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Laser-Induced Graphene Strain Sensors for Body Movement Monitoring.
Aida M Barja1, Yu Kyoung Ryu1,2, Sandra Tarancón3
1Instituto de Sistemas Optoelectrónicos y Microtecnología, Universidad Politécnica de Madrid, Av. Complutense 30, Madrid 28040, Spain.
ACS Omega
|September 23, 2024
Summary
Researchers developed flexible, highly sensitive strain sensors using laser-induced graphene (LIG) encapsulated in polydimethylsiloxane (PDMS). These wearable sensors accurately monitor human body movement and structural health, demonstrating robust performance over many cycles.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Advancements in artificial intelligence of things require improved strain sensing mechanisms and interconnections.
- Laser-induced graphene (LIG) is a promising technique for creating wearable, lightweight, sensitive, and reliable strain sensors.
- Transferring LIG to elastomeric substrates enhances flexibility and stretchability.
Purpose of the Study:
- To manufacture and characterize polydimethylsiloxane (PDMS)-encapsulated LIG piezoresistive strain sensors.
- To evaluate the sensor's performance, including gauge factor, linearity, and durability.
- To demonstrate the sensor's application in human body movement and structural health monitoring.
Main Methods:
- Fabrication of LIG using direct laser writing.
- Encapsulation of LIG sensors in PDMS.
- Morphological characterization using Raman spectroscopy and scanning electron microscopy.
- Electromechanical characterization to assess sensor performance.
Main Results:
- Developed PDMS-encapsulated LIG strain sensors with quasi-linear behavior and a gauge factor of 111.
- Morphological analysis confirmed material integrity after testing and transfer.
- Increased LIG volume in contact with the substrate post-transfer and encapsulation improved sensor performance.
- Demonstrated accurate measurement of bend angles and robust performance (1500 cycles, 8% strain) for knee bending monitoring.
Conclusions:
- PDMS encapsulation enhances the performance and durability of LIG strain sensors.
- These sensors are suitable for diverse applications, including wearable human body monitoring and structural health monitoring.
- The developed sensors offer a reliable and sensitive solution for real-time strain detection.
