Abstract
With increasing demand for wearable electronics, highly sensitive and flexible piezoresistive sensors (PRS) have received increasing attention. As an important component, structural materials with high compressibility and electrical conductivity are a powerful impetus for the development of PRS. Since the structural deformation occurred during high-temperature carbonization makes many three-dimensional porous structures made from low-cost biomass unsuitable for fabricating flexible PRS, we propose a convenient carbonization-free route to prepare PRS devices based on natural plant fibers. By developing and using a water-based conductive ink, the surface modification and assembly of plant fibers can be integrated into a one-pot foaming process to generate ink-modified plant fiber sponges (m-PFS). Benefiting from favorable mechanical property and sensitivity (133.3 kPa−1 in a pressure range of 10 ~ 750 Pa), the polydimethylsiloxane packaged m-PFS is demonstrated as a high-performance flexible PRS for detecting human physiological signals. This study provides new opportunities for the application of biomass in wearable electronics and human health monitoring.
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