Wearable sensors for tracking human body motion are being increasingly applied in medical systems and are considered important components of human–machine interfaces. This study proposes a flexible sandwich-like capacitive pressure sensor that consists of carbon nanotube–polydimethylsiloxane (CNT–PDMS) composite electrodes and a porous polymer dielectric layer.

CNT yarn and polymer materials help fabricate a pressure sensor without complex patterns, easily and quickly. The dielectric layer is made of a porous polymer to improve the sensor sensitivity. The high porosity of the dielectric layer increases its deformation under pressure and enhances the sensitivity (to approximately 5.6 kPa⁻¹ (%)) even under low pressures (< 5 kPa). The sensitivity of the sensor varies according to the density of porosity and dielectric permittivity of the dielectric layer.

Owing to the high porosity of the dielectric layer and flexibility of the CNT yarn, the capacitive pressure sensor proposed in this study exhibits good performance in detecting even a slight change in stimulus. The proposed pressure sensor can be applied in wearable applications such as human-friendly interfaces and sensitive electronic skins.

用于跟踪人体运动的可穿戴传感器正越来越多地应用于医疗系统，并被认为是人机界面的重要组成部分。这项研究提出了一种类似碳纳米管-聚二甲基硅氧烷（CNT-PDMS）复合电极和多孔聚合物介电层的柔性三明治状电容式压力传感器。

CNT纱线和聚合物材料可帮助您轻松快速地制造出没有复杂图案的压力传感器。电介质层由多孔聚合物制成，以提高传感器灵敏度。即使在低压（＜5kPa）下，介电层的高孔隙率也增加了其在压力下的变形并提高了灵敏度（至约5.6kPa ^-1（％））。传感器的灵敏度根据介电层的孔隙率的密度和介电常数而变化。

由于介电层的高孔隙率和CNT纱线的柔韧性，本研究中提出的电容式压力传感器即使在微小的刺激变化下也表现出良好的性能。提出的压力传感器可以应用于可穿戴应用，例如人性化的界面和敏感的电子皮肤。