Tunable optical,electronic and magnetic properties of semiconductor nanoparticles induced by magnetic and nonmagnetic dopants: A comparative experimental and theoretical study |
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Authors: | Zahra Pezeshki-Nejad Sima Alikhanzadeh-Arani Amir Ehsan Rezaee Mohammad Almasi Kashi |
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Affiliation: | 1. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan 87317-51167, Iran;2. Department of Physics, University of Kashan, Kashan 87317-51167, Iran |
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Abstract: | While combining semiconductor and magnetic properties at the nanoscale provides dilute magnetic semiconductor (DMS) nanomaterials with a wide range of applications in next-generation electronic devices, tuning DMS properties still presents a challenge. Here, the synthesis of pure ZnO and transition metal (TM)-doped ZnO nanoparticles (NPs) with different magnetic (Fe and Co) and nonmagnetic (Mn) dopant concentrations (ranging from 2% to 10%) is reported using a co-precipitation method. Introducing the TM-dopants into ZnO NPs with 35?nm wurtzite structure causes crystallite and mean NP sizes to decrease, as characterized by X-ray diffraction and field-emission scanning electron microscopic analyses. Room-temperature magnetic measurements indicate coexistence of paramagnetic and ferromagnetic phases with tunability in the resulting TM-doped NPs. The maximum ferromagnetic coercivity and saturation magnetization are found to be 89?Oe and 0.074?emu/g for 10% Fe-doped ZnO NPs. UV–visible spectra showed a blue shift with increasing the dopant concentration, being in agreement with increasing trend in band gap energy calculated from band structure and density of state of TM-doped ZnO nanocrystal systems. |
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Keywords: | DMS Dilute magnetic semiconductor DMOs dilute magnetic oxides TM transition metal band gap energy Fermi level NPs nanoparticles NCs nanocrystals average crystallite size FESEM field-emission scanning electron microscope mean NP size DOS density of state BM Burstein–Moss Dilute magnetic semiconductor ZnO nanoparticle Transition metal-doped ZnO Room-temperature ferromagnetism Electronic properties Magnetic properties |
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