Synthesis,structure, and room-temperature ferromagnetism of Ni-doped ZnO nanoparticles |
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Authors: | G J Huang J B Wang X L Zhong G C Zhou H L Yan |
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Affiliation: | (1) Key Laboratory for Low Dimensional Materials & Application Technology of Ministry of Education, Institute of Modern Physics, Xiangtan University, 411105 Xiangtan, Hunan, China |
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Abstract: | In this paper, Ni-doped ZnO (Zn1−x
Ni
x
O, in which 0 ≤ x ≤ 0.05) diluted magnetic semiconductors nanoparticles are prepared by an ultrasonic assisted sol–gel process. Transmission
electron microscopy shows sphere-like nanoparticles with an average size of about 25 nm. From the analysis of X-ray diffraction,
the Ni-doped ZnO nanoparticles are identified to be a wurtzite structure, but impurity phases are observed when the Ni content
x reaches 0.05. Sample structures are further studied by Raman spectra, from which a broad and strong Raman band in the range
of 500–600 cm−1 is observed in Zn1−x
Ni
x
O. With the increment of x, wurtzite structures degrade gradually. The magnetic properties are measured using superconducting quantum interference device
at room temperature; the Zn1−x
Ni
x
O (x ≤ 0.02) nanoparticles show ferromagnetism. However, for the sample of Zn0.95Ni0.05O, paramagnetism is observed, which may be ascribed to ferromagnetic–antiferromagnetic competition. |
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Keywords: | |
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