以淀粉为分散剂微波辅助合成ZnS∶Co纳米晶

Mircowave-assisted Synthesis of ZnS∶Co Nano-crystallite Using Starch as Dispersing Agent

以乙酸锌为锌源,以氯化钴为钴源,以硫代乙酰胺为硫源,以淀粉为分散剂,微波辅助合成了ZnS∶Co粉体,通过X射线衍射仪(XRD)、荧光分光光度计和激光粒度分析仪对其物相、光学性能和粒径大小进行了表征分析。研究了掺杂离子Co^(2+)浓度对样品结构和光学性能的影响。结果表明,样品具有闪锌矿立方相结构,Co^(2+)进入Zn S晶格内部;掺杂量为1%时,荧光强度最高;当Co^(2+)的浓度增加至2%时,发生了浓度淬灭现象。这是由于掺杂离子浓度增加,无辐射跃迁增加引起的。

Using zinc acetate as zinc source, cobalt chloride as cobalt source, thioacetamide as sulfur source, starch as a dispersing agent, Zn S∶Co nano-crystallite is prepared via microwave-assisted process. Phase composition, optical properties and particle sizes are characterized by X-ray diffraction（XRD）, fluorescence spectrophotometer and laser particle size analyzer. The effects of different amounts of Co^2＋ ions doped on the structure and optic property of the samples are investigated. Results show that the samples have sphalerite cubic phase, and Co^2＋ ions are doped into the Zn S structure. The fluorescence spectra shows that Co^2＋（1%）-doped Zn S has the maximum luminescence intensity and when the concentration of Co^2＋ increases to 2%, concentration quenching happens. That is may be due to the increase in the radiationless transition by the higher concentration of the Co^2＋ ions.