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Ultrafast Piezoresistive Pulse Sensors Based on Laser-Induced Graphene on PCL-b-PDMS-b-PCL Crosslinked Polymers
Teodora Vićentić1, Marija V Pergal2, Vanja Vojnović3
1Center for Microelectronic Technologies, Institute of Chemistry Technology and Metallurgy, Njegoševa 12, Belgrade, 11001, Serbia.
Nanotechnology
|April 28, 2026
Summary
New flexible piezoresistive pulse sensors use laser-induced graphene (LIG) and tunable polyurethanes (PUs) for advanced wearable health monitoring. These biocompatible sensors offer high performance and durability for continuous physiological parameter tracking.
Area of Science:
- Materials Science
- Biomedical Engineering
- Polymer Chemistry
Background:
- Growing demand for high-performance sensors in biomedical applications.
- Existing materials lack environmental compatibility, flexibility, or durability for continuous monitoring.
- Need for advanced materials for wearable physiological sensors.
Purpose of the Study:
- To develop flexible piezoresistive pulse sensors with enhanced biocompatibility and tunable properties.
- To integrate laser-induced graphene (LIG) with novel polyurethane (PU) networks for pulse sensing.
- To establish design rules for next-generation wearable health monitors.
Main Methods:
- Fabrication of porous LIG patterns on polyimide.
- Transfer of LIG onto PU films with varying soft-segment content (40-70 wt.%).
- Comprehensive physicochemical characterization and device performance testing.
Main Results:
- 40 wt.% soft-segment PU substrates showed optimal flexibility and mechanical stability.
- Sensors achieved high signal-to-noise ratios (27.5-51.8 dB) and fast response times (24 ms).
- Demonstrated consistent performance over multiple use cycles with low hysteresis error.
Conclusions:
- Tunable synthetic PUs serve as effective LIG substrates for flexible sensors.
- Polymer composition and integration methods directly impact device performance.
- This research provides a foundation for developing advanced wearable health monitoring devices.
