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Tunable Ion-Sensing Using Coulometric-Based Protocols with Permselective Nanomembranes.

Nuria Martínez-Lorca1, Yujie Liu2, Gregorio Laucirica1

  • 1UCAM-SENS, Universidad Católica San Antonio de Murcia, UCAM HiTech, Avda. Andrés Hernández Ros, 1, Murcia 30107, Spain.

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This summary is machine-generated.

This study presents a novel all-solid-state ion-selective electrode (ISE) for potassium ion (K+) detection. The coulometric sensor offers tunable, reversible responses for real-world samples in clinical and environmental monitoring.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for ion detection.
  • All-solid-state ISEs offer advantages in portability and stability.
  • Coulometric detection provides a quantitative measure of ion transfer.

Purpose of the Study:

  • To develop and validate an all-solid-state ISE using permselective nanomembranes for coulometric detection.
  • To demonstrate the detection of potassium ions (K+) using two distinct electrochemical protocols (anodic and cathodic).
  • To assess the sensor's performance in real-world samples and its potential for microfluidic integration.

Main Methods:

  • Fabrication of an ISE with an ITO glass substrate, poly(3-octylthiophene) (POT) layer, and potassium-selective nanomembrane.
  • Implementation of cathodic and anodic electrochemical protocols using linear sweep voltammetry and chronoamperometry.
  • Signal integration to quantify K+ charge and determine concentration proportionality.

Main Results:

  • Demonstrated direct proportionality between integrated charge and K+ concentration.
  • Identified distinct response ranges: 3-20 μM (cathodic) and 200-1000 nM (anodic).
  • Achieved excellent repeatability and reversibility with the cathodic protocol; validated in human urine, horse serum, canal water, and KCl solutions.

Conclusions:

  • The developed coulometric ISE is suitable for quantifying K+ in diverse real samples across nanomolar to micromolar concentrations.
  • The sensor's design is adaptable for detecting other ions and integrating into microfluidic devices for reduced sample volume.
  • The technology shows significant promise for clinical diagnostics and environmental monitoring applications.