一锅法水相制备发白光的Zn_xCd_(1-x)Se量子点

One-pot synthesis of white-light-emitting Zn_xCd_(1-x)Se nanocrystals in aqueous solution

以Na2SeO3,CdCl2.2.5H2O为Se源和Cd源,还原型谷胱甘肽(GSH)作为还原剂和稳定剂,真正成功实现了一锅法水相制备发白光ZnxCd1-xSe量子点(QDs),通过调节Zn2+与Cd2+的比例改变ZnxCd1-xSe量子点的光学性质。实验结果表明,当Zn/Cd比增大时,ZnxCd1-xSe量子点的荧光光谱和激子吸收峰均发生蓝移,证明这种混晶量子点的形成,而且,Zn0.89Cd0.11Se的光学性能最佳。通过粉末X射线衍射仪(XRD)、透射电子显微镜(TEM)表征所制备的样品是立方体结构,粒径约为3 nm。并将一定量的量子点与不同体积血红蛋白结合,为以后量子点在生物标记及医学检测中的应用奠定了工作基础。

ZnxCd1-xSe QDs were really synthesized with one- pot in aqueous solution with Na2SeO3 ,CdCl2·2. 5H2O as Se and Cd source, glutathione （GSH） as ligand and reducing agent,The optical properties of the QDs were highly depend- ent on the molar ratio of Zn^2＋ to Cd^2＋ . A systematic blue shift in the fluorescence emission with an increase in the Zn con- tent,was observed, which prove the formation of ZnxCd1-xSe QDs.