nn1c01606_si_001.mp4 (14.12 MB)
Download fileHierarchically Microstructure-Bioinspired Flexible Piezoresistive Bioelectronics
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posted on 2021-06-15, 15:45 authored by Tao Yang, Weili Deng, Xiang Chu, Xiao Wang, Yeting Hu, Xi Fan, Jia Song, Yuyu Gao, Binbin Zhang, Guo Tian, Da Xiong, Shen Zhong, Lihua Tang, Yonghe Hu, Weiqing YangThe
naturally microstructure-bioinspired piezoresistive sensor
for human–machine interaction and human health monitoring represents
an attractive opportunity for wearable bioelectronics. However, due
to the trade-off between sensitivity and linear detection range, obtaining
piezoresistive sensors with both a wide pressure monitoring range
and a high sensitivity is still a great challenge. Herein, we design
a hierarchically microstructure-bioinspired flexible piezoresistive
sensor consisting of a hierarchical polyaniline/polyvinylidene fluoride
nanofiber (HPPNF) film sandwiched between two interlocking electrodes
with microdome structure. Ascribed to the substantially enlarged 3D
deformation rates, these bioelectronics exhibit an ultrahigh sensitivity
of 53 kPa–1, a pressure detection range from 58.4
to 960 Pa, a fast response time of 38 ms, and excellent cycle stability
over 50 000 cycles. Furthermore, this conformally skin-adhered
sensor successfully demonstrates the monitoring of human physiological
signals and movement states, such as wrist pulse, throat activity,
spinal posture, and gait recognition. Evidently, this hierarchically
microstructure-bioinspired and amplified sensitivity piezoresistive
sensor provides a promising strategy for the rapid development of
next-generation wearable bioelectronics.