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Ionomer-Based Ion-Sensitive Field-Effect Transistor for Lithium Ion Sensing.

Tuluhan Olcayto Colak1, Mehmet Kurt1, Ecenaz Yaman1

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This study presents a simple ion-sensitive field-effect transistor (ISFET) device for detecting lithium ions in solutions. The developed device demonstrates a sensitivity of 2.85 mA/decade and a detection limit of 77 μM.

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Area of Science:

  • * Electrochemistry
  • * Materials Science
  • * Biomedical Engineering

Background:

  • * Lithium is crucial for treating bipolar disorder, necessitating accurate detection methods.
  • * Existing lithium detection methods may lack simplicity or sensitivity.
  • * Ion-sensitive field-effect transistors (ISFETs) offer potential for electrochemical sensing applications.

Purpose of the Study:

  • * To develop a straightforward ISFET-based device for lithium ion detection.
  • * To evaluate the performance of the developed device across a range of lithium concentrations.
  • * To model the device behavior using COMSOL Multiphysics for enhanced understanding.

Main Methods:

  • * Fabrication of a zinc oxide-based ISFET device incorporating a Nafion 115 membrane.
  • * Conditioning the Nafion membrane to facilitate lithium ion transport from the electrolyte to the transistor.
  • * Testing the device's response to lithium ion concentrations from 10-2 M to 10-7 M and COMSOL Multiphysics modeling.

Main Results:

  • * The ISFET device successfully detected lithium ions in solution.
  • * The device exhibited a sensitivity of 2.85 mA/decade.
  • * A detection limit of 77 μM was achieved for lithium ions.

Conclusions:

  • * The developed ISFET device provides a simple and effective method for lithium detection.
  • * The device shows promise for clinical applications requiring lithium ion monitoring.
  • * Further optimization could enhance sensitivity and expand the detection range.