2O4 magnetic nanowires were prepared using SBA-15 as template through the nano-replication method. Low-angle X-ray diffraction, N-2 adsorption-desorption, field-emission scanning electron microscopy and transmission electron microscopy were used to characterize the structure and morphology of the as-prepared SBA-15, bundled CoFe2O4 and NiFe2O4 nanowires. The results demonstrate that SBA-15 possesses the two-dimensional hexagonal straight channel structure with the pore size of about 8 nm, which could be used as the template to synthesize one-dimensional nanomaterials. The diameter of bundled CoFe2O4 and NiFe2O4 nanowires is similar to that of SBA-15. The magnetic properties of as-synthesized nanowires were characterized with vibrating sample magnetometer. The result indicate that CoFe2O4 nanowires present ferromagnetism, while NiFe2O4 nanowires possess superparamagnetism.