Synthesis and Fluorescence Properties of Water-soluble CdTe Quantum Dots

Water-soluble CdTe quantum dots (QDs) were synthesized by using N-acetyl-L-cysteine (NAC) as modifier. The influence of acidity, the molar ratio of Cd:NAC and Cd:Te, and aging time on photoluminescence of obtained QDs had been discussed. The experimental results showed the optimum molar ratio of Cd,Te and NAC was 1:0.3:1. Particle size of QDs increased from 2.00 nm to 3.69 nm along with the extending of reaction time according to UV spectra of QDs. The water-soluble CdTe QDs were further characterized by infrared spectra(IR), and X-ray powder diffraction(XRD), and the experimental results indicated that CdTe was successfully modified by NAC.