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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Fluorescent Metal-Organic Framework Nanoparticles for Explosive Detection.

Raymond Yu1, Tiffany Nguyen1, Victor H Cortez1

  • 1Department of Chemistry and Biochemistry, California State University Long Beach, Long Beach, California 90840, United States.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Fluorescent metal-organic framework (MOF) nanoparticles were synthesized for explosive detection. The fluorescein@ZIF-8 material shows a "turn-off" luminescent response to nitroaromatic explosives, enabling sensitive detection.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Metal-organic frameworks (MOFs) offer tunable porous structures for various applications.
  • Fluorescent materials are crucial for sensing and detection technologies.
  • Nitroaromatic compounds are common explosive residues requiring sensitive detection methods.

Purpose of the Study:

  • To synthesize fluorescent metal-organic framework (MOF) nanoparticles by doping zeolitic imidazolate framework-8 (ZIF-8) with fluorescein.
  • To investigate the structural properties, formation mechanisms, and fluorescence quenching behavior of the resulting fluorescein@ZIF-8 (F@ZIF-8) composite.
  • To evaluate the potential of F@ZIF-8 as a sensitive sensor for nitroaromatic explosives.

Main Methods:

  • One-pot synthesis of fluorescein-doped ZIF-8 nanoparticles (F@ZIF-8).
  • Experimental characterization of structural and photophysical properties.
  • Computational studies to understand formation and quenching mechanisms.
  • Testing the luminescent response to various nitroaromatic explosives.

Main Results:

  • F@ZIF-8 nanoparticles were successfully synthesized, encapsulating fluorescein within ZIF-8 cages via electrostatic interactions.
  • The ZIF-8 scaffold mitigated fluorescein's aggregation-caused quenching (ACQ) effect, enhancing quantum yield to 69.7 ± 0.1%.
  • The F@ZIF-8 material exhibited a luminescent "turn-off" response to nitroaromatic explosives, with high sensitivity towards 2,4,6-trinitrophenol (TNP) (LOD = 2 μM).

Conclusions:

  • The synthesized F@ZIF-8 composite demonstrates effective solid-state fluorescence and selective quenching upon exposure to nitroaromatic explosives.
  • This work presents a promising strategy for designing luminescent porous materials for "signal-off" sensing applications.
  • Luminescent MOFs show significant potential as analytical tools for the rapid and sensitive detection of explosive compounds.