Stretchable Sensors and Electro-Thermal Actuators with Self-Sensing Capability Using the Laser-Induced Graphene...

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• Laser-induced graphene (LIG) is a versatile method for fabricating graphene patterns.
• Polyimide (PI) films are suitable substrates for LIG fabrication.
• Graphene-based materials show promise for flexible electronics.

Purpose of the Study:

• To investigate the fabrication and applications of laser-induced graphene (LIG) on polyimide (PI) films.
• To develop LIG-based stretchable strain sensors and electro-thermal actuators.
• To demonstrate the integrated sensing and actuation capabilities of LIG devices.

Main Methods:

• Systematic investigation of LIG conductive properties under varying fabrication conditions.
• Identification of laser fluence as the critical parameter for LIG formation.
• Fabrication of LIG-based strain sensors on polydimethylsiloxane (PDMS) substrates.
• Development and parameter analysis of LIG-based 3D electro-thermal actuators.
• Integration of a multimeter system for real-time resistance monitoring.

Main Results:

• Laser fluence was identified as the sole crucial parameter for optimizing LIG electrical performance.
• LIG-based strain sensors demonstrated over 50% tensile strain capability.
• A variety of LIG-based actuators were created, achieving pre-designed 3D architectures.
• The integrated system successfully monitored LIG resistance variations during 2D to 3D transformation.
• A wearable glove equipped with LIG sensors was demonstrated for soft robotic hand control.

Conclusions:

• LIG on PI films provides a scalable and cost-effective route to high-performance graphene materials.
• LIG-based devices exhibit significant potential for flexible and wearable electronics.
• The integrated sensing and actuation capabilities pave the way for advanced robotic and human-machine interfaces.