Dielectric relaxations and optical properties of Mn-doped ZnO nanoparticles
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Dielectric relaxations and optical properties of Mndoped ZnO nanoparticles T. Abdel-Baset1,2, S. Saber1, and S. El-Sayed1,* 1 2
Department of Physics, Faculty of Science, Fayoum University, El Fayoum 63514, Egypt Department of Physics, Faculty of Science, Taibah University, Yanbu 46423, Saudi Arabia
Received: 27 July 2020
ABSTRACT
Accepted: 4 October 2020
Nanoparticles (NPs) of pure zinc oxide (ZnO) and Zn1-xMnxO, where x = 0.01 and 0.05, were prepared using the co-precipitation method. The X-ray diffraction patterns revealed that both pure ZnO and Mn-doped ZnO NPs crystallize in hexagonal wurtzite. Different structure parameters are given. Other characterizations, such as scanning electron microscopy, energy-dispersive X-ray spectroscopy, and FTIR, were used to test the studied samples. The dielectric and optical properties were performed and discussed in detail. It was found that the dielectric permittivity and the ac conductivity of pure ZnO NPs increased significantly when the Mn ions substituted the Zn ones. A small polaron hopping conduction mechanism is suggested for the investigated samples. Different optical parameters were calculated in this work. The outcome results are discussed and compared to similar materials.
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Springer Science+Business
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1 Introduction Zinc oxide (ZnO) is one of the most promising materials for different applications such as solar cells, light emitter, and optical sensors. [1, 2]. Therefore, ZnO has great attention owing to its direct bandgap (& 3.37 eV) and binding energy (60 meV). With these features, ZnO is still an active area of research. There are different and numerous publications on transition metal-doped ZnO [3–15] since it is an interesting subject of research. It was found that the physical properties of ZnO depend on the type of the transition metals which substituted Zn. For instance, the optical bandgap, Eg, dielectric constant, and magnetic properties of ZnO increased as the content
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https://doi.org/10.1007/s10854-020-04611-0
of Co in Zn1-xCoxO increased [3–5]. Both optical and magnetic properties of ZnO were improved by the doping of Fe ions [6], where the crystal structure did not change up to 5 wt% of Fe while a ferromagnetic transition around the room temperature (RT) was observed. Furthermore, a higher photocatalytic activity, as well as a decrease in Eg, was reported for Mg-doped ZnO [7]. Different groups have been focused on the physical properties of Mn-doped ZnO [8–15]. The outcome results can be summarized as; the physical properties of ZnO depend on the content of Mn ions, the crystal structure is hexagonal wurtzite [8, 9], the conduction mechanism is hopping [10], the dielectric constant and electrical conductivity were enhanced [11], a
J Mater Sci: Mater Electron
magnetic transition was observed at RT [8], the Eg is blueshifted compared with that of pure ZnO [12], the combination of Mn-doped ZnO with poly(3hexythiophene) is good for solar energy [1
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