Preparation and Performance Optimization of ZnO Nanorod/PVDF-TrFE Composite Material and Its Application in Flexible Piezoelectric Sensors

The development of flexible wearable sensors in health monitoring has garnered significant attention, and piezo electric pressure sensing technology has emerged as a piv otal research direction. This study successfully fabricated a n ovel ZnO NRs/PVDF-TrFE nanocomposite material for construct ing high-performance piezoelectric nanogenerators (PENG). Zn O nanorods (ZnO NRs) were synthesized via high-temperature hydrothermal synthesis and integrated into the PVDF-TrFE poly mer matrix through electrospinning. The effects of ZnO content on the piezoelectric performance and β-phase crystallinity of th e composite were systematically investigated. Experimental res ults demonstrated that a 5 wt% ZnO content yielded optimal co mposite performance: achieving a β-phase content of 87.6% an d a significant voltage output increase to 12 V. The composite fi lm exhibited excellent mechanical stability, maintaining stable e lectrical output after 3000 consecutive compression cycles, pro ving its potential as a durable wearable device. Finally, when ap plied to monitor standing long jump movements in adolescents, the sensor demonstrated outstanding dynamic response capa bility and sensitivity, validating its practical value in real-time hu man motion monitoring.