Abstract
Flexible piezoresistive sensors (FPS) have drawn great attention in electronic skin, wearable electronics and real-time health monitoring. In this work, the porous polydimethylsiloxane (PDMS)-carbon black (CB) (abbreviated as PDMS/CB) composite materials were prepared by a solvothermal method using spherulite NaCl(s) templates as pore-forming agents. The porosity of porous PDMS/CB composite materials was tuned by changing the NaCl(s) from 0 wt% to 20 wt%. FPS based on porous PDMS/CB was designed and prepared. The electrical and mechanical properties of porous PDMS/CB composite materials as well as performance of FPS were studied. With 18 wt% NaCl, PDMS/CB sensor exhibits a large sensitivity of 0.52 kPa−1 in the pressure ranges of 0.026–100 kPa, a high gauge factor of 346.1, a fast response of 46 ms, a low detection limit of 26 Pa as well as superior cyclic stability over 7500 cycles. In addition, PDMS/CB sensor was used for human motion monitoring to verify its sensing functionality.
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Acknowledgements
This work has been financially supported by the National Natural Science Foundation of China (No.61904040).
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CX: experiment design and conduction, data analysis, manuscript preparation. HL: data analysis and manuscript drafting. ZL, NL, and AW: experiment design, data analysis, manuscript preparation.
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Xu, C., Lu, H., Liu, Z. et al. Flexible piezoresistive sensors based on porous PDMS/CB composite materials prepared by the solvothermal method. J Mater Sci: Mater Electron 34, 906 (2023). https://doi.org/10.1007/s10854-023-10322-z
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DOI: https://doi.org/10.1007/s10854-023-10322-z