Piezoelectric sensor based on graphene-doped PVDF nanofibers for sign language translation

Abstract

The tracking of body motion, such as bending or twisting, plays an important role in modern sign language translation. Here, asubtle flexible self-powered piezoelectric sensor (PES) made of graphene (GR)-doped polyvinylidene fluoride (PVDF) nanofibersis reported. The PES exhibits a high sensitivity to pressing and bending, and there is a stable correlation between bending angle andpiezoelectric voltage. The sensitivity can be adjusted by changing the doping concentration of GR. Also, when the PES contacts asource of heat, a pyroelectric signal can be acquired. The positive correlation between temperature and signal can be used to avoidburns. The integrated sensing system based on multiple PESs can accurately recognize the action of each finger in real time, whichcan be effectively applied in sign language translation. PES-based motion-tracking applications have been effectively used, especiallyin human–computer interaction, such as gesture control, rehabilitation training, and auxiliary communication.