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Highly Stretchable Sensor Based on Fluid Dynamics-Assisted Graphene Inks for Real-Time Monitoring of Sweat.

Min Sik Kil¹, Seo Jin Kim¹, Hong Jun Park¹

¹Department of Chemical Engineering, Kangwon National University, Samcheok 25913, Republic of Korea.

ACS Applied Materials & Interfaces

|October 12, 2022

Summary

Highly stretchable and conductive graphene inks were developed for wearable electronics. These inks enable robust electrochemical sensors for real-time sweat sodium ion monitoring during exercise.

Keywords:

Ecoflex electrochemical sensor graphene real-time monitoring sweat

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Area of Science:

Materials Science
Nanotechnology
Electrochemistry

Background:

Graphene inks are promising for printed wearable electronics due to conductivity and printability.
Existing graphene inks require improvements in conductivity, stretchability, and mass production for real-time monitoring sensors.

Purpose of the Study:

To develop highly stretchable and conductive graphene inks for advanced wearable sensors.
To create and evaluate electrochemical sensors for sodium ion detection on flexible substrates.

Main Methods:

Utilized fluid dynamics-assisted exfoliation of graphite and mixing with Ecoflex to create graphene inks.
Printed serpentine-patterned conductors on textile substrates.
Fabricated electrochemical sensors for potentiometric sodium ion detection.

Main Results:

Achieved highly stretchable and conductive graphene inks with stable resistance up to 150% strain.
Demonstrated high potentiometric sensing ability of fabricated sodium ion sensors under deformation.
Successfully performed real-time on-body monitoring of sodium ion concentration in human sweat during cycling.

Conclusions:

Developed advanced graphene inks suitable for highly stretchable and conductive printed electronics.
Demonstrated the potential of these inks for robust wearable electrochemical sensors for physiological monitoring.
Validated the on-body performance for real-time sweat analysis during physical activity.