Journal
ANALYTICAL CHEMISTRY
Volume 88, Issue 3, Pages 1748-1752Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.5b03974
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Funding
- National Natural Science Foundation of China [21305017, 21375020]
- Specialized Research Fund for Doctoral Program of Higher Education of China [20133514110001]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT15R11]
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Nitrogen and sulfur codoped carbon-based dots (N,S-CDs) with strong blue light emission are encapsulated into red light-emitting europium metal-organic frameworks (Eu-MOFs) to form two color light-emitting nanohybrids (Eu-MOFs/N,S-CDs). In organic solvents, the encapsulated N,S-CDs are aggregated and confined in the cavities of the Eu-MOFs, exhibiting only a very weak photoluminescence (PL) signal. Therefore, the nanohybrids show red light emission of the Eu-MOFs. Contrarily, when the Eu-MOFs/N,S-CDs are dispersed in water, the encapsulated N,S-CDs are released into solution while the red light emission of the Eu-MOFs is quenched due to the effect of O-H oscillators. The nanohybrids are used as the probe for the water content in organic solvents. Take ethanol as an example; as the water content is increased from 0.2 to 30%, the nanoprobe provides distinguishable PL color change. The ratio of light intensity at 420 nm to that at 623 nm (I-420/I-623) increases linearly with increasing water content in the range from 0.05 to 4% with a low detection limit of 0.03%.
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