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Self-Sensing Soft Skin Based on Piezoelectric Nanofibers
Giacomo Selleri1, Francesco Mongioì2, Emanuele Maccaferri3
1Department of Electrical, Electronic, and Information Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy.
Polymers
|January 21, 2023
Summary
This study developed a flexible, self-powered tactile sensor using poly(vinylidenefluoride-trifluoroethylene) (PVDF-TrFE) nanofibers. The e-skin sensor demonstrates high sensitivity and durability for wearable applications and health monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Wearable devices and electronic skins are advancing for biomedical and robotic applications.
- Piezoelectric polymer sensors, particularly poly(vinylidenefluoride-trifluoroethylene) (PVDF-TrFE) nanofibers, offer self-powering, flexibility, and light weight.
Purpose of the Study:
- To develop a flexible, self-powered tactile sensor using PVDF-TrFE nanofibers for wearable applications.
- To enhance piezoelectric performance for e-skin and health monitoring devices.
- To validate the sensor's performance and durability.
Main Methods:
- Fabrication of a flexible sensor using PVDF-TrFE nanofibers.
- Integration of carbon black (CB)-based electrodes in a sandwich structure.
- Electromechanical characterization in the 0.25 Hz–20 Hz frequency range.
- Fatigue testing under 1 kN compressive force for 10^6 cycles.
Main Results:
- The sensor achieved a sensitivity of up to 4 mV/N, suitable for human activities.
- Signal acquisition circuit parameters were optimized for the required frequency range.
- An electrical model of the nanofibrous piezoelectric sensor was validated experimentally.
- The sensor maintained over 77.5% of its initial sensitivity after extensive fatigue testing.
Conclusions:
- PVDF-TrFE nanofibers enable high-performance flexible piezoelectric sensors for e-skin and wearable technology.
- The developed sensor exhibits excellent sensitivity, durability, and self-powering capabilities.
- This technology holds promise for advanced biomedical monitoring and human-robot interaction.
