High-performance Piezoelectric Nanogenerator of Bto-Pvdf Nanofibers for Wearable Sensing.

Piezoelectric nanogenerator (PENG) produces stable electrical signals in response to external mechanical stimuli and holds promise in the fields of flexible sensors and smart wearable devices. In practice, a high-performance PENG with a straightforward structure and exceptional reliability is deeply desired. In this study, we optimally synthesized piezoelectric composites comprising polyvinylidene fluoride (PVDF) incorporated with BaTiO 3 (BTO) nanoparticles (NPs) and fabricated a piezoelectric nanogenerator with heightened sensitivity by using the electrospinning technique. The polar β-phase content of the dual-optimized BTO-PVDF electrospun fiber reaches up to 82.39%. The optimized BTO-PVDF PENG (BP-PENG) demonstrates outstanding performances and excellent hydrophobic properties. In the bending mode, it achieves a remarkable maximum open-circuit voltage of 19.152 V, a transferred charge of 8.058 nC, and an output voltage per unit area of 2.128 V/cm 2 . Under vertical pressure conditions, the BP-PENG exhibits an impressive voltage of 12.361 V while the force is 2.156 N, demonstrating a notable pressure sensing sensitivity of 5.159 V/kPa, with an excellent linear relationship. Furthermore, the BP-PENG displays sensitive sensing features in monitoring hand movements. It generates highly discriminating voltage signals for different hand movements and the output voltage reaches up to 10 V while the wrist is bent up. The sensitive response and high performance make it promising for applications in human motion monitoring and smart wearable devices. This article is protected by copyright. All rights reserved.