Effect of Ni substitution on structural, morphological and magnetic properties of Zn₁₋ₓNiₓO nanorods

Ahmed, Faheem; Arshi, Nishat; Anwar, M.S.; Lee, Sung Hun; Byon, Eung Sun; Lyu, Nam Jin; Koo, Bon Heun

Effect of Ni substitution on structural, morphological and magnetic properties of Zn₁₋ₓNiₓO nanorods

2012

We report the preparation of Zn₁₋ₓNiₓO nanorods through a chemical route using microwave irradiation. The obtained Zn₁₋ₓNiₓO nanorods were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Raman spectroscopy and magnetization measurements. XRD and TEM results showed that the Zn₁₋ₓNiₓO nanorods have single phase nature with wurtzite structure and Ni was successfully incorporated at Zn site into the ZnO. The shape of the nanorods changed from hexagon (length ∼1.5 μm, diameter ∼200 nm) to pencil like tip (length ∼1 μm, diameter ∼80 nm) by only changing the Ni content from 1% to 3% in ZnO. Concerning the Raman scattering spectra, the modification in the intensity of E₂ ʰⁱᵍʰ mode and sub-band edge emissions provides enough evidence for the existence of intrinsic defects associated with the O atoms. Magnetic measurement results revealed that Zn₁₋ₓNiₓO nanorods show the well-defined ferromagnetic features at room temperature and the value of Mₛ increased with the increase of Ni concentration.

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