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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
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A paper based, all organic, reference-electrode-free ion sensing platform.

Johannes Kofler1, Sebastian Nau, Emil J W List-Kratochvil

  • 1NanoTecCenter Weiz Forschungsgesellschaft m.b.H., Franz-Pichler-Straße 32, A-8160 Weiz, Austria. emil.list-kratochvil@ntc-weiz.at.

Journal of Materials Chemistry. B
|April 9, 2020
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Summary
This summary is machine-generated.

We developed a novel, paper-based potassium ion (K+) sensor using two ion-selective electrodes (ISEs) and a pulsetrode concept. This reference-electrode-free platform offers enhanced sensitivity and long-term stability for ion detection.

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Area of Science:

  • Electrochemistry
  • Chemical Sensing
  • Materials Science

Background:

  • Traditional ion-selective electrodes (ISEs) often require a stable reference electrode, complicating device fabrication and use.
  • Developing simple, stable, and sensitive ion sensors is crucial for various applications, including point-of-care diagnostics.

Purpose of the Study:

  • To create a reference-electrode-free, all-organic potassium ion (K+) sensing platform on paper.
  • To enhance the sensitivity and stability of ion sensing using a novel pulsetrode concept.

Main Methods:

  • Fabrication of a paper-based sensor with two identical ion-selective electrodes (ISEs) using polymeric ion-selective membranes (ISMs) on PEDOT:PSS electrodes.
  • Utilizing a current pulse to induce ion flux between the ISEs, measuring the resulting potential difference.
  • Employing the pulsetrode concept for potentiometric measurements without a separate reference electrode.

Main Results:

  • The sensor demonstrated a 20-fold sensitivity enhancement compared to classical potentiometric measurements in physiological backgrounds.
  • The potential difference between the ISEs directly correlated with the K+ ion concentration.
  • The sensor exhibited excellent stability, with no significant change in response over three months due to mutual potential drift cancellation.

Conclusions:

  • A simple, reference-electrode-free, all-organic K+ sensing platform on paper has been successfully developed.
  • The pulsetrode concept enables highly sensitive and stable ion detection without the need for traditional reference electrodes.
  • This technology holds promise for developing cost-effective and user-friendly ion sensing devices.