Abstract
A tunable interaction between Fe-MOFs (MIL-53(Fe) and kojic acid (KA)-functional copper nanoclusters (Cu NCs) has been studied. When introducing MIL-53(Fe), the Fe-O bonds can be formed between the KA on the surface of Cu NCs and MIL-53(Fe), which will induce the electron transfer from Cu NCs to MIL-53(Fe) and fluorescence quenching of Cu NCs. By introducing S2- itoccupies the Fe-site of MIL-53(Fe) and impede the interaction between Cu NCs and MIL-53(Fe), rendering a "turn-on" fluorescence signal. Thus, the KA-Cu NC/MIL-53(Fe) pair is designed as fluorescence sensing for S2-, which displays a low detection limit of 18.6nM and a wide linear detection range from 0.05 to 5µM by fitting the fluorescence intensity at maximum wavelength of 500nm with excitation at 400nm. It was also applied to monitor S2- in water samples and food additives with satisfactory results, demonstratingthe practicability and reliability of the sensing strategy based on the tuable MOF-Cu NC interactions.
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