Multifunctional Motion Sensing Enabled by Laser-Induced Graphene.

Area of Science:

• Materials Science
• Sensor Technology
• Nanotechnology

Background:

• Flexible sensors based on laser-induced graphene (LIG) are gaining traction.
• Polyimide (PI) is commonly used for LIG generation, but its limited mechanical extensibility hinders sensor development.
• There is a need for improved methods to create robust and versatile LIG-based flexible sensors.

Purpose of the Study:

• To develop a novel method for transferring laser-induced graphene (LIG) onto a flexible substrate using medical polyurethane (PU) tape.
• To create high-performance flexible and wearable sensors based on the LIG/PU composite structure.
• To demonstrate the potential of these sensors for human motion monitoring and tactile sensing.

Main Methods:

• Laser ablation of polyimide (PI) to generate LIG.
• Transfer of LIG from PI to medical polyurethane (PU) tapes.
• Characterization of LIG properties under varying laser powers and transfer conditions.
• Fabrication and optimization of LIG/PU strain and capacitive pressure sensors.

Main Results:

• A simplified and time-efficient LIG transfer process using PU tape was established.
• The LIG/PU strain sensor achieved a high gauge factor (GF) of 263.6 within a 75-90% strain range.
• A capacitive pressure sensor for tactile sensing was successfully designed using the LIG/PU composite structure.

Conclusions:

• The LIG/PU composite structure offers a promising platform for high-performance flexible sensors.
• The developed method provides a simple, fast, and low-cost approach for creating multifunctional sensor systems.
• These flexible sensors have broad application prospects in human motion monitoring and sports event analysis.