All-in-One Leather-Based Flexible Capacitive Pressure Sensor for Human Monitoring and Wearable Comfort

Abstract

Flexible pressure sensors are capable of sensing external stimuli and converting them into electrical signals. However, most of the existing sensors are assembled with multi-layer structures, and the weak adhesion between layers renders the sensors prone to unstable operation or even failure under extreme conditions. Here, an all-in-one dielectric layer and electrode layer flexible capacitive pressure sensor (PLP) is reported, which was realized by exploiting the natural hierarchical structure of leather. The PLP not only achieves a high sensitivity (0.0076 kPa⁻¹, < 8.8 kPa) and fast response times (39/40 ms) simultaneously, but also has a superior cyclic stability (over 10000 times). The one-piece design ensures a tough interfacial bond between layers, giving the PLP excellent operational stability, verified by performing 10000 cycles of rubbing and bending, as well as by testing under various working environments. Additionally, the PLP exhibits remarkable wearable properties (mechanical properties, breathability, and water vapor permeability). The PLP can resist over 90% of Staphylococcus aureus (S. aureus) and Escherichia coli (E.coli), improve its surface temperature to 74.8 ℃ under a solar intensity of 1000 W m⁻², and attenuate electromagnetic waves with an effectiveness over 30 dB. The developed PLP sensor delivers stable sensing performance coupled with high-level human-body compatibility, which exhibits significant potential for next-generation wearable electronics.

Keywords

All-in-one / Flexible capacitive pressure sensor / Natural leather / High stability / Smart electronic device

References

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Funding

National Natural Science Foundation of China(22378250)

Sanqin Talents Special Support Plan Leading talents in scientific and technological innovation of Shaanxi Province

Key Project of Shaanxi Natural Science Basic Research Program (Special Support)(2023JC-XJ-12)

RIGHTS & PERMISSIONS

Donghua University, Shanghai, China