期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 29, 期 15, 页码 12917-12926出版社
SPRINGER
DOI: 10.1007/s10854-018-9411-7
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资金
- National Natural Science Foundation [61601359]
- Key Science and Technology Program - Shaanxi Province Science and Technology Bureau [16JS038]
- Principal's Foundation [XAGDXJJ15003]
- Dean's Foundation from Xi'an Technological University [13GDYJY03]
Co-doped ZnO-nanoparticles were synthesized using the sol-gel method. The microstructure, morphology, and physical properties of the particles were studied using several analytical methods, including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-vis absorption spectroscopy, photoluminescence spectrometry, and vibrating sample magnetometry. The structure of the Co-doped ZnO nanoparticles was identified as hexagonal wurtzite, which suggests that Co2+ can replace the Zn2+ sites in the ZnO crystal lattice without forming a secondary phase. For Co-doped samples, the optical energy bandgap decreased with an increase in the Co content. The absorption-band edges were 565, 610, and 653 nm, which correspond to the d-d transition of Co2+ ions in the tetrahedral field of ZnO. The PL spectra revealed a strong defect-emission, which indicates that defects may stabilize the ferromagnetic order. Room-temperature ferromagnetism was observed in Co-doped ZnO nanoparticles according to M-H measurements. Furthermore, the magnetization increased with increasing Co concentration. These findings suggest that Co-doped ZnO nanoparticles could promote the development of semiconductor devices with ferromagnetic properties above room temperature in magneto-optical and spintronic applications.
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