Boosted mechanosensitivity of stretchable conductive composite strain sensors based on kirigami cut design
JOURNAL OF MATERIALS CHEMISTRY C(2023)
摘要
Despite the recent advances in conductive elastomer composites (CECs) for wearable strain sensing, CEC-based resistive sensors usually suffer from limited mechanosensitivity, particularly at low strains. Here, we present a facile and universal way of boosting the strain sensitivity of resistive CEC sensors based on kirigami-cut designs. The strain-dependent reversible opening of kirigami cuts in the CEC sensory layer enables the device to exhibit high sensitivity over a wide strain range by allowing its resistance to increase rapidly at low strains and remain elevated at high strains. Various designs of kirigami-cut sensors are easily and reproducibly prepared via a programmable direct cut-patterning process. The fabricated sensors exhibit high maximum gauge factors of similar to 63.1 to similar to 5013.1 according to the kirigami design in low strain region (usually <7%) and operate stably with up to similar to 82.8 times larger resistance change than the pristine device at 80% strain. The sensor response is also highly stable and reversible, even when the device is subjected to repeated stretching (1000 cycles at 80%). Based on the boosted sensitivity coupled with mechanical stretchability, the kirigami-cut sensors are successfully used to sensitively monitor a wide range of human activities in real time, highlighting their practicality in diverse wearable sensor system applications.
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关键词
mechanosensitivity,sensors,strain
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