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Towards recyclable optical nitrite sensing composite structures: Design, synthesis, characterization and sensing

Xing Peng1, Xian Wei2, Tieyu Chen1

  • 1Guangxi Medical University, Nanning 530021, Guangxi, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|November 13, 2016
PubMed
Summary

New core-shell nanocomposites offer sensitive and recyclable nitrite detection. These advanced materials utilize iron oxide nanoparticles and rhodamine derivatives for precise sensing applications.

Keywords:
Core-shell structureEmission quenchingNitrite ionRhodamine probe

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Developing sensitive and selective methods for nitrite detection is crucial for environmental and biological monitoring.
  • Nanocomposite materials offer unique properties for chemical sensing applications.

Purpose of the Study:

  • To design and synthesize novel core-shell nanocomposite materials for effective nitrite sensing.
  • To investigate the structural, magnetic, and spectral properties of the prepared nanocomposites.
  • To evaluate the sensing performance, including limit of detection and sensing mechanism, for nitrite ions.

Main Methods:

  • Synthesis of Fe3O4 nanoparticles as core and MCM-41 as shell.
  • Functionalization of the core-shell structure with rhodamine derivative chemosensors.
  • Characterization using electron microscopy, N2 adsorption/desorption, magnetic measurements, IR spectroscopy, and thermogravimetric analysis.
  • Evaluation of nitrite sensing via emission quenching and determination of the limit of detection.

Main Results:

  • Successfully prepared core-shell nanocomposites with Fe3O4 nanoparticles and MCM-41 shells.
  • Characterization confirmed the core-shell structure and material properties.
  • Achieved a low limit of detection (1.1μM) for nitrite sensing.
  • Identified a static sensing mechanism involving an additive reaction with NO+.
  • Demonstrated recyclability of the nanocomposite sensors after nitrite quenching.

Conclusions:

  • The developed core-shell nanocomposites are effective materials for sensitive and selective nitrite detection.
  • The static sensing mechanism provides a reliable basis for quantitative nitrite analysis.
  • The recyclability of the sensors highlights their potential for practical applications in environmental monitoring and diagnostics.