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Nafion Modified Titanium Nitride pH Sensor for Future Biomedical Applications.

Shimrith Paul Shylendra1, Magdalena Wajrak1, Kamal Alameh1

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Summary

Researchers enhanced a Titanium Nitride (TiN) solid-state pH sensor using Nafion modification. This innovation significantly reduces interference in redox environments, improving accuracy for biomedical applications.

Keywords:
NafionTitanium Nitride (TiN)high redox samplesmedical applicationspH sensingsmart sensors

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Electrochemistry

Background:

  • Solid-state pH sensors are crucial for biomedical applications, but performance is limited in high redox environments.
  • Existing Titanium Nitride (TiN) pH sensors exhibit a significant potential shift (30 mV) in the presence of oxidizing or reducing agents.

Purpose of the Study:

  • To enhance a previously developed TiN solid-state pH sensor for improved performance in redox-sensitive applications.
  • To minimize redox interference in pH measurements for enhanced accuracy in biomedical and industrial settings.

Main Methods:

  • Development and evaluation of a Nafion-modified TiN electrode.
  • Testing the modified electrode's performance in various mediums, focusing on redox interference.

Main Results:

  • The Nafion-modified TiN electrode demonstrated a minimal potential shift of only 2 mV in redox mediums, a substantial improvement over the standard TiN electrode.
  • The modified electrode maintained acceptable reaction times while achieving increased accuracy in highly redox samples.

Conclusions:

  • Nafion modification effectively overcomes redox interference for TiN-based pH sensors.
  • The enhanced sensor offers significant advantages over standard pH glass electrodes for medical diagnosis, real-time health monitoring, and miniaturized smart sensor development.