Huang Zhao-Xia, Li Lan-Wei, Huang Yun-Zhi, Rao Wen-Xu, Jiang Hao-Wei, Wang Jin, Zhang Huan-Huan, He He-Zhi, Qu Jin-Ping
National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, Department of Mechanical and Automotive Engineering, South China University of Technology, 510641, Guangzhou, China.
Nat Commun. 2024 Jan 27;15(1):819. doi: 10.1038/s41467-024-45184-4.
Lightweight flexible piezoelectric polymers are demanded for various applications. However, the low instinctively piezoelectric coefficient (i.e. d33) and complex poling process greatly resist their applications. Herein, we show that introducing dynamic pressure during fabrication is capable for poling polyvinylidene difluoride/barium titanate (PVDF/BTO) composites with d33 of ~51.20 pC/N at low density of ~0.64 g/cm. The melt-state dynamic pressure driven energy implantation induces structure evolutions of both PVDF and BTO are demonstrated as reasons for self-poling. Then, the porous material is employed as pressure sensor with a high output of ~20.0 V and sensitivity of ~132.87 mV/kPa. Besides, the energy harvesting experiment suggests power density of ~58.7 mW/m can be achieved for 10 N pressure with a long-term durability. In summary, we not only provide a high performance lightweight, flexible piezoelectric polymer composite towards sustainable self-powered sensing and energy harvesting, but also pave an avenue for electrical-free fabrication of piezoelectric polymers.
各种应用都需要轻质柔性压电聚合物。然而，其固有的低压电系数（即d33）和复杂的极化过程极大地阻碍了它们的应用。在此，我们表明在制造过程中引入动态压力能够在约0.64 g/cm的低密度下对聚偏二氟乙烯/钛酸钡（PVDF/BTO）复合材料进行极化，其d33约为51.20 pC/N。熔体状态下动态压力驱动的能量注入引起PVDF和BTO的结构演变被证明是自极化的原因。然后，该多孔材料被用作压力传感器，具有约20.0 V的高输出和约132.87 mV/kPa的灵敏度。此外，能量收集实验表明，在10 N压力下，长期耐久性可达约58.7 mW/m的功率密度。总之，我们不仅提供了一种高性能的轻质、柔性压电聚合物复合材料，用于可持续的自供电传感和能量收集，而且为无电制造压电聚合物铺平了道路。
