An increasing utilization of flexible and wearable electronics in human motion monitoring, healthcare monitoring and electronic skin urges the rapid development of flexible strain sensors. However, it is still a challenge to fabricate flexible strain sensors with both ultralow detection limit and wide sensing range. Herein, we develop a universal strategy to design the flexible strain sensor with both ultralow detection limit and wide sensing range based on the dual sensing layers with multiple sensing mechanisms, which can combine the advantages of sensing mechanisms of tunneling effect and crack propagation. Attributed to the multiple sensing mechanisms, the designed strain sensor possesses an ultralow detection limit of 0.01% and a wide sensing range (The maximum sensing strain is greater than 100%, high enough for all human motion monitoring). Moreover, excellent stretchability, fast response (68 m s)/recovery (68 m s), and outstanding reproducibility are achieved by this dual-sensing-layer sensor. Because of these outstanding performances, this strain sensor is capable of detecting and distinguishing both subtle physiological movements (e.g. pulse, coughing, and swallowing) and large-scale human motions (e.g. walking, leg lifting, and squatting), indicating great potential applications in wearable electronics. This work proposes a new strategy, i.e. constructing multilayer sensing structure with multiple response mechanisms, which may overcome the long-standing challenge of high-performance flexible strain sensor.

柔性和可穿戴电子产品在人体运动监测、医疗保健监测和电子皮肤中的应用越来越多，促使柔性应变传感器的快速发展。然而，制造具有超低检测限和宽传感范围的柔性应变传感器仍然是一个挑战。在此，我们开发了一种通用策略，基于具有多种传感机制的双传感层设计具有超低检测限和宽传感范围的柔性应变传感器，它可以结合隧道效应和裂纹扩展传感机制的优点。得益于多种传感机制，所设计的应变传感器具有0.01%的超低检出限和较宽的传感范围（最大传感应变大于100%，足以满足所有人体运动监测）。此外，这种双传感层传感器实现了出色的拉伸性、快速响应 (68 m s)/恢复 (68 m s) 和出色的再现性。由于这些出色的性能，这种应变传感器能够检测和区分细微的生理运动（例如脉搏、咳嗽和吞咽）和大规模的人体运动（例如步行、抬腿和蹲下），在以下方面具有巨大的应用潜力。可穿戴电子产品。这项工作提出了一种新策略，即构建具有多重响应机制的多层传感结构，这可能克服高性能柔性应变传感器长期存在的挑战。由于这些出色的性能，这种应变传感器能够检测和区分细微的生理运动（例如脉搏、咳嗽和吞咽）和大规模的人体运动（例如步行、抬腿和蹲下），在以下方面具有巨大的应用潜力。可穿戴电子产品。这项工作提出了一种新策略，即构建具有多重响应机制的多层传感结构，这可能克服高性能柔性应变传感器长期存在的挑战。由于这些出色的性能，这种应变传感器能够检测和区分细微的生理运动（例如脉搏、咳嗽和吞咽）和大规模的人体运动（例如步行、抬腿和蹲下），在以下方面具有巨大的应用潜力。可穿戴电子产品。这项工作提出了一种新策略，即构建具有多重响应机制的多层传感结构，这可能克服高性能柔性应变传感器长期存在的挑战。