Abstract
A Mn-ZnO nanowire microsphere was prepared by using the hydrothermal method. The effects of Mn doping concentration and hydrothermal growth conditions on the crystal structures, morphologies, magnetic and optical properties of ZnO nanowire microsphere were studied. The characterization results showed Mn-ZnO nanowire microsphere with uniform and dense distributions along the [0001] direction with a hexagonal wurtzite structure. No impurity phases were detected in microsphere specimens. The room-temperature ferromagnetism of the Mn-ZnO nanowire microsphere was detected, with the saturation magnetization of 2.4 × 10−1 emu/g and a coercive field of 369 Oe. Furthermore, with the increase of Mn2+ ions doping concentration, the luminescence intensity of the sample decreases in both UV and visible regions, and slight blueshift in the visible light regions was observed. The theoretical results presented obvious spin polarization near the Fermi level, with strong Mn 3d and O 2p hybridization effects. The magnetic moments were mainly generated by Mn 3d and partial contribution of O 2p orbital electrons. Therefore, the Mn-ZnO nanowire microsphere can be used as a potential magneto-optical material.
Highlights
Metal oxide semiconductor materials are studied in depth in application aspects of energy storage, photoelectrochemistry and sensors [1,2], due to their good optical, electrical and chemical stability
Diluted magnetic semiconductors (DMSs) are a kind of magnetic semiconductor in which some atoms of the non-magnetic semiconductor crystal lattice are replaced with transition metal (TM) atoms
The room-temperature ferromagnetism of transition metal-doped ZnO became popular in early research work [4]
Summary
Metal oxide semiconductor materials are studied in depth in application aspects of energy storage, photoelectrochemistry and sensors [1,2], due to their good optical, electrical and chemical stability. Many TM ion (Co2+ , Mn2+ , cmmmCr2+ , Nd2+ )-doped ZnO materials have been extensively studied [5,6,7,8,9,10,11,12], but the research on Mn-doped ZnO nanowires microsphere is very limited. Has successfully prepared a V-doped ZnO nano barod material, and measurements showed ferromagnetism at room temperature, and the photoluminescence (PL) spectra show excellent UV and green light emission properties; Chu et al [17] has successfully synthesized single-crystal Cr-doped ZnO magnetic nanowire materials; Zhu et al [18] investigated the application of Fe-doped ZnO nanoarray materials. Li et al [26] synthesized Mn-doped ZnO thin films with various thickness and different doping concentration by a low cost sol-gel method and investigated its structural and optical properties.
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