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Charge-transfer-based terbium MOF nanoparticles as fluorescent pH sensor for extreme acidity
- Qi, Zewan, Chen, Yang
- Biosensors & bioelectronics 2017 v.87 pp. 236-241
- acidity, biosensors, fluorescence, ions, ligands, nanoparticles, pH, protons, terbium
- Newly emerged metal organic frameworks (MOFs) have aroused the great interest in designing functional materials by means of its flexible structure and component. In this study, we used lanthanide Tb³⁺ ions and small molecular ligands to design and assemble a kind of pH-sensitive MOF nanoparticle based on intramolecular-charge-transfer effect. This kind of made-to-order MOF nanoparticle for H⁺ is highly specific and sensitive and could be used to fluorescently indicate pH value of strong acidic solution via preset mechanism through luminescence of Tb³⁺. The long luminescence lifetime of Tb³⁺ allows eliminating concomitant non-specific fluorescence by time-revised fluorescence techniques, processing an advantage in sensing H⁺ in biological media with strong autofluorescence. Our method showed a great potential of MOF structures in designing and constructing sensitive sensing materials for specific analytes directly via the assembly of functional ions/ligands.