Synthesis and characterization of NiFe2O4 magnetic nanorods via a PEG-assisted route

NiFe2O4 nanorods have been successfully prepared through a polyethylene glycol (PEG)-assisted route. The use of PEG-400 is a key factor that influences the formation of the nanorods from the contrast experimental. The effect of reaction temperature and NaOH concentration was discussed. The scanning electron microscopy images show that the magnetite particles are homogenous and have the shape of rods. The coercivity of as-prepared nanorods with PEG-400 reached as high as 662 Oe at room temperature, superior to that of nanoparticles obtained without PEG-400 and through a reverse microemulsion route.