Title: Study on the optimized synthetic CdTe quantum dots in aqueous ammonia system
Abstract: 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,Cd2+、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(Cd2+)∶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%
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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