3D interlock design 100% PVDF piezoelectric to improve energy harvesting

Abstract

Piezoelectric textile structures based on 100% poly(vinylidene fluoride) (PVDF) were developed and characterised. Multifilaments of 246 tex were produced by melt spinning. The mechanical stretching during the process provides PVDF fibres with a piezoelectric β-phase of up to 97% has been measured by FTIR experiments. Several studies have been carried out on piezoelectric PVDF-based flexible structures (films or textiles), the aim of the study being the investigation of the differences between 2D and 3D woven fabrics from 100% optimised (by optimising piezoelectric crystalline phase) piezoelectric PVDF multifilament yarns. The textile structures were poled after the weaving process, and a maximum output voltage of 2.3 V was observed on 3D woven under compression by DMA tests. Energy harvesting is optimised in a 3D interlock thanks to the stresses of the multifilaments in the thickness. The addition of a resistor makes it possible to measure energy of 10.5 μJ.m−2 during 10 cycles of stress in compression of 5 s each.

Fiber/Fabric‐Based Piezoelectric and Triboelectric Nanogenerators for Flexible/Stretchable and Wearable Electronics and Artificial Intelligence

“…3D fabric structures with more piezoelectric components incorporated are desirable for high‐performance fabric‐based PENGs. As displayed in Figure g, a 3D interlock woven fabric‐based PENG was developed based on 100% melt‐spun piezoelectric PVDF fibers . By comparing the electrical outputs of a 2D plain woven PENG, it was found that the energy harvesting ability of the 3D interlock woven structure was greatly improved.…”

“…g) A 3D diagonal interlock woven structure PENG developed by fabricating PVDF fibers and conductive fibers. Reproduced with permission . Copyright 2018, IOP Publishing.…”

Hybrid lead-free polymer-based nanocomposites with improved piezoelectric response for biomedical energy-harvesting applications: A review

“…Contact-mode poling with an electric field and heating is illustrated schematically in Figure S2. The applied external electric field strength required to achieve permanent polarization of PVDF has been reported to be 100 MV/m [144], 300 MV/m [145], 220 MV/m [146], 2.7±0.1 MV·m -1 [35], and 20 V·μm -1 [147]. The poling conditions were as follows: 50 kV cm −1 was applied at 100 °C to PVDF-TrFE containing BTO and rGO [33].…”

“…Both of these effects were conducive to the improvement of the piezoelectric effect and energy harvesting performance in PVDF-based PENG. The mechanical stretching during processing provided PVDF fibres with a piezoelectric β-phase content of up to 97%, as determined using FTIR spectroscopy [35].…”

“…PVDF scaffolds were also prepared by melt spinning [35], and from PVDF/clay components (modified or unmodified clay with an organic modifier) containing up to 5 wt% of an additive [36]. Stretchable PVDF piezoelectric generators that exhibited excellent responses under extremely large applied strains (more than 100%), were prepared by electrohydrodynamic directwriting using a mechano-electrospinning process [37].…”