Preparation of Cr-doped ZnS nanosheets with room temperature ferromagnetism via a solvothermal route

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• 作者：Zhufeng Zhang ; Jin Li ; ^{xjlijin@163.com} ; Jikang Jian ; Rong Wu ; Yanfei Sun ; Shengfeng Wang ; Yinshuan Ren ; Jiajie Li
• 关键词：B1. Nanosheets ; B2. Cr-doped ZnS ; B2. Ferromagnetism ; A2. Solvothermal
• 刊名：Journal of Crystal Growth
• 出版年：2013
• 出版时间：1 June, 2013
• 年：2013
• 卷：372
• 期：Complete
• 页码：39-42
• 全文大小：726 K

文摘

ZnS semiconductor nanosheets doped with different amounts of chromium have been successfully produced via the solvothermal reaction of ZnO and S with CrCl₃¡¤6H₂O in mixed solvents of ethylenediamine and ethanolamine at 180 ^¡ãC. X-ray diffraction (XRD) measurements demonstrated that the Cr-doped ZnS nanocrystals had a wurtzite structure. Scanning electron microscopy (SEM) images revealed that the morphologies of ZnS doped with high amounts of chromium consisted of regular nanosheets. Zn_1?xCr_xS (x=0.0934 or 0.1170) nanosheets produced a regular morphology with thicknesses of 50-100 nm, widths of 300 nm and lengths of 1 ¦Ìm. This product, composed of Cr, Zn, and S, was observed by an energy dispersive spectrometer (EDS). A vibrating sample magnetometer (VSM) showed that the Cr-doped ZnS nanosheets exhibited ferromagnetism at room temperature, while the pure ZnS nanosheets exhibited diamagnetism. The saturation magnetization of the Cr-doped ZnS nanosheets increased with increasing Cr concentration over the range of x=0.0241-0.0934. The saturation magnetization of the Zn_1?xCr_xS (x=0.0934) nanosheets was 8.6492 (10^?3 emu/g). The experimental results confirmed that Cr-doped ZnS nanosheets exhibit ferromagnetism at room temperature, in good agreement with the ferromagnetic properties of Cr-doped ZnS that were predicted by first-principles computations.