Fecha de publicación: -- Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE Hybrid BTO-TiO2 nanofillers integrated into electrospun PVDF fibers significantly enhance β-phase formation and piezoelectric performance. The resulting nanocomposite fibers and twisted yarns generate high voltage and power output under mechanical stimulation. This work demonstrates an efficient strategy for improving piezoelectric energy generation through hybrid filler engineering and scalable fiber-to-yarn fabrication.

ABSTRACT
In this study, we assess the piezoelectric performance of poly(vinylidene fluoride) (PVDF) nanocomposite fibers incorporating a hybrid Barium titanate-Titanium dioxide (BTO-TiO2) filler. The 1 wt% PVDF/BTO-TiO2 electrospun fiber mat yields a maximum peak-to-peak output voltage (Vpp) of 5.47 V and a current of 1.823 μA under tapping, resulting in a maximum instantaneous output power density of 2.49 μWcm−2 at 3 MΩ load. A pressing mode using two fingers generates a smaller voltage of 0.36 V. Furthermore, manually twisted piezoelectric nanogenerator yarns (PENGYs) were fabricated from electrospun fibers to evaluate their energy generation. The 1% PVDF/BTO-TiO2 PENGY exhibits Vpp of 2.5 V and a current of 0.833 μA under finger tapping, with an output power density of 0.221 μW cm−2. This work demonstrates a novel low-energy method to create functional piezoelectric yarns using hybrid BTO-TiO2 nanofillers, highlighting the potential of the developed yarn architecture for future investigation in textile-integrated energy-harvesting systems.