Fabrication And Research Of Self-Powered Intelligent Wearable Sensing Fiber

Triboelectric nanogenerator(TENG)is new type of nanoenergy technology that can harvest mechanical energy in surrounding and convert the energy into electricity,thus realizing the development of a new type of selfpowered wearable sensors,which generate electric signals directly upon mechanical stimuli.On another hand,good stretchability is also an essential character of the wearable sensors to guarantee deformation consistence with the human body.Meanwhile,good stretchability can also improve the Convenience and comfort during wearing.In this work,a fibrous stretchable triboelectric effect-based self-powered sensor with coaxial core-sheath structure is fabricated and applied in physiological monitoring.The output open-circuit voltage and shout-circuit current of sensor can reach nearly 10 V and 0.6 ?A,respectively.The elastic silicon rubber substrates(PDMS and Dragon Skin)and stretchable electrodes(carbon nanotubes and sliver nanowires)provide the sensing fiber with good resilience,and the output voltage of the sensing fiber keeps stable under 60%strain extension,demonstrating the stability of the sensor at large deformation and providing a solid foundation for application in human motion sensing.Meanwhile,the sensing fiber can detect ultralow pressure down to 0.02 N,showing its outstanding sensitivity and responsiveness to external force.Taking advantage of the excellent sensing performance of the sensing fiber,we applied it in the human motions monitoring,including large movements(joints bending,wrist bending and step)and subtle vital signs(pulse,phonation,and expression).Moreover,considering the stretchability and knittability,a tactile sensor array with 3×3 pixels is fabricated by weaving 6 FS-TENG sensors to form a two-dimensional structure and realize the pressure distribution recognition.