▎ 摘　　要

The rational structural design of materials is an efficient strategy for optimizing the sensing properties of pressure sensors for electronic skins. Here, inspired by the arches of the foot, a novel Janus graphene film (JGF) with concave-convex arch-shaped microstructures on both surfaces is presented. Then, a polymer-substrate-free pressure sensor with a wide sensing range, fast response time, and good stability is fabricated using a face-to-face assembly method. Its special microstructures can effectively hinder the full contact of two face-to-face JGF electrodes and lead to a tunable pressure-dependent contact area. Subtle pressure variations can be captured due to these special arch-shaped microstructures. Hence, the JGF-based pressure sensor could be used to monitor the vital signs of the human body such as human-body motion, breathing, and arterial pulse. Stable epidermal pulse wave signals are detected, and a series of indices are extracted to assess arterial stiffness and vascular aging. Thanks to its low-cost, simplified fabrication process, the pressure sensor exhibits great potential for monitoring health in real time and screening for arteriosclerotic disease.