Research on PVDF-based Pressure Sensing Materials for E-skin Systems

With the fast growth of wearable and portable devices, flexible piezoelectric sensors with long life, small size and light weight have become the focus of attention. Polyvinylidene fluoride-based composites are regarded as promising materials, but they also have drawbacks such as poor electrical properties and low piezoelectric constants. In this article, methods to improve the piezoelectric properties of PVDF films are investigated, and its results show that doping graphene oxide, barium titanate and other materials in PVDF films can effectively improve beta-phase crystallinity of PVDF. And this approach improves its piezoelectric properties. On the other hand, the percentage of β-phase in the structure of the PVDF film can be effectively improved and the effective strain, by changing the molding environment of the PVDF films. This will be of great significance for the future development of medical devices, the automotive industry and aerospace.