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Inner filter effect-based upconversion fluorescence sensing of sulfide ions.

Lanjuan Sun1, Chunning Sun2, Yang Ge1

  • 1School of Chemistry and Chemical Engineering, Southeast University, No. 2 Dongnandaxue Road, Nanjing, Jiangsu 211189, P. R. China. jczhou@seu.edu.cn.

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|September 5, 2022
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Summary

This study introduces a novel upconversion luminescence system for detecting sulfide ions. The system utilizes core-shell upconversion nanocrystals and a copper complex, achieving sensitive and selective sulfide detection.

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Area of Science:

  • Nanomaterials Science
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Upconversion nanocrystals (UCNCs) are advanced fluorescent probes for sensing.
  • Sulfide ions (S2-) are crucial analytes in environmental and biological systems.
  • Existing detection methods for sulfide ions may lack sensitivity or selectivity.

Purpose of the Study:

  • To develop a sensitive and selective quantitative detection system for sulfide ions.
  • To utilize a 980 nm excited upconversion luminescence system for sulfide detection.
  • To investigate the sensing mechanism based on inner filter effects.

Main Methods:

  • Design of core-shell NaYF4:Yb,Er@NaYF4:Yb nanocrystals (csUCNCs).
  • Formation of a triethylenetetramine-Cu complex (complex-I) for sulfide recognition.
  • Construction of an upconversion luminescence system combining csUCNCs and complex-I for sulfide detection.
  • Analysis of fluorescence quenching mechanisms, including inner filter effects.

Main Results:

  • The developed system quantitatively detects sulfide ions with a detection limit of 2.7 μM.
  • The system exhibits high selectivity towards sulfide ions, with minimal interference from other ions.
  • The fluorescence quenching mechanism was identified as primary and secondary inner filter effects.

Conclusions:

  • The designed upconversion luminescence system offers a sensitive and selective method for sulfide ion detection.
  • This approach demonstrates the potential of UCNCs as fluorescent probes in analytical chemistry.
  • The inner filter effect mechanism provides a basis for designing novel UCNC-based sensors.