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A novel flexible electrode using reduced graphene sheets (RGSs) offers rapid sulfide detection. This all-solid contact ion-selective electrode (ASC-ISE) shows high sensitivity and stability for environmental monitoring.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Sulfide detection is crucial for environmental monitoring.
  • Developing sensitive and selective electrochemical sensors is an ongoing challenge.
  • All-solid-contact ion-selective electrodes (ASC-ISEs) offer advantages in portability and stability.

Purpose of the Study:

  • To develop a novel, high-flexibility ASC-ISE for rapid sulfide detection.
  • To utilize reduced graphene sheets (RGSs) as an ion-to-electron transducer.
  • To evaluate the analytical performance and practical applicability of the developed sensor.

Main Methods:

  • Fabrication of ASC-ISEs using electrodeposited reduced graphene sheets (RGSs) on a silver wire.
  • Preparation of a nanostructured silver sulfide (Ag2S) selective membrane via electrodeposition.
  • Characterization of RGSs and Ag2S membranes using scanning electrochemical microscopy.
  • Evaluation of sensor performance including linear range, selectivity, stability, and detection limit.

Main Results:

  • The ASC-ISE demonstrated a linear response to sulfide concentration from 0.50 μM to 1.0 mM.
  • A low detection limit of 0.18 μM for sulfide was achieved.
  • The sensor exhibited excellent selectivity against common interfering ions.
  • Stable electrochemical responses were maintained for over 7 days.
  • Successful application in real-world samples like tap water and seawater.

Conclusions:

  • Reduced graphene sheets (RGSs) are a promising material for ion-to-electron transduction in ASC-ISEs.
  • The developed high-flexibility ASC-ISE provides a sensitive, selective, and stable platform for rapid sulfide detection.
  • The sensor shows significant potential for practical applications in environmental water quality monitoring.