Matrix Swelling-Induced Precracking in Graphene Woven Fabric for Ultrasensitive Strain Sensors

Ying Wu ¹, Yaru Guo ¹, Wenxing Li ¹

⁰Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

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February 3, 2025

View abstract on PubMed

Summary

Researchers developed a novel precracked strain sensor using solvent-swollen graphene woven fabric/polydimethylsiloxane (sGWF/PDMS) composites. This material achieves ultrahigh gauge factors (GFs) for highly sensitive detection of minor deformations in wearable electronics and environmental monitoring.

Area Of Science

Materials Science
Nanotechnology
Sensor Technology

Background

Growing demand for sensitive flexible strain sensors in wearable electronics, healthcare, and environmental monitoring.
Need for materials with high precision in detecting subtle deformations.

Purpose Of The Study

Introduce a precracked strain sensor based on solvent-swollen graphene woven fabric/polydimethylsiloxane (sGWF/PDMS) composites.
Achieve ultrahigh gauge factors (GFs) and enhanced responsiveness to minor deformations.

Main Methods

Utilized PDMS swelling to induce microcracks in the graphene structure.
Conducted systematic in situ SEM analyses to observe microcrack expansion under strain.
Fabricated sGWF/PDMS composites for strain sensing applications.

Main Results

sGWF/PDMS composites exhibited substantially improved sensitivity compared to traditional graphene sensors.
Preexisting microcracks readily expanded under minor strain, causing rapid resistance changes.
Achieved ultrahigh GFs up to 82,378 at 2.8% stretching strain.

Conclusions

Matrix-swollen composites are a promising platform for high-sensitivity, low-strain detection.
Demonstrated excellent performance in human motion detection (pulses, blinks, speech) and environmental sensing (water ripples).
Offers potential for advancements in wearable electronics, environmental monitoring, and precision sensing.