Abstract
Poor linearity and high hysteresis as two crucial issues of stretchable and flexible strain sensors are urgently needed to be addressed to improve the sensors’ practical applicability. In this work, sacrificial template method coupled with ultrasonication technique are employed to fabricate a carbon black (CB)/polydimethylsiloxane (PDMS) foam (CPF) for tensile sensing. The CPF with a robust three-dimensional (3D) electrically conductive network exhibits excellent linearity and wide strain range (70% strain). The fabricated CPF possesses negligible electrical hysteresis of 1.2%, owing to the strong interactions between conductive nanofillers and the PDMS substrate. Low detection limit (0.5% strain), quick responsive time (100 ms), good response stability, excellent durability and reproducibility (>20,100 cycles) are achieved simultaneously. The prepared CPF is then assembled as a wearable sensor and it can monitor wide-range human motions in real-time, showing great potential in diverse practical applications in the near future.
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