Optical and magnetic properties of Fe-doped ZnO nanoparticles prepared by the sol-gel method
by Talaat M. Hammad; Stefan Griesing; Matthias Wotocek; Sylvia Kuhn; Rolf Hempelmann; Uwe Hartmann; Jamil K. Salem
International Journal of Nanoparticles (IJNP), Vol. 6, No. 4, 2013

Abstract: Fe-doped ZnO nanoparticles were prepared in a solvo-thermal via sol-gel process by base-catalysed hydrolysis of zinc acetate with doping concentrations from 2 up to 5% Fe. The structural, magnetic and optical properties of the samples were studied by using X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, superconducting quantum interferometer device (SQUID) and UV-VIS spectroscopy. A reduction in particle size was shown with increase in the dopant (Fe) concentration in ZnO. The Fe-doped ZnO samples possess ferromagnetism at room temperature with significant changes in M-H loop with increasing doping concentration. The hysteresis loops reveal that the saturation magnetisation Ms and the coercivity Hc for 2% Fe and 5% Fe-doped ZnO are 2.29 emu/g, 3.91 emu/g, 671 Oe and 659 Oe, respectively. The optical properties were determined by UV-vis spectroscopy and photoluminescent spectroscopy. In this study, the optical band gap of ZnO nanoparticles increased from 3.5 eV to 3.71 eV when the Fe concentration was increased up to 5%. In the present work, the optical and magnetic properties of Fe doped ZnO nanoparticles are improved by a sol gel method.

Online publication date: Mon, 31-Mar-2014

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