高灵敏度柔性压阻压力传感器，采用 PDMS/MWNTS 纳米复合材料膜，并用异丙醇增强，用于脉搏检测。

High-Sensitivity Flexible Piezoresistive Pressure Sensor Using PDMS/MWNTS Nanocomposite Membrane Reinforced with Isopropanol for Pulse Detection.

机构信息

Med + X Center for Manufacturing, West China Hospital of Sichuan University, Chengdu 610041, China.

School of Mechanical Engineering, Sichuan University, Chengdu 610065, China.

出版信息

Sensors (Basel). 2022 Jun 24;22(13):4765. doi: 10.3390/s22134765.

DOI:10.3390/s22134765

PMID:35808262

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9269151/

Abstract

Flexible pressure sensors with high sensitivity and good linearity are in high demand to meet the long-term and accurate detection requirements for pulse detection. In this study, we propose a composite membrane pressure sensor using polydimethylsiloxane (PDMS) and multiwalled carbon nanotubes (MWNTS) reinforced with isopropanol prepared by solution blending and a self-made 3D-printed mold. The device doped with isopropanol had a higher sensitivity and linearity owning to the construction of additional conductive paths. The optimal conditions for realizing a high-performance pressure sensor are a multiwalled carbon nanotube mass ratio of 7% and a composite membrane thickness of 490 μm. The membrane achieves a high linear sensitivity of -57.07 kΩ∙kPa and a linear fitting correlation coefficient of 98.78% in the 0.13~5.2 kPa pressure range corresponding to pulse detection. Clearly, this device has great potential for application in pulse detection.

摘要

具有高灵敏度和良好线性度的柔性压力传感器能够满足长期、精确的脉搏检测需求。在这项研究中，我们提出了一种使用聚二甲基硅氧烷（PDMS）和多壁碳纳米管（MWNTS）的复合膜压力传感器，该传感器采用异丙醇溶液共混和自制 3D 打印模具制备。掺杂异丙醇的器件由于构建了额外的导电通路，因此具有更高的灵敏度和线性度。实现高性能压力传感器的最佳条件是多壁碳纳米管质量比为 7%，复合膜厚度为 490μm。在对应脉搏检测的 0.13~5.2kPa 压力范围内，该膜的线性灵敏度高达-57.07kΩ·kPa，线性拟合相关系数为 98.78%。显然，该器件在脉搏检测中具有很大的应用潜力。