氨系水相优化合成CdTe量子点的研究

摘要

用巯基丙酸（MPA）作稳定剂，无需氮气或氩气保护下，在氨系水相中通过超声合成CdTe量子点的前驱体，前驱体经水浴回流制备粒径可调的CdTe量子点．通过荧光和吸收光谱、透射电子显微镜和红外光谱对产物进行了表征．试验表明：反应时间、温度、pH值、Cd^2＋、HTe^-、MPA的物质的量比，对量子点的粒径大小、粒径分布和粒径生长速度均有很大的影响．n（HTe^-）：n（Cd^2＋）：n（MPA）：1：3：6，pH=9．8条件下合成前驱体，在92＋1℃水浴下回流，可以快速获得长波长、高荧光的CdTe量子点，合成的量子点储存6个月后经稳态／瞬态荧光光谱仪测定，外量子效率仍为16．45％．%With the mercaptopropionic acid (MPA) as the stabilizer, and without the protection of nitrogen and argon, the precursor of CdTe Quantum Dots was synthesized by ultrasound in aqueous ammonia system and prepared by water bath circumfluence particle size adjustable CdTe quantum dots. The products were characterized through fluorescence and absorption spectroscopy, transmission electron microscopy and infrared spectroscopy. Experiments showed that: the reaction time, temperature, pH value, Cd^2+ ,HTe^-,MPA and the ratio of amount of substance had a great effect on the particle size of CdTe quantum dots, particle size distribution and the rate of growth. When n (HTe^-):n (Cd^2+):n (MPA) = 1:3:6, Ph = 9.8, the precursor, reflux at 92±1 ℃ under water bath could quickly obtain long wavelength and fluorescent CdTe Quantum Dots. After the synthesized quantum dots were stored for six months and determined by the steady state/transient state fluorescence spectrometer, the external quantum efficiency was still 16.45%.