Li Mengyu, Han Xin, Zhang Chuanlin, Zhang Yu, Guo Dan, Xie Guoxin
State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China.
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
ACS Appl Mater Interfaces. 2024 Jan 24;16(3):3786-3794. doi: 10.1021/acsami.3c15881. Epub 2024 Jan 12.
Organic piezoelectric nanogenerators (PENGs) show promise for monitoring damage in mechanical equipment. However, weak interfacial bonding between the reinforcing phase and the fluorinated material limits the feedback signal from the damaged area. In this study, we developed a PENG film capable of real-time identification of the damage location and extent. By incorporating core-shell barium titanate (BTO@PVDF-HFP) nanoparticles, we achieved enhanced piezoelectric characteristics, flexibility, and processability. The composite film exhibited an expanded output voltage range, reaching 41.8 V with an increase in frequency, load, and damage depth. Additionally, the film demonstrated self-powered electroluminescence (EL) during the wear process, thanks to its inherent ferroelectric properties and the presence of luminescent ZnS:Cu particles. Unlike conventional PENG electroluminescent devices, the PENG film exhibited luminescence at the damage location over a wide temperature range. Our findings offer a novel approach for realizing modular and miniaturized real-time damage mapping systems in the field of safety engineering.
有机压电纳米发电机（PENGs）在监测机械设备损伤方面展现出应用前景。然而，增强相和氟化材料之间的弱界面结合限制了受损区域的反馈信号。在本研究中，我们开发了一种能够实时识别损伤位置和程度的PENG薄膜。通过掺入核壳结构的钛酸钡（BTO@PVDF-HFP）纳米颗粒，我们实现了增强的压电特性、柔韧性和可加工性。复合薄膜展现出更宽的输出电压范围，随着频率、负载和损伤深度的增加，输出电压可达41.8 V。此外，由于其固有的铁电特性以及发光ZnS:Cu颗粒的存在，该薄膜在磨损过程中表现出自供电电致发光（EL）现象。与传统的PENG电致发光器件不同，PENG薄膜在较宽的温度范围内在损伤位置处发光。我们的研究结果为安全工程领域实现模块化和小型化实时损伤映射系统提供了一种新方法。
