A poling-free PVDF nanocomposite via mechanically directional stress field for self-powered pressure sensor application

It is well known that Poly(vinylidene fluoride) (PVDF) polymer and its composites exhibit limited piezoelectricity only after strong electric field poling (SEFP) to align randomly oriented molecular dipoles inside. Here, we report that a (Pb, Zr)TiO3 (PZT) particles doped PVDF-polymer nanocomposite shows a large poling-free piezoelectric (PFP) coefficient and strong electromechanical coupling after experiencing mechanically directional stress field (MDSF). Analyses based on WAXD, FTIR, and HRTEM reveal that the MDSF actives and then induces a crystal phase transformation (CPT) from disordered star-shape nanocrystals to ordered, self-poled chain-shape high-beta nanocrystalline fibers. PFM scanning images further show the existence of well-defined polarization. Furthermore, a 7-layer series-connected, self-powered circular pressure sensor was fabricated using multi-material 3D printing technology, which exhibits a high sensitivity of 235 mV/kPa and a high-power density of 0.9 mW/cm(2) under a dynamic pressure of 255 kPa, and it is near 8 times higher than that of a conventional, poled single-layer PVDF sensor. Finally, a (3 x 3) real-time lighting tactile sensor array is 3D printed, confirming its feasibility for practical application. The MDSF-induced CPT and large PFP effect are significant because it may open a way to fabricate piezopolymer integrated devices without SEFP.

Automated summary

This study reports a PVDF-polymer nanocomposite doped with (Pb, Zr)TiO3 (PZT) particles, which exhibits a large poling-free piezoelectric (PFP) effect after experiencing mechanically directional stress field (MDSF). The MDSF activates a crystal phase transformation from disordered star-shape nanocrystals to ordered, self-poled chain-shape nanocrystalline fibers, confirming the existence of polarization. Furthermore, a 3D-printed pressure sensor demonstrates high sensitivity and power density.