Chemiluminescence Of Glutathione-CdTe Quantum Dots And Its Analytical Applications

With the development of nanoscience and nanotechnology, thechemiluminescence （CL） study has been extended to nanoparticlesystems from molecular systems. The performance of quantum dots（QDs） was different from other nanoparticles in CL systems becauseof its unique optical properties. In this paper, glutathione （GSH）-CdTeQDs with high quantum yield （QY） were synthesized. Varietyinfluencing factors of QDs CL were carefully studied, and QDs CLsystems were used for determination of cyanide and formaldehyde.The content and results of this paper are as follows:1. CdTe QDs was synthesized taking GSH as ligand. Rhodamine6Gin ethanol as a reference, the QY of CdTe QDs were determined, andmaximum QY was43%. The as-prepared QDs were more suitable forthe CL reaction in alkaline medium because of its stability. The trendof different size QDs signal changes was consistent with the trend ofQY, and the relationship between the CL spectra and fluorescence spectra of those QDs was also the same. In the alkaline system, theCL of QDs was sensitive to cations and not sensitive to anions.2. Copper ion could extremely inhibit the signal of QDs CL. The CLsystem of CdTe QDs-H₂O₂-Cu²⁺was established on this basis. Thesystem was used for determination of cyanide by copper ion as aprobe, the detection limit was6ng/mL, and the linear range was6³25ng/mL. Cyanide in river water and coking wastewater wasaccurately determined.3. Formaldehyde in indoor air was determined employing achemiluminescence flow method based on a reaction of formaldehydeand CdTe QDs with hydrogen peroxide in an alkaline solution. Thedetection limit was0.02mg/m³, and the linear range was0.02⁰.97mg/m³.