Highly Transparent and Adhesive Poly(vinylidene difluoride) Films for Self-Powered Piezoelectric Touch Sensors

Qing-Qing Li; Guang-Kuo Wang; Zi-Xu Liang; Zhi-Jun Hu

doi:10.1007/s10118-022-2720-6

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Highly Transparent and Adhesive Poly(vinylidene difluoride) Films for Self-Powered Piezoelectric Touch Sensors

RESEARCH ARTICLE | Updated：2022-06-22

- Highly Transparent and Adhesive Poly(vinylidene difluoride) Films for Self-Powered Piezoelectric Touch Sensors
- Chinese Journal of Polymer Science Vol. 40, Issue 7, Pages: 726-737(2022)
- Affiliations：
  
  a.School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
  b.Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China
  c.Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
- Author bio：
  
  zhijun.hu@suda.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2720-6
  CLC：
- Received：01 December 2021，
  
  Revised：2022-2-16，
  
  Accepted：17 February 2022，
  
  Online First：20 May 2022，
  
  Published：01 July 2022
- Accepted：
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Li, Q. Q.; Wang, G. K.; Liang, Z. X.; Hu, Z. J. Highly transparent and adhesive poly(vinylidene difluoride) films for self-powered piezoelectric touch sensors. Chinese J. Polym. Sci. 2022, 40, 726–737

Qing-Qing Li, Guang-Kuo Wang, Zi-Xu Liang, et al. Highly Transparent and Adhesive Poly(vinylidene difluoride) Films for Self-Powered Piezoelectric Touch Sensors[J]. Chinese Journal of Polymer Science, 2022, 40(7): 726-737.
Li, Q. Q.; Wang, G. K.; Liang, Z. X.; Hu, Z. J. Highly transparent and adhesive poly(vinylidene difluoride) films for self-powered piezoelectric touch sensors. Chinese J. Polym. Sci. 2022, 40, 726–737 DOI： 10.1007/s10118-022-2720-6.

Qing-Qing Li, Guang-Kuo Wang, Zi-Xu Liang, et al. Highly Transparent and Adhesive Poly(vinylidene difluoride) Films for Self-Powered Piezoelectric Touch Sensors[J]. Chinese Journal of Polymer Science, 2022, 40(7): 726-737. DOI： 10.1007/s10118-022-2720-6.

摘要

Transparent PVDF-based piezoelectric films with good adhesion and high output performance were fabricated by a large-scale and low-cost method. Transparent piezoelectric sensors exhibit excellent piezoelectric sensing and energy harvesting performance for piezoelectric touchscreens and wearable devices.

Abstract

With the rapid development of internet of things

self-powered touch sensors made of piezoelectric fluorinated polymers have attracted significant interest because they can constantly convert mechanical energy into electrical energy without external power supply. However

it is still challenging to fabricate fluorinated polymer films with good adhesion and high output performance with a large-scale and low-cost method while maintaining high transparency

which are extremely important for simultaneous optical detection and electromechanical transduction. In this work

we demonstrate that the incorporation of a molecular ferroelectric-dabcoHReO

(DH) into poly(vinylidene difluoride) (PVDF) solution enables high-throughput and low-temperature processing of flexible and transparent piezoelectric films by scalable processing method. The effects of multiaxial DH are multiple. First

DH can trigger the phase transition of PVDF from

- to

-phase and realize the orderly orientation of PVDF

which guarantees higher piezoelectric performance without any additional electrical poling process. Second

the hydrophilic nature of DH can improve the adhesion properties of PVDF

which in turn improve the stability and durability of the devices. By optimizing the fabrication processes

the transmittance of the piezoelectric touch sensors based on PVDF films and Ag nanowires coated poly(ethylene terephthalate) electrodes can be higher than 94%. The piezoelectric voltage constant

of the transparent films can reach to 1.2 V·m·N

−1

which is at least three times higher than the commercially available PVDF films obtained by stretching. These results indicate that the flexible piezoelectric sensors have potential applications in transparent electronic devices for mechanical sensing and energy harvesting.

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