The team led by Professor Xu Minglong from Xi'an Jiaotong University has proposed a design and development method for ultra-high equivalent piezoelectric effect films based on flexible electret materials.They fabricated a sandwich-type composite film, whose equivalent piezoelectric coefficient reaches 1.5×10⁴pC/N, over 700 times that of commercial PVDF materials. With good mechanical stability and high-temperature adaptability, it can be used for large deformation measurement, etc. The achievement was published in Science Advances.

Paper Link:https://www.science.org/doi/10.1126/sciadv.adt4003

Fig.1 Design Concept and Fabrication Process of Flexible Electret and Its Ultrahigh Equivalent Piezoelectric Effect

Fig.2 Regulation Process of Equivalent Piezoelectric Coefficient and Environmental Adaptability Research

Fig.3 Application Examples and Demonstration