Journal
MICROCHIMICA ACTA
Volume 186, Issue 5, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3413-x
Keywords
Fluorescence quenching; Sulfide probe; Nanomaterial; Inner filter effect; Redox reaction
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Funding
- National Natural Science Foundation of China [21205002, 21762004]
- Natural Science Foundation of Anhui Province, China [1708085MB48]
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A turn-on fluorescent sulfide probe was prepared from carbon dots (CDs; synthesized using an environmentally friendly method) and MnO2 nanosheets. In this composite probe, the fluorescence of the CDs (with excitation/emission peaks at 330/430nm) is quenched by the MnO2 nanosheets through an inner filter effect. Introducing sulfide causes the MnO2 nanosheets to be disintegrated through a redox reaction between sulfide and MnO2. Hence, the blue fluorescence of the CDs is restored. Under the optimum conditions, fluorescence increases linearly in the 2-25M sulfide concentration range. The detection limit is 0.8M. The method was used to analyze spiked real water samples, and satisfactory results were achieved.
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