Doping effects of Co2+ ions on structural and magnetic properties of ZnO nanoparticles
In this paper, we report the synthesis of Zn1?xCoxO (0.0?x?0.10) nanoparticles by an auto-combustion method using glycine as a fuel. The prepared nanoparticles were characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and DC magnetization measurements. XRD results showed that Co doped ZnO have a single phase nature with wurtzite structure and Co2+ ions were successfully incorporated into the lattice position of Zn2+ ions in ZnO matrix. FTIR spectra demonstrated that the values of absorption bands were blue shifted with the increase of Co content. From the Raman spectra, all the peaks observed in undoped and Co-doped samples can be assigned to the Raman active modes of ZnO crystal. However, in case of Co doped ZnO sample, additional modes were observed that can be related to the substitution of Co into the Zn site. Magnetic studies showed that Co doped ZnO nanoparticles exhibit room temperature ferromagnetism.
zno x-ray diffraction dc magnetization ferromagnetism diluted magnetic semiconductor