Barati Milad, Nikfarjam Alireza
MEMS & NEMS Lab, Department of Microsystem and Photonics, School of Intelligent Systems Engineering, University of Tehran, Tehran, Iran.
Wearable Technol. 2025 Feb 10;6:e6. doi: 10.1017/wtc.2024.31. eCollection 2025.
Wearable pressure sensors with high sensitivity, fast response time, and low detection limit have great potential for blood pressure monitoring and early diagnosis of hypertension. This article introduces a piezoresistive pressure sensor based on carbon nanotubes (CNTs), polyaniline (PAni), and fabric (CNT/PAni/fabric) for health monitoring applications. This sensor is made by using two layers of linen fabric coated with CNT and PAni. These layers are placed on a polyester fabric substrate. One of the coated layers has a mesh structure, which increases the sensitivity of the sensor and lowers its detection limit. The CNT/PAni/fabric sensor has a high sensitivity of 2.035 kPa at pressures from 0 to 0.2 kPa, a response time of 290 ms, and a detection limit of 1.5 Pa. These features make it suitable for measuring blood pressure. The results obtained by measuring blood pressure using the pulse transit time method on four people, compared with the values obtained using the digital sphygmomanometer, show a discrepancy ranging between 0.019% and 1.62%. Also, the average error and standard deviation for the sensor measurement in systolic and diastolic pressures are 0.56 ± 0.33 and 0.57 ± 0.46, respectively, which shows that measurement with this sensor can be an alternative to existing devices.
具有高灵敏度、快速响应时间和低检测限的可穿戴压力传感器在血压监测和高血压早期诊断方面具有巨大潜力。本文介绍了一种基于碳纳米管（CNT）、聚苯胺（PAni）和织物（CNT/PAni/织物）的压阻式压力传感器，用于健康监测应用。该传感器由两层涂有CNT和PAni的亚麻织物制成。这些层放置在聚酯织物基板上。其中一层涂覆层具有网状结构，这增加了传感器的灵敏度并降低了其检测限。CNT/PAni/织物传感器在0至0.2 kPa压力下具有2.035 kPa的高灵敏度、290 ms的响应时间和1.5 Pa的检测限。这些特性使其适用于测量血压。通过对四个人使用脉搏传输时间法测量血压得到的结果，与使用数字血压计得到的值相比，差异在0.019%至1.62%之间。此外，该传感器在收缩压和舒张压测量中的平均误差和标准差分别为0.56±0.33和0.57±0.46，这表明使用该传感器进行测量可以替代现有设备。
