论文部分内容阅读
用L-半胱氨酸作为配体,直接水相合成了CdTe量子点和核壳结构CdTe/CdS量子点;实验研究了不同回流温度和回流时间下对CdTe量子点的光学性质的影响以及改善光稳定性的方法。利用紫外-可见吸收光谱和荧光光谱表征了CdTe和CdTe/CdS量子点的光学性质;CdTe量子点的荧光发射峰在525~565nm之间,且发射峰较窄;XRD、透射电镜(TEM)测试表明合成了物相较纯、分散性较好、尺寸均匀且粒径在2~3nm的CdTe量子点,但存在光稳定性差的缺点。制备核壳结构CdTe/CdS量子点的方法对所合成的CdTe量子点的光稳定性进行改善,通过荧光发射光谱、紫外吸收光谱、透射电镜(TEM)和XRD测试对CdTe/CdS核壳量子点的形貌和性能进行了表征。
CdTe quantum dots and CdTe quantum dots with core-shell structure were synthesized by direct aqueous phase reaction using L-cysteine as ligand. The effects of CdTe quantum dots on the optical properties at different reflow temperature and reflow time were studied. Light stability method. The optical properties of CdTe and CdTe / CdS quantum dots were characterized by ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy. The fluorescence emission peaks of CdTe quantum dots ranged from 525 nm to 565 nm with narrower emission peaks. The XRD, transmission electron microscopy (TEM) The results show that CdTe QDs with pure phase, good dispersibility, uniform size and particle size of 2 ~ 3 nm have been synthesized, but they have some shortcomings such as poor photostability. CdTe quantum dots (QDs) were prepared by the method of preparing CdTe / CdS QDs. The photostability of CdTe QDs was improved by fluorescence emission spectroscopy, UV absorption spectroscopy, transmission electron microscopy (TEM) and XRD. The morphology and properties were characterized.