Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 269, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.120727
Keywords
Ag2S QDs/g-C3N4; Fluorescence detection; Quenching; Nitrofurazone; Multiwfn wavefunction analysis
Categories
Funding
- National Natural Science Foundation of China [51872140, 51972173]
- Science and Technology Innovative Research Team program in Universities of Jiangsu Province, China
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A novel fluorescent probe based on Ag2S QDs/g-C3N4 composite was synthesized by loading Ag2S quantum dots on the surface of g-C3N4, and it was successfully applied in the sensitive detection of Nitrofurazone. The results showed that Ag2S QDs/g-C3N4 exhibited a wide linear detection range and low detection limit for NFZ, and the fluorescence detection mechanism was revealed through experiments and theoretical calculations.
In the paper, a novel fluorescent probe based on Ag2S QDs/g-C3N4 composite was synthesized by loading Ag2S quantum dots (Ag2S QDs) on the surface of g-C3N4 through in-situ synthesis method and developed to detect Nitrofurazone (NFZ) sensitively. The results showed that the linear detection range of Ag2S QDs/g-C3N4 to NFZ was 0-30 mu M, with a low detection limit of 0.054 mu M. The results of time-fluorescenceresolved spectroscopy and UV-vis absorption spectroscopy exhibited that the possible detection mechanism of Ag2S QDs/g-C3N4 to NFZ was proposed to be Internal Filtration Effect (IFE). Moreover, Multiwfn wavefunction analysis was employed to uncover the possible interaction between the Ag2S QDs/g-C3N4 and NFZ, thereby further revealing the fluorescence detection mechanism from the scale of atoms. Combining experiments and theoretical calculations, we proposed the sensing mechanism of the formation of non-fluorescent ground state complex linked by hydrogen bonds. This work indicated that the Ag2S QDs/g-C3N4 composite processed the ability to detect NFZ efficiently and sensitively. (C) 2021 Elsevier B.V. All rights reserved.
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