Co-doped ZnS hybrid nanoparticles were synthesized by chemical precipitation method. XRD peaks were shifted toward higher angle with increasing dopant concentration, which were corresponding to the structural changes in the presence of Co. Chemical compositions of the prepared materials were confirmed by EDAX. High-resolution transmission electron micrographs (HRTEM) revealed finger print appearance and are corresponding to miller indices of ZnS, confirming the quantum size of the prepared nanoparticles. The particle size was found to vary from 2 to 4 nm. The results of the selected area electron diffraction (SAED) are in agreement with the XRD results. The peaks observed between 616 and 1103 cm⁻¹ are ascribed to cobalt and sulfur bond. The higher band gap energy obtained for the prepared nanoparticles as compared to bulk ZnS from the DRS spectra revealed quantum confinement. The intensity of the photoluminescence (PL) was found to increase with the decrease in crystallite size. The observe increase of the PL intensity is due to quantum size effect. The magnetization (M–H curve) measured at room temperature exhibited saturated hysteresis loop for higher Co concentration indicating the ferromagnetic nature of the prepared nanoparticles.

中文翻译：

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Co-ZnS杂化纳米粒子的结构，形态，光致发光和磁行为变化

采用化学沉淀法合成了共掺杂ZnS杂化纳米粒子。XRD峰随着掺杂剂浓度的增加而向更高的角度偏移，这与Co存在时的结构变化相对应。EDAX证实了所制备材料的化学组成。高分辨率透射电子显微照片（HRTEM）显示出指纹外观，并且与ZnS的米勒指数相对应，从而确认了所制备纳米颗粒的量子尺寸。发现粒径为2至4nm。所选区域电子衍射（SAED）的结果与XRD结果一致。在616和1103 cm ^-1之间观察到的峰值归因于钴和硫键。与从DRS光谱获得的整体ZnS相比，所制备的纳米颗粒获得的更高的带隙能量揭示了量子限制。发现光致发光（PL）的强度随着微晶尺寸的减小而增加。观察到的PL强度的增加归因于量子尺寸效应。在室温下测得的磁化强度（M–H曲线）显示出较高的Co浓度饱和磁滞回线，表明所制备的纳米颗粒具有铁磁性。