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Highly Sensitive and Selective Fluorescent Sensor based on a Multi-Responsive Ultrastable Amino-Functionalized Zn(II)-MOF for Hazardous Chemicals
摘要： A microscale amino-functionalized Zn(II)-MOF, namely [Zn(NH2-bdc)(4,4’-bpy)] (1) (NH2-H2bdc = 2-amino-1,4-benzenedicarboxylic acid and 4,4’-bpy = 4,4’-bipyridine), has been successfully synthesized, structurally characterized and further utilized as multi-responsive fluorescent sensor for highly sensitive and selective detection of Cr(VI) and 2,4,6-trinitrophenol (TNP). Compound 1 features non-porous 5-fold interpenetrated 3D framework with the Lewis basic sites including the uncoordinated amino and carboxylate groups on the framework for anchoring and recognizing the guest. 1 exhibits not only excellent water and thermal stability but also tolerance to acidic and basic media over an extensive pH range of 2-12. This ultrastable material can sensitively and selectively detect Cr2O7 2- and CrO4 2- in water based on the luminescent quenching with relatively low limits of detection (2.21 μM for CrO4 2- and 1.30 μM for Cr2O7 2-). Moreover, the unprecedented solvent-dependent luminescent response of 1 as a fluorescent probe for high-efficiency TNP detection was observed. Significantly, 1 not only displays high sensitive fluorescent enhancement upon TNP binding in ethanol but also exhibits fluorescent quenching toward TNP in water with very low limits of detection of 4.47 nM and 0.32 μM in ethanol and water, respectively. This work reports the first example of the utilization of MOF as a sensor for the detection of TNP based on dual responsive luminescence. Importantly, 1 can be simply and rapidly regenerated, displaying excellent recyclability after the sensing experiments.
关键词： Multi-responsive fluorescent sensors,Fluorescent quenching,Metal-organic framework,2,4,6-trinitrophenol,Fluorescent enhancement,Cr(VI)
更新于2025-11-19 16:46:39
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Magnetic nanocomposite with fluorescence enhancement effect based on amino acid coated-Fe3O4 functionalized with quantum dots
摘要： Multifunctional nanoparticles with magnetic and fluorescent properties have high potential in different areas. A very attractive feature of these nanoparticles is that they can be controlled by an external magnetic field and monitored by fluorescence. For biological applications, the magnetic nanoparticles (MNPs) must be biocompatible and dispersible in water, which requires surface modification. This paper describes the synthesis of Fe3O4 MNPs modified with three amino acids (AA): L-Tryptophan (Trp), L-Phenylalanine (Phe) and L-Tyrosine (Tyr) by a co-precipitation method in a one-step reaction without the use of a spacer agent. The potential of AA as a robust anchor was assessed by binding mercaptopropionic acid (MPA)-coated CdTe quantum dots (QDs) to Fe3O4@AA nanoparticles, leading to a hybrid nanostructure with excellent fluorescent and magnetic properties. In particular, the Fe3O4@Trp@QDs nanocomposite showed a fluorescence enhancement effect due to F?rster resonance energy transfer (FRET) from Trp as energy donor to CdTe@QDs as acceptor. The nanomaterials were characterized by high-resolution transmission electron microscopy (TEM), X-Ray diffraction (XRD), zeta potential, thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), Fourier-transform infrared (FT-IR), UV-visible, and fluorescence spectroscopy. The nanocomposite also presents high stability and good dispersibility in water. This nanomaterial may be potentially used in different biomedical and environmental applications.
关键词： amino acid as anchor,fluorescent enhancement,energy transfer,stability and dispersibility in water,Magnetic and fluorescent nanocomposite,Fe3O4-amino acid-CdTe QD
更新于2025-09-19 17:13:59