Abstract: Developing gated strain sensors with high sensitivity and a wide sensing range is crucial for medical supervision, motion monitoring, and human–machine interaction tasks. However, traditional gated sensors lack real-time tunability after fabrication and have a limited tunable range. Herein, we propose a design that integrates a detachable negative Poisson’s ratio metamaterial structure with a gated flexible strain sensor. By using a detachable metamaterial layer with a tailored Poisson’s ratio, the local strain field distribution during stretching can be effectively modulated, enabling controllable regulation of the gated structure’s closure behavior. Through systematic adjustment of the embedment depth, thickness, and microstructural dimensions of the perforated plate metamaterial, bidirectional tunability of the sensing response regime is realized, enabling full-range coverage from 0% to 100% strain. Additionally, the sensor exhibits high sensitivity (a gauge factor of 3049), an ultralow limit of detection (0.08%), a fast response time (100 ms), exceptional stability (negligible variation over 2000 cycles), and excellent frequency adaptability. A smart resistance band system is developed to demonstrate personalized movement recognition for users of varying heights performing exercises such as dips and curls. This work establishes a new paradigm for tunable strain sensors, with promising implications for smart personalized athletic and health monitoring devices.

集成可拆卸超材料的性能可调门控应变传感器用于个性化运动识别

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