Ultrahigh Piezoelectric Coefficients Achieved by Tailoring the Sequence and Nano‐Domain Structure of P(VDF‐TrFE)

• DOI: 10.1002/adma.202502708
• Publication Date: 2025-05-27T12:49:03Z
• Authors: Ba Qin; Guo‐Tong Ding; Xiao‐Yu Yang; Wen‐Xuan Li; Yi‐Jin He; An‐Yi Ren; Wan‐Li Xing; Shao‐Bo Tan; Xiao‐Yong Wei; Zhi‐Cheng Zhang
• Keywords: Phase boundary; Ferroelectric Polymers

During past decades, the construction of morphotropic phase boundary (MPB) behavior in ceramic-based relaxor ferroelectrics has successfully led to a significant enhancement piezoelectric coefficient for actuators, transducers, and sensors application. However, MPB-like is achieved only ferroelectric state flexible polymers such as poly(vinylidene fluoride-trifluoroethylene) with highest coefficients ≈-63.5 pC/N, due lack rational design polymer chain structure composition. Here, study reports first observed synthesized by fully hydrogenating fluoride-chlorotrifluoroethylene), which are primarily linked head-to-head/tail-to-tail manner, trifluoroethylene units randomly dispersed along molecular chain. The unique found be responsible formation conformations disorder, thus strong behavior, transition from an all-trans conformation 3/1 helix, inducing behavior. As result, outstanding longitudinal -107 more than five times higher that commercial fluoride) (-20 pC/N), observed. This work opens up new gate next-generation high-performance devices.