Nafion Modified Titanium Nitride pH Sensor for Future Biomedical Applications
Journal
Sensors
Journal Volume
23
Journal Issue
2
Pages
1
Date Issued
2023-01-07
Author(s)
Abstract
pH sensors are increasingly being utilized in the biomedical field and have been implicated
in health applications that aim to improve the monitoring and treatment of patients. In this work,
a previously developed Titanium Nitride (TiN) solid-state pH sensor is further enhanced, with the
potential to be used for pH regulation inside the human body and for other biomedical, industrial,
and environmental applications. One of the main limitations of existing solid-state pH sensors is their
reduced performance in high redox mediums. The potential shift E0 value of the previously developed
TiN pH electrode in the presence of oxidizing or reducing agents is 30 mV. To minimize this redox
shift, a Nafion-modified TiN electrode was developed, tested, and evaluated in various mediums. The
Nafion-modified electrode has been shown to shift the E0 value by only 2 mV, providing increased
accuracy in highly redox samples while maintaining acceptable reaction times. Overcoming the
redox interference for pH measurement enables several advantages of the Nafion-modified TiN
electrode over the standard pH glass electrode, implicating its use in medical diagnosis, real-time
health monitoring, and further development of miniaturized smart sensors
Subjects
pH sensing; high redox samples; Titanium Nitride (TiN); Nafion; smart sensors; medical applications
Publisher
MDPI
Type
journal article
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