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Solution-Printable PEDOT Solid-Contact for Nitrate-Selective Electrodes: Enhanced Selectivity from Anion Dopant

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|November 9, 2022
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We developed a novel conductive material, Poly(3,4-ethylenedioxythiophene)-polyethylene glycol (PEDOT:PEG), as a solid-contact for nitrate-selective electrodes. An ion exchange treatment significantly improved electrode performance and selectivity for nitrate detection.

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Area of Science:

  • Bioelectronics
  • Materials Science
  • Electrochemistry

Background:

  • Poly(3,4-ethylenedioxythiophene)-polyethylene glycol (PEDOT:PEG) is a biocompatible conductive material used in bioelectronics.
  • While PEDOT is established for cationic solid-contact ion-selective electrodes (sc-ISEs), its use for anionic detection is less explored.

Purpose of the Study:

  • To report the first use of PEDOT:PEG as a solution-printable solid-contact for all-solid-state nitrate-selective electrodes.
  • To investigate the effect of ion exchange treatment on nitrate selectivity and electrode performance.

Main Methods:

  • Fabrication of PEDOT:PEG solid-contacts for nitrate-selective electrodes.
  • Electrochemical impedance spectroscopy to analyze electrode resistance.
  • Ion exchange treatment to remove perchlorate dopant.
  • Performance evaluation including Nernstian response, dynamic range, and selectivity.

Main Results:

  • PEDOT:PEG was successfully employed as a solid-contact for nitrate-selective electrodes.
  • Ion exchange treatment to remove perchlorate dopant significantly reduced electrode resistance.
  • The optimal electrode demonstrated a near-Nernstian response (-55.8 mV/decade) over a wide dynamic range (0.1 M to 1.12 μM).
  • Excellent Hofmeister selectivity for nitrate was achieved and maintained during prolonged use.

Conclusions:

  • PEDOT:PEG is a viable solid-contact material for all-solid-state anion-selective electrodes.
  • A simple ion exchange protocol enhances nitrate selectivity and electrode performance.
  • The developed method is suitable for scalable, flexible anion sc-ISE preparation.