Xu Tianpei, Jin Long, Ao Yong, Zhang Jieling, Sun Yue, Wang Shenglong, Qu Yuanxiao, Huang Longchao, Yang Tao, Deng Weili, Yang Weiqing
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
Research Institute of Frontier Science, Southwest Jiaotong University, Chengdu, 610031, China.
Nat Commun. 2024 Dec 30;15(1):10876. doi: 10.1038/s41467-024-55177-y.
Piezoelectric electronics possess great potential in flexible sensing and energy harvesting applications. However, they suffer from low electromechanical performance in all-organic piezoelectric systems due to the disordered and weakly-polarized interfaces. Here, we demonstrated an all-polymer piezo-ionic-electric electronics with PVDF/Nafion/PVDF (polyvinylidene difluoride) sandwich structure and regularized ion-electron interfaces. The piezoelectric effect and piezoionic effect mutually couple based on such ion-electron interfaces, endowing this electronics with the unique piezo-ionic-electric working mechanism. Further, owing to the massive interfacial accumulation of ion and electron charges, the electronics obtains a remarkable force-electric coupling enhancement. Experiments show that the electronics presents a high d of ~80.70 pC N, a pressure sensitivity of 51.50 mV kPa and a maximum peak power of 34.66 mW m. It is applicable to be a transducer to light LEDs, and a sensor to detect weak physiological signals or mechanical vibration. This work shows the piezo-ionic-electric electronics as a paradigm of highly-optimized all-polymer piezo-generators.
压电电子学在柔性传感和能量收集应用中具有巨大潜力。然而，由于界面无序和极化较弱，全有机压电系统的机电性能较低。在此，我们展示了一种具有聚偏氟乙烯/全氟磺酸离子交换膜/聚偏氟乙烯（PVDF）三明治结构和规整化离子-电子界面的全聚合物压电热电电子学。基于这种离子-电子界面，压电效应和压电热电效应相互耦合，赋予该电子学独特的压电热电工作机制。此外，由于离子和电子电荷在界面大量积累，该电子学实现了显著的力电耦合增强。实验表明，该电子学的d值高达约80.70 pC/N，压力灵敏度为51.50 mV/kPa，最大峰值功率为34.66 mW/m²。它适用于作为点亮发光二极管的换能器，以及检测微弱生理信号或机械振动的传感器。这项工作展示了压电热电电子学作为高度优化的全聚合物压电发电机的范例。
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