Great progress has been made to enhance the sensitivity of flexible pressure sensors recently. However, the format of these sensors has largely been limited to thin films. A highly sensitive pressure sensor based on coatings, which can ensure uniform coverage over large area as well as conformal contact with complex surfaces because of the flowability before solidification, has rarely been reported. Here, a highly sensitive capacitive pressure sensing coating is demonstrated for the first time. This sensor utilizes conductive composite coatings as electrodes and thermally expandable microspheres/polydimethylsiloxane composite coating as the dielectric layer. The expanded microspheres greatly enhance the compressibility and thus increase the sensitivity of the pressure sensors to 0.201 kPa⁻¹ under 50 kPa. At the same time, it achieves the largest pressure‐sensing range in capacitive pressure sensors so far from 10 Pa to 4.5 MPa with a sensitivity of 3 × 10⁻⁴ kPa⁻¹. It also features low hysteresis and good stability against repeated compression. More importantly, the format of coating not only reduces the cost and complexity of fabrication, but also facilitates the applications on surfaces with complex shapes, which paves the way for facile and economic application of flexible pressure sensors in the future.

中文翻译：

---

基于热膨胀性微球的高灵敏适形压力传感涂层

近来，在增强柔性压力传感器的灵敏度方面已经取得了巨大的进步。但是，这些传感器的格式在很大程度上限于薄膜。很少有基于涂层的高度灵敏的压力传感器的报道，由于固化前的流动性，该传感器可以确保大面积的均匀覆盖以及与复杂表面的共形接触。在这里，首次展示了高灵敏度的电容式压力感应涂层。该传感器利用导电复合涂层作为电极，利用可热膨胀的微球/聚二甲基硅氧烷复合涂层作为介电层。膨胀的微球大大提高了可压缩性，因此将压力传感器的灵敏度提高到0.201 kPa ^-1低于50 kPa。同时，它在电容式压力传感器中实现了最大的压力传感范围，从10 Pa到4.5 MPa，灵敏度为3×10 ^-4 kPa ^-1。它还具有低滞后性和良好的抗重复压缩稳定性。更重要的是，涂层的形式不仅降低了制造成本和复杂性，而且还促进了在形状复杂的表面上的应用，这为将来灵活而经济地应用柔性压力传感器铺平了道路。