Carbon nanotube (CNT) based physical sensors with high performance have been successfully applied to novel devices for human motion detection and healthcare monitoring. Here, porous multi-walled carbon nanotube/polydimethylsiloxane MWCNT/PDMS composites with different MWCNT contents were fabricated via the water-oil emulsion state, and their impedance characteristics were investigated in detail. Intermediate MWCNT content induced both resistive and capacitive properties in the composites, while the composite with the highest MWCNT concentration showed resistive-dominant properties. In addition, an excellent piezo-impedance physical sensor using the MWCNT-loaded composites was demonstrated using an improved impedance sensing method. This work provides key information for realizing practical applications of MWCNT/PDMS composites.

具有高性能的基于碳纳米管（CNT）的物理传感器已成功应用于人体运动检测和医疗保健监视的新型设备。在此，通过水-油乳液状态制备了具有不同MWCNT含量的多孔多壁碳纳米管/聚二甲基硅氧烷MWCNT / PDMS复合材料，并对其阻抗特性进行了详细研究。中间CNT含量引起复合材料的电阻和电容特性，而具有最高MWCNT浓度的复合材料则表现出电阻主导的性能。此外，使用改进的阻抗传感方法，展示了使用负载MWCNT的复合材料制成的出色的压电阻抗物理传感器。这项工作为实现MWCNT / PDMS复合材料的实际应用提供了关键信息。