水溶性CdTe量子点合成条件的优化

Optimization of Synthesis Conditions of the Water-soluble Cd Te Quantum Dots

用巯基丙酸作为稳定剂,在水相中合成了发光可调的核壳型半导体纳米粒子.用X射线衍射仪、透射电镜、荧光显微镜,荧光光谱及紫外可见光谱等对合成的核壳型Cd Te/Cd S量子点进行了光学性能、粒子的分散性、纳米粒子形貌和晶型的表征.通过对合成条件的摸索,总结出了合成高性能水溶性Cd Te/Cd S量子点的优化条件是:反应初始p H为11,Cd2+∶HTe-∶MPA为1∶0.25∶1.8,回流时间为1 h.在优化条件下通过控制合成回流时间可合成不同粒径的量子点,其荧光发射光谱在510-610 nm范围连续可调.

Mercaptopropionic Acid（ MPA） was used as a stabilizer in the aqueous synthesis phase of tunable light-emitting core- shell semiconductor nanoparticles. XRD,TEM,fluorescence microscopy, fluorescence spectroscopy and UV- Vis spectra presented the optical properties, particle dispersion, nanoparticle morphology and crystal form of the synthesized Cd Te / Cd S quantum dots. By exploring the synthesis conditions,this paper sums up that the optimal conditions of synthesizing high- performance water- soluble Cd Te / Cd S quantum dots are： the initial reaction p H is 11,Cd2 ＋∶ HTe-∶ MPA 1 ∶ 0. 25 ∶ 1. 8, reaction time 1 h, etc. Quantum dots of different size can be synthesized in the process by controlling the reaction time under the optimized conditions, the fluorescence emission spectra of which can be a continuously djustable in the range of 510- 610 nm.