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以醋酸镉[Cd(CH3COO)2·2H2O]和硫代硫酸钠(Na2S2O3·5H2O)为镉源和硫源,采用微波水热法制备了具有球形团簇结构的CdS微晶。研究了微波水热温度、时间以及n(S)/n(Cd)(摩尔比)等因素对合成CdS团簇结构的物相和微观形貌的影响以及样品的光学性能。结果表明:以Cd(CH3COO)2·2H2O为镉源合成的CdS微晶具有球形团簇结构的特殊形貌,CH3COO–在形成该球形团簇结构的过程中起到了模板剂的作用。水热反应温度升高与时间延长有利于产物结晶性增强,晶粒尺寸也会随之增大。随着n(S)/n(Cd)的增大,产物CdS会出现由团簇结构逐渐转变为准球形结构的规律变化。UV–Vis光谱研究表明,所制备的CdS微晶具有较强的可见光吸收特性,存在一定红移现象。
CdS microcrystals with spherical clusters were prepared by microwave hydrothermal method using cadmium acetate [Cd (CH3COO) 2 · 2H2O] and sodium thiosulfate (Na2S2O3 · 5H2O) as sources of cadmium and sulfur. The effects of microwave hydrothermal temperature, time and n (S) / n (Cd) (molar ratio) on the phase and morphology of the synthesized CdS clusters and the optical properties of the samples were investigated. The results show that the CdS microcrystal synthesized with Cd (CH3COO) 2 · 2H2O as a cadmium source has a special morphology of spherical cluster structure, and CH3COO- acts as a template in the formation of the spherical cluster structure. Hydrothermal reaction temperature and time extension is conducive to product crystallinity enhancement, the grain size will also increase. With the increase of n (S) / n (Cd), the product CdS will appear the regular change from the cluster structure to the quasi-spherical structure. The results of UV-Vis spectroscopy show that the prepared CdS crystallites have strong visible light absorption and some red shift.