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Ahmed, F.,Arshi, N.,Anwar, M.S.,Lee, S.H.,Byon, E.S.,Lyu, N.J.,Koo, B.H. Elsevier 2012 CURRENT APPLIED PHYSICS Vol.12 No.suppl2
We report the preparation of Zn<SUB>1-x</SUB>Ni<SUB>x</SUB>O nanorods through a chemical route using microwave irradiation. The obtained Zn<SUB>1-x</SUB>Ni<SUB>x</SUB>O 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 Zn<SUB>1-x</SUB>Ni<SUB>x</SUB>O 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 E<SUB>2</SUB><SUP>high</SUP> 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 Zn<SUB>1-x</SUB>Ni<SUB>x</SUB>O nanorods show the well-defined ferromagnetic features at room temperature and the value of M<SUB>s</SUB> increased with the increase of Ni concentration.
Mn-doped ZnO nanorod gas sensor for oxygen detection
Ahmed, F.,Arshi, N.,Anwar, M.S.,Danish, R.,Koo, B.H. Elsevier 2013 Current Applied Physics Vol.13 No.suppl2
In this work, we have used resistive sensor measurements regarding the oxygen gas sensitivity of un-doped and Mn-doped ZnO nanorods prepared by microwave-hydrothermal method. X-ray diffraction (XRD) results indicated that the Mn-doped ZnO nanorods have single phase nature with the wurtzite structure. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results suggested that Mn-doped ZnO nanorods possessed higher aspect ratio (27) than un-doped ZnO (24). The selected area electron diffraction (SAED) pattern inferred that the ZnO nanorods have single crystalline nature with preferentially growth along [001] direction. Raman scattering spectra of Mn-doped ZnO nanorods revealed the modification in E<SUB>2</SUB> (high) mode that is related to the vibration of oxygen atoms in wurtzite ZnO, suggested the successful doping of Mn into Zn site in ZnO. The gas sensing properties measured at room temperature revealed that the Mn-doped ZnO nanorods exhibited high sensitivity as compared to un-doped ZnO.