Dual-mode pressure sensors capable to perceive various external dynamic and static mechanical stimulus are constantly required to develop wearable electronics and smart subhuman robots. However, most sensors can hardly exhibit robust and reliable highly sensitive response to dynamic and static mechanical stimulus coming from rough or cuspidal surfaces. Here, we report a self-protective piezoelectric-piezoresistive dual-mode pressure sensor based on elastic cylinder induced flextensional transduction due to the positive Poisson effect. The cylindric design allows the transition from normal force to lateral expansion force, avoiding direct contact with rough or cuspidal surfaces and endowing the sensor with self-protective characteristic. Surprisingly, the flextensional transduction can give rise to more than 10 times amplification of the normal force to lateral expansion force, contributing to significantly enhanced sensitivity of the piezoresistive and piezoelectric response. Meanwhile, the open circuit voltage, short circuit current and power density of the device can reach up to 200 V, 8 μA and ~82 μW/cm², enlightening people to design high-performance piezoelectric energy harvesting devices. In addition, the dual-mode device exhibits great potentials for dynamic-static pressure detection and sports evaluation. The proposed flextensional transduction strategy provides people great inspirations to design self-protective sensing devices with dynamic-static mechanoresponse for more complex application scenarios.

能够感知各种外部动态和静态机械刺激的双模压力传感器不断需要开发可穿戴电子设备和智能超人机器人。然而，大多数传感器很难对来自粗糙或尖牙表面的动态和静态机械刺激表现出稳健和可靠的高灵敏度响应。在这里，我们报告了一种基于正泊松效应的基于弹性圆柱体诱导的弯张转换的自保护压电-压阻双模压力传感器。圆柱形设计允许从法向力到横向膨胀力的过渡，避免与粗糙或尖头表面直接接触，并赋予传感器自我保护特性。出奇，弯张转换可以将法向力放大 10 倍以上到横向膨胀力，有助于显着提高压阻和压电响应的灵敏度。同时，器件的开路电压、短路电流和功率密度可达200​​ V、8 μA和~82 μW/cm²、启发人们设计高性能压电能量收集装置。此外，双模装置在动静压检测和运动评估方面表现出巨大潜力。所提出的弯张转换策略为人们设计具有动态-静态机械响应的自我保护传感装置提供了很大的灵感，以适应更复杂的应用场景。