以无水氯化锌,硫代乙酰胺为原料,采用声化学法在低温成功制备了六方纤锌矿相硫化锌(α-ZnS)纳米晶,并对其反应机理作了初步探讨.采用X射线粉末衍射(XRD),示差扫描量热分析(DSC),透射电子显微镜(TEM)以及选区电子衍射分析(SAED)对所制得的纳米粉末进行了表征.结果表明:所制备ZnS为六方纤锌矿结构,粒子尺寸大约在20～30 nm.合成ZnS纳米粒子的形貌接近于球形,选区电子衍射图中三个衍射环分别对应于α-ZnS的(002)、(110)和(112)晶面.在超声辐射下,反应溶液体系首先生成具有六方结构的碱式氯化锌(Zn_5(OH)_8Cl_2·H_2O),为α-ZnS纳米粒子的生长提供了很好的模板.
Wurtzite zinc sulfide (α-ZnS) nanocrystallites were synthesized successfully by a sonochemical process using zinc chloride and thiacetamide as raw materials. The as-prepared ZnS nanocrystallites were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy(TEM) and selected area eletron diffraction (SAED). Results show that the as-prepared ZnS nanocrystallites are in hexagonal structure with sphere morphologies and the particle size is about 20-30 nm. The three diffraction rings in the SAED image could be identified corresponding to the crystall face of (002), (110) and (112) of α-ZnS, respectively. Researching on the reaction mechanism indicates that under the ultrasonic irradiation, simonkolleite (Zn_5(OH)_8Cl_2·H_2O) is generated firstly in the reaction system, which is in a hexagonal structure, and it provides a good template for the growth of α-ZnS nanoparticles.
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