Synthesis of Nano-Sized Cobalt oxide Nano-Particles Stabilized in Surfactant and Polymer Matrix and their Magnetic Properties

In this work, different-sized cobalt oxide nano- rods were selectively synthesized with narrow size distribution, by using chemical preparation methods, which could be carried out by the salt reduction technique. The samples were prepared at different temperatures, and two different types of stabilizer PVP and TOAB were added. Smaller sizes of the samples were obtained in the presence of stabilizer, and the type of stabilizer had no effect on the size. The size of the samples increased with increasing the temperature at which the synthesis of the nanoparticles was performed. The magnetic measurements showed that the nano-rods had a superparamagnetic and paramagnetic character, which depended on the size of the samples and on the existence of the stabilizer. The type of stabilizer had affected the magnetic property of the samples. The superparamagnetic component of the sample that was prepared with Polyvinyl-pyrrolidone (PVP) stabilizer was stronger than that prepared with Tetraoctylammonium bromide (TOAB) stabilizer.