期刊
MICROCHIMICA ACTA
卷 187, 期 9, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-020-04508-z
关键词
Zeolitic imidazolate framework-8; Carbon quantum dots; Fluorescent metal nanoclusters; Ratiometric fluorescence nanoprobe; Hg(II) ions; Dual-emission nanocomposites; Visual determination; Fluorescence quenching; Water samples; Quantum yields
资金
- National Natural Science Foundation of China [41771342, 31872889]
- Natural Science Foundation of Shandong Province, China [ZR2019MD025, ZR2017BB064]
- Key R&D Program of Shandong Province, China [2018YYSP029]
- 13th Five-Year National Key R&D Program of China [2017YFD0801504]
- Funds of Shandong Double Tops Program, China [SYL2017XTTD01]
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Dodd Walls Centre for Photonic and Quantum Technologies
- Ministry of Business Innovation and Employment (MBIE) Catalyst Fund [MAUX1609]
Carbon dots and gold nanoclusters co-encapsulated by zeolitic imidazolate framework-8 (CDs/AuNCs@ZIF-8) have been obtained at room temperature. The composite has been applied to the ratiometric fluorescence determination of mercury(II). The composite shows fluorescence emission maxima at 440 and 640 nm under 360 nm excitation, due to the CDs and AuNCs, respectively (associated quantum yields were 18% and 17%, respectively). In the presence of Hg2+, the fluorescence at about 640 nm is quenched, while the fluorescence at about 440 nm is unaffected. The CDs/AuNCs@ZIF-8 composite allows the sensitive detection of Hg2+, with the fluorescence intensity ratio (I-640/I-440) decreasing linearly with Hg2+ concentration over the range 3-30 nM. The fluorescence emission of the composite changes color from red to blue with increasing Hg2+ under UV excitation, which can easily be discerned visually. This visual detection of Hg2+ is due to the high fluorescence quantum yields of the CDs and AuNCs and the similar to 200 nm separation between the two emission maxima.
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