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<p>Graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) has emerged as a promising candidate for fluorescence sensing applications due to its unique photo-physical properties. Nevertheless, the practical implementation of g-C<sub>3</sub>N<sub>4</sub>-based probes has been significantly constrained by their inherent limitations, particularly low quantum yield and insufficient recognition specificity. Here, we report an oxygen-doped g-C<sub>3</sub>N<sub>4</sub>-MOF composite (OCNS@1M) that demonstrates enhanced fluorescence emission characteristics and aqueous dispersibility. A remarkable enhancement in quantum yield from 13% for pristine OCNS to 93% for the optimized OCNS@1M composite were achieved. The implementation of an OCNS@1M-based ratiometric fluorescence sensing platform effectively mitigated interference signals, thereby significantly improving the reliability of detection. This advancement enabled the sensitive quantification of besifloxacin residues in complex environmental matrices. This study provides substantial potential for constructing ratiometric fluorescence sensors based on g-C<sub>3</sub>N<sub>4</sub>-MOF probes for environmental pollutant monitoring.</p>

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Ratiometric fluorescence sensing of besifloxacin based on oxygen-doped g-C3N4-MOF composite interface

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Min Zhang,
  • Chenyang Huang,
  • Chao He,
  • Xing Zhang,
  • Jie Zheng,
  • Lei Lin

摘要

Graphite carbon nitride (g-C3N4) has emerged as a promising candidate for fluorescence sensing applications due to its unique photo-physical properties. Nevertheless, the practical implementation of g-C3N4-based probes has been significantly constrained by their inherent limitations, particularly low quantum yield and insufficient recognition specificity. Here, we report an oxygen-doped g-C3N4-MOF composite (OCNS@1M) that demonstrates enhanced fluorescence emission characteristics and aqueous dispersibility. A remarkable enhancement in quantum yield from 13% for pristine OCNS to 93% for the optimized OCNS@1M composite were achieved. The implementation of an OCNS@1M-based ratiometric fluorescence sensing platform effectively mitigated interference signals, thereby significantly improving the reliability of detection. This advancement enabled the sensitive quantification of besifloxacin residues in complex environmental matrices. This study provides substantial potential for constructing ratiometric fluorescence sensors based on g-C3N4-MOF probes for environmental pollutant monitoring.