Flexible Piezoelectric Sensors Based on Ionic Liquid-doped Poly(L-Lactic Acid) for Human Coughing Recognition

He，Zifeng1; Liu，Yijie1; Babichuk，Ivan S.1,2; Zhou，Zisen1; Liu，Zhaohua1; Yang，Xiongbang1; Zhou，Ruiliang1; Pu，Yan1; Li，Shuhao1; Chang，Yu1; Ye，Terry Tao3; Gao，Zhaoli4,5; Yang，Jian1

2024-06-18

10.1002/admt.202400386

Advanced Materials Technologies   影响因子和分区

2365-709X

Cough is a common symptom of various respiratory diseases. However, recognizing a subject's cough using acoustic imaging can be challenging due to the complexity of coughing and the vulnerability of acoustic acquisition to external interference. This research aims to address these issues by utilizing a flexible piezoelectric ionic liquid-doped poly(L-lactic acid) (PLLA) sensor to gather the pressure signals from the human surface. 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIm]TFSI) ionic liquid (IL) can enhance the piezoelectric performance of PLLA thin film, the corresponding output voltage, and impact sensitivity are improved to three times and 105.1% for the PLLA/IL thin film with 1 wt% IL, 140 °C annealing 2 h and four times drawing ratio. The effect of IL on the crystallization behavior and piezoelectric properties of thin films during their preparation is investigated. The flexible PLLA/IL sensor is integrated into a wearable electronic system which collects and transmits piezoelectric signals from cough-induced vibrations to the filter for denoising, then the acquired cough data are decomposed using the Empirical Mode Decomposition method and trained in a multi-layer perception model to detect human coughing. It's evident that the flexible piezoelectric PLLA/IL sensors can be applied to human coughing recognition and show great potential applications in intelligent healthcare.

coughing recognition flexible sensors ionic liquid piezoelectric Poly(L-lactic acid) signal Processing

SCI ; EI

英语

其他

2-s2.0-85190152760

Scopus

1.School of Mechanical and Automation Engineering and Jiangmen Key Laboratory of Intelligent Manufacturing of Polymer Materials,Wuyi University,Jiangmen,529020,China
2.V.E. Lashkaryov Institute of Semiconductor Physics,NAS of Ukraine,Kyiv,03680,Ukraine
3.Department of Electrical and Electronic Engineering and University Key Laboratory of Advanced Wireless Communications of Guangdong Province,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Biomedical Engineering,The Chinese University of Hong Kong,Shatin, New Territories,999077,Hong Kong
5.CUHK Shenzhen Research Institute,Shenzhen,Nanshan,518060,China

He，Zifeng,Liu，Yijie,Babichuk，Ivan S.,et al. Flexible Piezoelectric Sensors Based on Ionic Liquid-doped Poly(L-Lactic Acid) for Human Coughing Recognition[J]. Advanced Materials Technologies,2024,9(12).

He，Zifeng.,Liu，Yijie.,Babichuk，Ivan S..,Zhou，Zisen.,Liu，Zhaohua.,...&Yang，Jian.(2024).Flexible Piezoelectric Sensors Based on Ionic Liquid-doped Poly(L-Lactic Acid) for Human Coughing Recognition.Advanced Materials Technologies,9(12).

He，Zifeng,et al."Flexible Piezoelectric Sensors Based on Ionic Liquid-doped Poly(L-Lactic Acid) for Human Coughing Recognition".Advanced Materials Technologies 9.12(2024).