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

Yuan，Xiaoting1; Yan，Ao1; Lai，Ziwei2; Liu，Zhenghao3; Yu，Zhonghui1; Li，Zhanmiao1; Cao，Yan2; Dong，Shuxiang1,2

2022-07-01

10.1016/j.nanoen.2022.107340

Nano Energy   影响因子和分区

2211-2855

2211-3282

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)TiO (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-β 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 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 × 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.

Large poling-free piezoelectricity Mechanically directional stress field PVDF nanocomposite Self-powered sensor Strong electromechanical coupling

SCI ; EI

英语

其他

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000804424300002

ELSEVIER

20221912102253

3D printers ; Crystallography ; Electromechanical coupling ; Fluorine compounds ; Nanocrystals ; Piezoelectric devices ; Piezoelectricity ; Pressure sensors ; Stresses

Electricity: Basic Concepts and Phenomena:701.1 ; Printing Equipment:745.1.1 ; Nanotechnology:761 ; Solid State Physics:933 ; Crystalline Solids:933.1 ; Pressure Measuring Instruments:944.3

2-s2.0-85129704222

Scopus

1.School of Materials Science and Engineering,Peking University,Beijing,100871,China
2.Institute for Advanced Study,Shenzhen University,Shenzhen,518061,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China

Yuan，Xiaoting,Yan，Ao,Lai，Ziwei,et al. A poling-free PVDF nanocomposite via mechanically directional stress field for self-powered pressure sensor application[J]. Nano Energy,2022,98.

Yuan，Xiaoting.,Yan，Ao.,Lai，Ziwei.,Liu，Zhenghao.,Yu，Zhonghui.,...&Dong，Shuxiang.(2022).A poling-free PVDF nanocomposite via mechanically directional stress field for self-powered pressure sensor application.Nano Energy,98.

Yuan，Xiaoting,et al."A poling-free PVDF nanocomposite via mechanically directional stress field for self-powered pressure sensor application".Nano Energy 98(2022).