Enhanced PVDF electrospun nanofiber capacitive pressure sensor for wearable electronic

Abstract

Two different types of nanofibers were prepared by electrospinning, namely poly-(vinylidene fluoride) PVDF and PVDF/TiO2. The prepared nanofibers have piezoelectric properties, which are characterized by the content of ß-phase. Another way to improve the piezoelectric properties is to use TiO2 nanoparticles, which increases the piezoelectric effect. Piezoelectric effect is strongly connected with capacitive properties which was investigated in this work. Capacitive sensor with a sandwich structure consisting of EVA foam as a cover, conductive copper fabric and nanofibers was prepared. The sensor is light-weight, flexible with the possibility of using for wearable electronics. We can therefore determine the maximum pressure at individual points of the foot, the course of its values, the method of pressure distribution throughout the foot. We can find use not only in research on walking, running and postures, but also, provide information on the magnitude of the applied force over time. The force converted to the selected sensor area is then pressure information.