水溶性CdZnTe量子点制备及光谱性能

Synthesis and fluorescence properties of water-soluble CdZnTe quantum dots

以巯基丙酸(MPA)为修饰剂,在水溶液中制备出CdZnTe量子点(QDs)。研究了ZnCd摩尔比,pH,反应时间等因素对CdZnTe量子点荧光性能的影响。为了进一步改善CdZnTe量子点的水溶性,采用聚乙烯亚胺(PEI)对CdZnTe量子点进一步进行包裹,探讨了前驱体溶液pH对PEI包裹CdZnTe量子点荧光性能的影响。相比于CdTe量子点,CdZnTe量子点具有更强的荧光性能,PEI修饰的CdZnTe量子点的稳定性更好。通过荧光光谱仪,红外光谱仪,X-射线粉末衍射仪,透射电镜对所制得量子点进行了表征。

Water-soluble CdZnTe quantum dots（QDs）were synthesized in aqueous solution by using mercaptopropionic acid（MPA）as stabilizer.The influence of the molar ratio of CdZn,pHand aging time on photoluminescence of obtained QDs had been studied.To further improve the solubility of CdZnTe QDs,surfaces of water-soluble quantum dots were modified by polyethyleneimine（PEI）,and the effect of pH on CdZnTe QDs coated with PEI was discussed as well.CdZnTe QDs acquired better photoluminescence and decreased biological toxicity compared with CdTe QDs.The modification using PEI highly enhanced the luminescent property of CdZnTe QDs.The water-soluble CdZnTe QDs were characterized by fluorescence emission spectra,infrared spectra（IR）,transmission electron microscopy（TEM）,and X-ray powder diffraction（XRD）.