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Luminescent properties of colloidal Ag2 quantum dots passivated with thioglycolic acid molecules in the presence of oxytetracycline
Russian version
Kondratenko T.S. 1, Chevychelova T. A. 1, Ovchinnikov O.V. 1, Smirnov M.S. 1, Grevtseva I.G. 1, Latyshev A.N.1
1Voronezh State University, Voronezh, Russia
Email: optichka@yandex.ru
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It was found that in the presence of oxytetracycline molecules, the spectral absorption and luminescence contours of colloidal Ag2S quantum dots, passivated with thioglycolic acid molecules are transformed. During mixing a colloidal solution of Ag2S/TGA quantum dots with antibiotic molecules, a peak at 2.5±0.2 nm appears in the absorption spectrum, and a luminescence peak shift to shorter wavelengths (from 940 nm to 860 nm) is observed in the luminescence spectrum, accompanied by an increase in its intensity. The observed regularities are caused by a change in the interface state of Ag2S/TGA quantum dot due to binding with the oxytetracycline molecule through the interaction of the tricarbonyl group with dangling bonds of the quantum dot interface and passivator molecules. It ensures the formation of new radiative recombination centers. The obtained results indicate the possibility of practical application of colloidal solution of Ag2S/TGA quantum dots as a luminescent receptor for the presence of tetracycline antibiotics in solution. Keywords: trap-state luminescence, Ag2S quantum dots, oxytetracycline, interface.
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