posted on 2024-10-19, 13:06authored byJunlong Huang, Guangzhong Xie, Xiangdong Xu, Zhenya Geng, Yuanjie Su
Integration
of multiple superior features into a single flexible
pressure sensor would result in devices with greater versatility and
utility. To apply the device to a variety of scenarios and solve the
problem of accumulation of e-waste in the environment, it is highly
desirable to combine degradability and wide-range linearity characteristics
in a single device. Herein, we reported a degradable multilayer fabric
(DMF) consisting of an ellipsoidal carbon nanotube (ECNT) and polyvinylpyrrolidone/cellulose
acetate electrospun fibers (PEF). The alternative layer-by-layer stacking
of the ECNT and PEF notably accelerates the sensitivity toward pressure.
The optimized device demonstrated a sensitivity of 3.38 kPa–1 over a wide measurement range from 0.1 to 500 kPa, as well as great
mechanical stability over 2000 cycles. A good degradation performance
was confirmed by both Fourier transform infrared (FTIR) characterization
and decomposition experiments in sodium hydroxide solution. The fabricated
sensor is capable of precepting a variety of physiological scenarios
including subtle arterial pulse, dancing training, walking postures,
and accidental falls. This work throws light onto the fundamental
understanding of the mechanical interfacial coupling in piezoresistive
materials and provides possibilities for the design and development
of on-demand wearable electronics.