PVP-Assisted Synthesis of Cobalt Ferrite (CoFe2O4) Nanorods

Cobalt ferrite (CoFe2O4) nanorods were synthesized by iron chloride (FeCl3.6H2O) and cobalt sulfate hexahydrate (CoSO4.7H2O) as precursor in the presence of ethylene glycol agent and poly vinyl pyrrolidone (PVP) surfactant. The samples were characterized to identify the physical properties. XRD pattern of cobalt ferrite samples showed the structure of body center cubic (bcc) structure. The diameter of as-prepared samples was determined about 20 nm and annealed one was about 30 and 50 nm in diameter at 500 °C and 1100 °C, respectively. The TEM studies showed that the particles change from rod shaped to sphere-liked shaped particles by increasing annealing temperature. Peaks in the FTIRspectrum determined the element of Fe-Co nanoparticles. EDS shows peaks of iron and cobalt with fewer impurities in prepared samples and Fe/Co ratio was also decreased with increasing annealing temperature. The result of magnetic measurements showed saturation magnetization around 59.5 emu g-1 for annealed samples.