Preparation and Characterization of CdTe/CdS Quantum Dots Fluorescent Detection Probe
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Abstract:
It is important to optimize the establishment of simple quantum dots preparation method and obtain the excellent quantum dots material for food safety. The core-shell CdTe/CdS quantum dots were prepared by hydrothermal method using thioglycolic acid as stabilizer. The optical properties of quantum dots were evaluated by fluorescence emission spectroscopy and UV-Vis spectra. Then, the stability of quantum dots was investigated. The results showed that the quantum dots with excellent performance were prepared under the conditions of 80 ℃ reflux, nucleation 40 min, cladding 40 min, pH=11, n(Cd2+) : n(Te2-):n(TGA)=1:0.2:7. Quantum particle size, size distribution range and fluorescence intensity varied with the change of above experimental conditions. The results of the stability study showed that the photoluminescence intensity of the prepared CdTe/CdS quantum dots increased with the irradiation time, and the quantum yield increased significantly from the 7.80% to 20.10% and reached the maximum at 11th day. The research and establishment of the preparation method can be used as a fluorescent probe to adjust the synthesis conditions according to the needs to control the size of the quantum dots and provide technical support for the detection of quality safety factors in food, which can play an important role in ensuring food safety.
