Highly Transparent and Flexible All-Nanofiber-Based Piezocomposite Containing BaTiO3-Embedded P(VDF-TrFE) Nanofibers for Harvesting and Monitoring Human Kinetic Movements

초록

We developed kinetic energy-harvestable and kinetic movement-detectable piezoelectric nanogenerators (PENGs) consisting of piezoelectric nanofiber (NF) mats and metal-electroplated microfiber (MF) electrodes using electrospinning and electroplating methods. Percolative non-woven structure and high flexibility of the NF mats and MF electrodes allowed us to achieve highly transparent and flexible piezocomposites. A viscoelastic solution mixed with P(VDF-TrFE) and BaTiO3 was electrospun into piezoelectric NFs with a piezoelectric coefficient d33 of 21.2 pC/N. In addition the combination of electrospinning and electroplating techniques enabled the fabrication of Ni-plated MF-based transparent conductive electrodes (TCEs) contributing to the high transparency of the resulting piezocomposite. The energy-harvesting efficiencies of the BaTiO3-embedded NF-based PENGs with transmittances of 86% and 80% were 200 and 240 V/MPa respectively marking the highest values in their class. Moreover the output voltage driven by the coupling effect of piezoelectricity and triboelectricity during finger tapping was 25.7 V. These highly efficient energy-harvesting performances along with the transparent and flexible features of the PENGs hold great promise for body-attachable energy-harvesting and sensing devices as demonstrated in this study. Graphical Abstract: (Figure presented.) © Donghua University Shanghai China 2024.

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