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Year 2021 Volume 19, Issue 4 |
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Issues/2021/vol. 19 /Issue 4 |
V. P. Mitsai, Ya. P. Lazorenko, A. G. Misyura, and S. O. Mamilov
«Gas-Sensing Fluorescent Nanostructured Composites with Coumarin Dyes and CdTe Semiconductor Nanoparticles for Non-Invasive Medical Diagnostics
»
0941–0952 (2021)
PACS numbers: 07.07.Df, 33.50.Dq, 42.62.Be, 61.46.Df, 78.67.Hc, 81.07.Ta, 87.64.kv
The paper presents the results of the study of the spectral-luminescent properties of solutions and nanostructured composites, which include some coumarin dyes (coumarin 4, coumarin 7), semiconductor nanocrystals (CdTe quantum dots), as well as values of their spectral shifts depending on the medium. The effect of enhancing the fluorescence intensity of coumarin dyes by CdTe quantum dots through nonradiative energy transfer is revealed. The fluorescence sensitivity of the synthesized systems to ammonia and acetone vapours in the air is shown, that manifests itself by means of the decrease in the fluorescence intensity proportional to the analyte concentration. For ammonia, the response to a vapour concentration of 10 p.p.m. is 13.2 ± 0.6%, and for 5000 p.p.m., it is 74.0 ± 1.1%. For acetone, the response to a vapour concentration of 33 p.p.m. is 0.56 ± 0.08%; for 67 p.p.m., it is 1.2 ± 0.1%, and for 133 p.p.m., it is 2.2 ± 0.1%. Recovery of sensory properties of such systems after desorption of analytes’ molecules is revealed. The created nanostructured composites are promising as sensor elements of devices for non-invasive medical diagnostics of several pathologies, such as lung cancer, liver and kidney diseases, diabetes mellitus, heart failure, pancreatitis, by determining the concentrations of their biomarkers in human exhaled air: ammonia and acetone.
Key words: sensor, coumarin dyes, acetone, ammonia, fluorescence, quantum dots
https://doi.org/10.15407/nnn.19.04.941
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