Mn doped ZnO nanostructures have been prepared using low temperature simple, quick, and versatile synthesis approach. The
structural, microstructural, and vibrational investigations reveal that as prepared nanostructures with low Mn doping concentration
have single hexagonal phase and are grown along the preferred c-axis. The X-rays photoelectron spectroscopy demonstrates that the Mn ions are in mixed oxidation states for high doping concentration
of Mn, while are in 2+ oxidation state for low concentration into ZnO lattice. The photoluminescence spectrum (PL) exhibits
a significant red-shift of 22 nm in the optical band gap of doped ZnO and shows the improved luminescence properties, which
makes it potential for its use in the photocatalyst, optoelectronics and solar cell nanodevices. Furthermore, the magnetic
measurement of Mn doped ZnO nanostructures exhibits the ferromagnetism at room temperature.
KeywordsFerromagnetism–Mn doping–ZnO–Red shift–Narrowing of band-gap
"Due to its potential application in many areas such as optoelectronic devices, solar cells, chemical sensor, and photocatalyst hence, it has attracted the attention of more and more researchers and scientists to develop ZnO in the field of science and technology. In addition, ZnO is lower in cost and is environmental friendly as compared to other metal oxides . Normally, ZnO is studied in nanoscale; this is probably due to the fact that the high surface area to mass ratio of nanoparticles could enhance the adsorption of organic pollutants on the surface of particles as compared to the bulk materials . "
[Show abstract][Hide abstract] ABSTRACT: A simple coprecipitation technique was introduced to form manganese (Mn) doped on zinc oxide (ZnO) nanoparticles effectively. Based on our morphological studies, it was revealed that mean particle size was increased while bigger agglomeration of nanoparticles could be observed as the amount of concentration of Mn was increased. Interestingly, it was found that the position of the absorption spectra was shifted towards the lower wavelength (UV region) as correlated with the increasing of Mn dopants concentration into ZnO nanoparticles. This result inferred that optimum content of Mn doped into the ZnO nanoparticles was crucial in controlling the visible/UV-responsive of samples. In the present study, 3 mol% of Mn dopants into the ZnO nanoparticles exhibited the better UV as well as visible light-responsive as compared to the other samples. The main reason might be attributed to the modification of electronic structure of ZnO nanoparticles via lattice doping of Mn ions into the lattice, whereas excessive Mn dopants doped on ZnO nanoparticles caused the strong UV-responsive due to the more 3d orbitals in the valence band.
Journal of Nanomaterials 01/2014; 2014:1-6. DOI:10.1155/2014/371720 · 1.64 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: By ab-initio calculations on Zn0.95−x
O, we study the variations of magnetic moments versus Cu concentration. The electronic structure is calculated by using the Korringa–Kohn–Rostoker (KKR) method combined with coherent potential approximation (CPA). We show that the total magnetic moment and magnetic moment of Co increase with increasing Cu content. From a density of state (DOS) analysis, we propose an explanation of the enhancement of the Co magnetic moment versus Cu concentration.
Journal of Superconductivity and Novel Magnetism 10/2012; 25(7). DOI:10.1007/s10948-012-1681-3 · 0.91 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Zn(0.98)Mn(0.02)O nanocrystals were synthesized by the wet chemical route and were treated with different content of octylamine. The environment around Mn and the defect type and concentration were characterized by photoluminescence, Raman, X-ray photoelectron spectroscopy, and X-ray absorption fine structure. It is found that N codoping effectively enhances the solubility of Mn substituting Zn via reducing donor binding energy of impurity by the orbital hybridization between the N-acceptor and Mn-donor. On the other hand, the O atoms released from MnO(6) and the N ions from octylamine occupy the site of oxygen vacancies and result in reduction of the concentration of oxygen vacancies in Zn(0.98)Mn(0.02)O nanocrystals.
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