Properties of Co/Ni codoped ZnO based nanocrystalline DMS

被引:92
作者
Aljawfi, Rezq Naji [1 ]
Mollah, S. [1 ]
机构
[1] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India
关键词
DMS; XRD; Optical property; Magnetic property; MAGNETIC-PROPERTIES; FERROMAGNETISM; SPECTROSCOPY; ABSORPTION; EXCHANGE;
D O I
10.1016/j.jmmm.2011.06.069
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nanoparticles of Co and Ni codoped zinc oxide, Zn0.9Co0.1-xNixO (x=0.0, 0.03, 0.06 and 0.09), diluted magnetic semiconductors (DMSs) are synthesized by the sol-gel method at annealing temperature of 500 degrees C. X-ray diffraction (XRD) patterns confirm the single phase character of the samples with x=0.0 and 0.03. However, minor NiO secondary phase is detected in the samples with x=0.06 and 0.09. All of them possess the hexagonal wurtzite structure. There is no significant change in the lattice parameters due to variation of doping concentration. The average particle size is found to be 19.31-25.71 nm. FTIR and UV-vis spectroscopic results confirm the incorporation of the dopants into the ZnO lattice structure. Magnetization data reveal the presence of room temperature ferromagnetism (RTFM). The XRD patterns rule out the formation of secondary phase of either metallic Co cluster or CoO in the samples. Nevertheless, the secondary phases are a concern in any DMS system as a source of spurious magnetic signals. Therefore, we carried out the XPS studies from which the oxidation states of Co and Ni are found to be Co2+ and Ni2+, respectively. Moreover, XPS O 1s spectra show evidence of the presence of the oxygen vacancy in the ZnO matrix. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:3126 / 3132
页数:7
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