Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 6, Pages 6912-6924Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.12.188
Keywords
Dilute magnetic semiconductor; ZnO nanoparticle; Transition metal-doped ZnO; Room-temperature ferromagnetism; Electronic properties; Magnetic properties
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Funding
- council of Iran National Science Foundation
- University of Kashan [159271/740]
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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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