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Potentiometry: Membrane Electrodes

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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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Nanofibrous Membrane-Based Stretchable Electrochemical Sweat Sensor for pH Detection.

Longzhou Zhang¹, Baoyuan Ma¹, Zhiguang Xu²

¹College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.

|March 13, 2025

Summary

Researchers developed a flexible, wearable electrochemical sensor for monitoring sweat pH. This stretchable sensor maintains accuracy during movement, showing promise for personal health management.

Keywords:

electrospun membrane pH detection stretchable conductive electrode wearable sweat sensor

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Area of Science:

Materials Science
Electrochemistry
Biomedical Engineering

Background:

Wearable, non-invasive sweat sensors are crucial for personal health management.
Monitoring sweat pH offers insights into metabolism and homeostasis.
Sensor stability and accuracy during body motion remain significant challenges.

Purpose of the Study:

To develop a stretchable, nanofibrous membrane-based electrochemical pH-sensing electrode.
To evaluate the sensor's sensitivity, accuracy, and stability under mechanical deformation.
To assess the potential of the sensor for wearable applications in monitoring sweat pH.

Main Methods:

Fabrication of a stretchable nanofibrous membrane by embedding multi-walled carbon nanotubes (MWCNT) and silver nanowires (AgNWs).
Electrodeposition of polyaniline onto the nanofibrous membrane to create the pH-sensing electrode.
Testing of the electrode's electrochemical performance in ionic solutions and under various mechanical strains (torsion, bending, tensile).

Main Results:

The pH-sensing electrode exhibited high sensitivity (82.53 mV/pH) and accuracy across a pH range of 3 to 7.
The electrode demonstrated stable sensing performance under deformations up to 30% tensile strain.
Sensitivity remained above 70 mV/pH even after 1000 stretching cycles at 30% strain.

Conclusions:

The developed stretchable electrochemical sensor shows excellent mechanical stability and reliable pH detection.
This wearable sensor is a promising candidate for continuous sweat pH monitoring in personal health management.
The sensor's resilience to deformation addresses key challenges in wearable health technology.