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A composite nanosensing array with two response channels for trinitrobenzoic acid optical test.

Bing Li1, Wei Sun1, Yucheng Wu2

  • 1School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 17, 2020
PubMed
Summary

This study presents a novel composite platform for optical sensing of 2,4,6-trinitrobenzoic acid (TBA). The platform offers dual, self-calibrated sensing channels with high selectivity and a low limit of detection.

Keywords:
Composite structureLuminescenceNanosensing arrayOptical test

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Accurate detection of 2,4,6-trinitrobenzoic acid (TBA) is crucial for safety and environmental monitoring.
  • Existing sensing methods often lack selectivity or require complex instrumentation.

Purpose of the Study:

  • To develop a composite sensing platform for the optical detection of 2,4,6-trinitrobenzoic acid (TBA).
  • To achieve a self-calibrated, ratiometric fluorescent and colorimetric sensing system.
  • To investigate the sensing mechanism and evaluate performance metrics like selectivity and limit of detection.

Main Methods:

  • Fabrication of a composite sensing platform using luminescent rare earth MOF and a rhodamine-derived probe.
  • Structural characterization using XRD, IR, and TGA.
  • Photophysical measurements including emission spectra, absorption spectra, and lifetime analysis.
  • Evaluation of sensing performance towards TBA, including selectivity and limit of detection (LOD).

Main Results:

  • The composite structure was successfully synthesized and characterized.
  • A ratiometric fluorescent sensing mechanism was observed, with rhodamine emission enhanced and Eu(III) emission quenched by TBA.
  • Colorimetric sensing was achieved through changes in rhodamine absorption.
  • Both sensing channels exhibited high selectivity and linear response towards TBA with an LOD of 2.4 μM.
  • The sensing mechanism involves TBA-released protons and energy transfer (ET) from EuBTC to TBA.

Conclusions:

  • The developed composite platform enables dual-channel optical sensing of TBA.
  • The self-calibrated ratiometric fluorescence and colorimetric detection offer high selectivity and sensitivity.
  • The sensing platform demonstrates potential for naked-eye detection of TBA.