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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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A paper-based organic electrochemical transistor array with a simplified configuration for simultaneous multi-ion

Ariadna Dasca1, Pascal Blondeau1, Jordi Riu1

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Summary

This study introduces a new multi-analyte sensor array using ion-selective organic electrochemical transistors (IS-OECTs) for simultaneous detection of sodium, potassium, and ammonium ions in saliva, offering high sensitivity and selectivity.

Keywords:
ChemometricsOrganic electrochemical transistorPaper-based sensorsSalivaTransistor array

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Area of Science:

  • Electrochemistry
  • Sensor Technology
  • Analytical Chemistry

Background:

  • Organic electrochemical transistors (OECTs) offer high amplification and robust performance for analytical applications.
  • Existing analytical methods can be enhanced by versatile transistor-based sensing platforms.
  • The development of multi-analyte sensors is crucial for complex sample analysis.

Purpose of the Study:

  • To develop a compact multi-analyte transistor array with high analytical performance.
  • To create highly sensitive and selective ion-selective organic electrochemical transistors (IS-OECTs).
  • To demonstrate simultaneous detection and quantification of ions in human saliva using the developed sensor array.

Main Methods:

  • Fabrication of ion-selective organic electrochemical transistors (IS-OECTs) using thick-film technology and optimized ion-selective membranes.
  • Simplification of the sensing system with individual power supplies and a single gate electrode per OECT.
  • Integration of the IS-OECT array with multivariate models for data analysis.
  • Validation of results against established reference techniques.

Main Results:

  • The developed IS-OECTs exhibit high sensitivity and selectivity.
  • The compact multi-analyte array demonstrates outstanding analytical performance.
  • Simultaneous detection and quantification of sodium, potassium, and ammonium ions in human saliva were achieved.
  • Results were validated against reference methods, showing promising accuracy.

Conclusions:

  • The proposed IS-OECT array offers a versatile and effective platform for multi-analyte sensing.
  • The simplified system design enhances practicality and usability.
  • This technology holds significant potential for point-of-care diagnostics and environmental monitoring.
  • The developed sensing array confirms its usefulness for analyzing complex biological samples like saliva.