Flash annealing boosts piezoelectricity of PVDF-TrFE

作者：Yue Hu, Chunyan Tang, S. Li, Yujie Wu, Kai Ke, Ran Chen, Chuanfu Luo, Quanxiao Dong, Hongxiang Li, Lu Bai, Kai Zhang, Yu Wang, Zheng‐Ying Liu, Ming‐Bo Yang, Wei Yang · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-67292-5 · 被引用次数：9 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Dielectric materials and actuators、Advanced Materials and Mechanics

Annealing increases β-phase crystal contents of poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE), thus improving its ferroelectricity and piezoelectricity. However, most studies focus on improving piezoelectricity of wet-processed PVDF-TrFE via long-time annealing. Here, we report a flash annealing strategy to boost piezoelectricity of PVDF-TrFE at a temperature above its Curie temperature, which has never been reported for polymer processing. Specifically, electrospun PVDF-TrFE fiber mats show a piezoelectric coefficient d33 of −70.89 pm/V or −68 pC/N after flash annealing, which are superior to that of the mats annealed for 2 h. Besides, the mechanisms for an improvement of β-phase crystal content during flash annealing was interpreted by in-situ Raman spectroscopy, XRD, Fourier transform infrared spectroscopy, and molecular dynamics simulation. The as-fabricated piezoelectric films show promising applications in energy harvesting, high-frequency vibration. It unveils an intriguing way to significantly boost intrinsic piezoelectricity of PVDF-TrFE toward developing advanced flexible electronics and micro-electro-mechanical systems. Poly(vinylidene fluoride-co-trifluoroethylene)’s (PVDF-TrFE) piezoelectricity can be enhanced by annealing, however current annealing methods are slow. Here, the authors perform ultra-fast flash annealing of PVDF-TrFE to achieve a high piezoelectricity.