The 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. Based on the research of flexible electronics (Advanced Functional Materials, 2020, 30(11), 1909603; Nano Energy, 2020, 72, 104706), theProf. Weiqing Yang, Weili Deng andYonghe Hu designed 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 excellent electrical performance. 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.
This work was published in ACS Nano. ProfessorWeiqing Yang,Weili Deng andYonghe Hu are the corresponding author and PhD. StudentTao Yang is the first author of the paper. The school of Materials Science and Engineering, Southwest Jiaotong University is the first unit of this paper.
Figure 1. Fabrication process, mechanism, and optical image the designed flexible wearable pressure sensors based on of PVDF/PANI nanofibers.
Figure 2. Characterization of hierarchical PVDF/PANI nanofibers and hierarchically patterned PDMS film.
Figure 3. Sensing mechanism of flexible pressure sensor.
Figure 4. Monitoring of human physiological signals and motions by the developed flexible sensor.
Hierarchically Microstructure-Bioinspired Flexible Piezoresistive Bioelectronics