Flexible wire-shaped strain sensor from cotton thread for human health and motion detection.
Flexible wire-shaped strain sensor from cotton thread for human health and motion detection.
复制标题
用于人体健康和运动检测的棉线柔性线形应变传感器
DOI：
10.1038/srep45013
复制
发表时间：
2017-03-21
影响因子：
4.6
通讯作者：
Liao K
中科院分区：
文献类型：
--
作者：
Li YQ;Huang P;Zhu WB;Fu SY;Hu N;Liao K
采用聚二甲基硅氧烷（PDMS）弹性体封装导电碳丝（CT），制作了一种线状柔性应变传感器。采用棉线在N2气氛中热解的方法制备了关键的应变敏感材料CT。CT/PDMS复合丝表现出典型的压阻特性，具有很高的应变灵敏度。在0-4%的低应变和8-10%的高应变下计算的应变系数（GF）分别为8.7和18.5，这远远高于传统的金属应变传感器（GF约为2）。线状CT/PDMS复合材料传感器对应变范围为0- 10%、频率范围为0.01-10 Hz的循环拉伸载荷显示出优异的响应，最高可达2000次循环。通过对手指运动和脉搏的监测，证明了该传感器作为可穿戴应变传感器的潜力。基于CT/PDMS复合材料的线状传感器具有成本低、结构简单、制作工艺简单、体积小、性能优良等特点，在可穿戴电子产品中具有很大的应用潜力。
In this work, a wire-shaped flexible strain sensor was fabricated by encapsulating conductive carbon thread (CT) with polydimethylsiloxane (PDMS) elastomer. The key strain sensitive material, CT, was prepared by pyrolysing cotton thread in N2 atmosphere. The CT/PDMS composite wire shows a typical piezo-resistive behavior with high strain sensitivity. The gauge factors (GF) calculated at low strain of 0–4% and high strain of 8–10% are 8.7 and 18.5, respectively, which are much higher than that of the traditional metallic strain sensor (GF around 2). The wire-shaped CT/PDMS composite sensor shows excellent response to cyclic tensile loading within the strain range of 0–10%, the frequency range of 0.01–10 Hz, to up to 2000 cycles. The potential of the wire senor as wearable strain sensor is demonstrated by the finger motion and blood pulse monitoring. Featured by the low costs of cotton wire and PDMS resin, the simple structure and fabrication technique, as well as high performance with miniaturized size, the wire-shaped sensor based on CT/PDMS composite is believed to have a great potential for application in wearable electronics for human health and motion monitoring.