Sweat analysis with a wearable sensing platform based on laser-induced graphene

Area of Science:

• Materials Science
• Biomedical Engineering
• Analytical Chemistry

Background:

• Laser scribing offers a direct fabrication method for conductive graphene-based materials.
• Wearable sensors for noninvasive biofluid analysis are crucial for rapid health status evaluation.
• Laser-induced graphene (LIG) presents a promising material for flexible electronic devices.

Purpose of the Study:

• To develop a fully laser-manufactured wearable sensing platform using LIG for sweat analysis.
• To characterize LIG electrodes for electrochemical detection of key biomarkers.
• To validate the device's performance in real-world conditions and assess its biocompatibility.

Main Methods:

• Fabrication of a two-layer wearable sensor with LIG porous electrodes on a polyimide sheet.
• Characterization of LIG electrodes, including surface properties and electrochemical behavior.
• Electrochemical detection of uric acid, tyrosine, pH, and ion concentrations in sweat.
• In vitro cytotoxicity testing on the A549 cell line.

Main Results:

• LIG electrodes successfully detected uric acid and tyrosine electrochemically.
• Modified LIG electrodes enabled sensitive and selective pH voltammetric measurements.
• Electrochemical impedance spectroscopy accurately measured ion concentrations in sweat.
• The wearable sensor performed effectively during real-world use and showed no cytotoxicity.

Conclusions:

• The developed LIG-based wearable sensor platform enables comprehensive, noninvasive sweat analysis for health monitoring.
• Laser manufacturing offers a scalable and efficient approach for creating advanced wearable biosensors.
• The device demonstrates potential for personalized and continuous health assessment through sweat analysis.