Stretchable pressure sensors are a key enabler of human-mimetic e-skin technology, with promising applications in soft robotics, prosthetics, biomimetics, and biosensors. Stretchable hybrid response pressure sensor (SHRPS) is an emerging type of soft pressure sensor that employs hybrid piezoresistive and piezocapacitive responses. A unique feature of SHRPS based on barely conductive porous nanocomposite (PNC) is its exceptional pressure sensitivity which trivializes its sensitivity to lateral stretch or shear. In this work, we experimentally characterize the electromechanical responses of SHRPS under various loading conditions and provide theoretical explanations through an equivalent circuit model. The capacitance and resistance of the PNC are described by a parallel mixing law and Archie’s law, respectively. Our model can reasonably predict the responses of SHRPS. Our findings reveal that SHRPS exhibits minimal sensitivity to stretch and shear because the hybrid response mechanism is activated only under compression. The effects of PNC-electrode contact impedance and fringe effects are discussed.

中文翻译：

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基于多孔纳米复合材料的可拉伸混合响应压力传感器的机电


可拉伸压力传感器是仿人电子皮肤技术的关键推动因素，在软机器人、假肢、仿生学和生物传感器方面具有广阔的应用前景。可伸缩混合响应压力传感器 （SHRPS） 是一种新兴的软压力传感器，采用混合压阻式和压电容式响应。基于几乎不导电的多孔纳米复合材料 （PNC） 的 SHRPS 的一个独特之处在于其出色的压力敏感性，这使其对横向拉伸或剪切的敏感性变得微不足道。在这项工作中，我们实验表征了 SHRPS 在各种负载条件下的机电响应，并通过等效电路模型提供理论解释。PNC 的电容和电阻分别由平行混频定律和 Archie 定律描述。我们的模型可以合理地预测 SHRPS 的反应。我们的研究结果表明，SHRPS 对拉伸和剪切的敏感性最小，因为混合响应机制仅在压缩下被激活。讨论了 PNC 电极接触阻抗和条纹效应的影响。