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• W2959304880 abstract "Since inorganic phosphate ion (PO43−) plays very important roles in environment or living organisms, developing a selective and sensitive detection method for PO43− is highly desired. Owing to the superior optical properties, graphene quantum dots (GQDs) have been developed as a promising emitting material in fluorescence analysis. Herein, we reported the first example of negatively charged molybdate-mediated nitrogen doped graphene quantum dots (Mo7O246--mediated N-GQDs) as a fluorescence “off-on” probe for PO43− via “anion ion-mediated” strategy. The N-GQDs was firstly modified with Mo7O246− through a complex bonding system containing ionic and hydrogen bonds. The formation of N-GQDs/Mo7O246− complex leaded to photoluminescence (PL) quenching of N-GQDs. In the presence of PO43−, strong affinity between PO43− and Mo7O246− produced ammonium phosphomolybdate, which destroyed the pre-formed N-GQDs/Mo7O246− structure and detached Mo7O246− from N-GQDs surface. Thus, the PL of N-GQDS was in turn switched on. Under optimal conditions, this probe exhibited a good linear relationship between PL response and PO43− concentration in the range from 7.0 to 30.0 μM with a limit of detection of 50 nM. Also this probe with high selectivity and sensitivity has been successfully used to sense PO43− in natural water, biological fluid, and living cells." @default.
• W2959304880 created "2019-07-23" @default.
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• W2959304880 date "2019-11-01" @default.
• W2959304880 modified "2023-10-16" @default.
• W2959304880 title "Negatively charged molybdate mediated nitrogen-doped graphene quantum dots as a fluorescence turn on probe for phosphate ion in aqueous media and living cells" @default.
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• W2959304880 doi "https://doi.org/10.1016/j.aca.2019.07.023" @default.
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