新型海绵状多孔压电高分子薄膜的设计、制备及其在柔性纳米发电机中的应用研究

压电高分子材料能够用于组装柔性的压电纳米发电机，在自驱动器件系统中具有十分重要的应用前景，但其电输出性能低是制约其应用的主要瓶颈。本项目针对压电高分子材料的电输出性能较低的问题，拟通过在聚偏氟乙烯等压电高分子薄膜中引入纳米多孔结构，改善材料的力学性质，从而提高其电输出性能。拟采用浇注-酸刻蚀的方法制备具有海绵状纳米多孔结构的大面积压电高分子薄膜；系统研究并阐明多孔结构对薄膜的力学性质以及电输出性能的影响规律与调控机制。基于所制备的多孔压电高分子薄膜组装柔性的压电纳米发电机，将其与电子器件进行一体化结合，实现电子器件的自驱动，为发展一体化的自驱动器件系统提供重要的理论与实验依据。

Piezoelectric polymer materials can be used to assemble flexible piezoelectric nanogenerators, and hold great potentials in application of self-powered electronic systems. However, its low electric output is the main obstacle for the application. This project aims at the problems of low electric output of piezoelectric polymer materials. It is proposed to introduce nanopores into polyvinylidene fluoride (PVDF) and other piezoelectric polymer thin films. The nanoporous structure is used to improve the mechanical property of piezoelectric polymer thin films and thus enhance their piezoelectric output performance. A casting-acid etching method will be used to fabricate sponge-like nanoporous piezoelectric polymer thin films with large area. The effects of the nanoporous structure on the mechanical property and piezoelectric output performance of thin films will be systematically studied and elucidated. The prepared nanoporous piezoelectric polymer thin film will be used to assemble flexible piezoelectric nanogenerator, which will be integrated onto an electronic device for operating the device. This research will provide valuable theoretical and experimental evidence for developing integrated self-powered electronic systems.