溶剂热处理对ZnS和CdS超细粉末结构形貌的影响

Effects of solvent thermal treatment on structures and morphologies of ZnS and CdS ultrafine powders

采用均相沉淀法制备单分散的ZnS和CdS纳米微粒,考察了溶剂热处理对CdS和ZnS粉末结构形貌的影响。结果表明:采用溶剂热处理,粉末形状呈现负离子配位多面体生长特征,闪锌矿型ZnS粉末由球形变为双锥状或四面体状,颗粒上有明显的电子衍射花纹;闪锌矿型CdS晶体粉末主要呈四面体形状,而纤锌矿型CdS晶体粉末则以锥状为主,并且粉末的晶型随溶剂热处理温度的升高和时间的延长更趋于完整。该工艺能同时进行脱水、除杂和晶化,具有防止氧化、有机试剂易于回收和能工业化等优点。

A novel homogenous precipitation method was developed for the preparation of monodisperse ZnS and CdS ultrafine particles, and the effects of solvent thermal treatment on the structures and morphologies of ZnS and CdS particles were investigated. The results show that the particles character as the growth of anion coordination tetrahedron during solvent thermal treatment, where blendetype ZnS particle is in the shape of double cone or tetrahedron, blendtype CdS appears as the tetrahedron, but wurtzitetype CdS is in the shape of cone. In addition, the particles with the better crystallinity are obtained with the increase of solvent thermal treatment temperature and time. This technology has such advantages as moving water and impurities, protecting CdS from oxidation and easily recycling organic reagent and so on.