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- W4387166864 abstract "This communication reports the facile hydrothermal synthesis of fluorescent two-dimensional layered MoS2 nanoflakes using a biomolecule (l-cysteine) for efficient and sensitive detection of mercury ions (Hg2+) in aqueous solution by monitoring the fluorescence quenching of MoS2 in a ratiometric approach. This fluorescence quenching of MoS2 was successfully utilized to detect Hg2+ ions in both normal (H9c2 cell line) and cancer (A549 cell line) cells as well via fluorescence imaging microscopy. The as-synthesized MoS2 nanostructured sample was characterized using UV–vis absorption, steady-state fluorescence emission, X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and Raman spectroscopy. The strong fluorescence emission of nanostructured MoS2 was heavily quenched by Hg2+ ions in aqueous medium as confirmed by fluorescence spectroscopic results. The binding of Hg2+ with MoS2 nanoflakes and the resulting fluorescence quenching were also supported by Stern–Volmer analysis. The selectivity and sensitivity of the interaction of Hg2+ ions with the as-prepared MoS2 nanoflakes among all other interfering metal ions were analyzed. The selective interaction of Hg2+ with MoS2 was also accompanied by a distinct color change from bluish-green to flaxen or pale yellowish-gray in aqueous medium. The limit of detection of Hg2+ ions in aqueous medium was 0.63 nM. The possible interactions between Hg2+ and MoS2 were confirmed by Fourier transform infrared spectroscopy, time-resolved fluorescence, and cyclic voltammetry studies. Density functional theoretical calculations provided useful information to correlate the electronic structure and energy band distributions with the spectroscopic results for the interaction of Hg2+ with MoS2 nanoflakes. The MoS2 nanoflakes showed no significant cytotoxicity during their interaction with Hg2+ ions in the intracellular medium, as confirmed by MTT assay, thereby ensuring possible future biomedical applications." @default.
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- W4387166864 date "2024-01-01" @default.
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- W4387166864 title "Spectrofluorometric detection of mercury ions in aqueous medium and cellular milieu using MoS2 nanoflakes" @default.
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- W4387166864 doi "https://doi.org/10.1016/j.jpcs.2023.111680" @default.
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