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A high performance fluorescence switching system triggered electrochemically by Prussian blue with upconversion

Yiwen Zhai1, Hui Zhang1, Lingling Zhang1

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A novel electrochemical fluorescence switching system utilizes Prussian blue and upconversion nanoparticles. This system effectively detects sulfite ions with high sensitivity and stability, offering a promising analytical tool.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Development of sensitive and stable fluorescence switching systems is crucial for analytical applications.
  • Upconversion nanoparticles (UCNPs) offer unique optical properties for signal generation.
  • Prussian blue (PB) is a versatile material with electrochemical and optical characteristics.

Purpose of the Study:

  • To propose and develop a high-performance fluorescence switching system triggered electrochemically.
  • To utilize Prussian blue and UCNPs for efficient fluorescence resonance energy transfer (FRET) and inner-filter effect (IFE).
  • To establish a sensitive method for detecting sulfite ions in aqueous solutions.

Main Methods:

  • Synthesis of hexagonal monodisperse β-NaYF4:Yb3+,Er3+,Tm3+ upconversion nanoparticles.
  • Manipulation of UCNP emission intensity ratio (red to green) to match Prussian blue absorption.
  • Construction of the fluorescence switching system based on FRET and IFE between UCNPs and PB.
  • Electrochemical triggering and detection of sulfite by its reduction of PB.

Main Results:

  • Successful synthesis of UCNPs with tunable emission properties.
  • Demonstration of efficient FRET and IFE between UCNPs and PB, leading to a stable fluorescence switching system.
  • Detection of sulfite ions with a low detection limit and a broad linear relationship.
  • The system exhibited high fluorescence contrast and good stability.

Conclusions:

  • The proposed electrochemical fluorescence switching system based on UCNPs and PB is effective and stable.
  • The system demonstrates excellent performance for the sensitive determination of sulfite ions.
  • This work provides a new platform for developing advanced electrochemical sensors.