Majid Farahmandjou, Somayeh Shadrokh, Ali Moghimi

Recently, magntic nanomaterials have been used in wide range of applications such as medicine and electronic. In this research, rod-like shaped cobalt oxide magnetic nanoparticles (Co3O4) were synthesized by simple co-precipitation method using cobalt chloride as precursor and sodium borohydride (NaBH4) as reducing agent. Their structural and surface morphological properties were characterized by high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and vibration sampling magnetometer with (VSM). XRD measurement exhibited the structure of Co3O4 nanocrystals for annealed samples. The TEM results showed the cobalt oxide nanoparticles with good uniformity in the range size of 10-40 nm. The SEM images revealed that the particles changed from spherical shape to rod-like shape with increasing temperature. Magnetic measurements showed coercive field of around 84.5G and saturation magnetization of annealed of around 9.83 emu/g.


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