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Enhanced Strain Sensing Performance of Polymer/Carbon Nanotube‐Coated Spandex Fibers via Noncovalent Interactions
Macromolecular Materials and Engineering ( IF 3.9 ) Pub Date : 2019-12-15 , DOI: 10.1002/mame.201900525
Qin Chen 1 , Yuntao Li 1 , Dong Xiang 1 , Yongfeng Zheng 1 , Wanqiu Zhu 1 , Chunxia Zhao 1 , Hui Li 1 , Hongchang Han 1 , Yucai Shen 2
Affiliation  

Over the past decade, flexible strain sensors have been of tremendous interest due to their wide application in robotics, medical diagnostics, human motion detection, and healthcare. Herein, a fiber strain sensor is fabricated by continuously coating a layer of ultrathin multi‐walled carbon nanotube (MWCNT)/thermoplastic polyurethane (TPU) nanocomposites onto the surface of commercial spandex fiber. The effect of noncovalent functionalization of MWCNTs using 1‐pyrenecarboxylic acid (PCA) on the electrical conductivity as well as the sensing performance of the fiber sensor is investigated. The low‐cost strain sensor possesses a large workable strain (up to 200% strain), high sensitivity (gauge factor is 14 191.5 under 170–200% strain), and excellent stability (up to 1000 cycles), and regular signal responses within a wide measuring frequency range of 0.01–1 Hz are achieved with the introduction of PCA via enhanced nanotube dispersion and polymer–nanofiller interactions. Additionally, the resistance response to strain is fitted with a model based on tunneling theory to understand the sensing mechanism, and to prove that the fitted results are in agreement with the experimental results. Furthermore, the developed sensor is successfully applied in human motion detection, such as joint movement, facial microexpressions, and speech recognition.

中文翻译:

通过非共价相互作用增强了聚合物/碳纳米管包覆的氨纶纤维的应变传感性能

在过去的十年中,由于柔性应变传感器在机器人技术,医学诊断,人体运动检测和医疗保健中的广泛应用,引起了人们极大的兴趣。在此,通过在商用氨纶纤维表面上连续涂覆一层超薄的多壁碳纳米管(MWCNT)/热塑性聚氨酯(TPU)纳米复合材料来制造光纤应变传感器。研究了使用1-吡啶羧酸(PCA)对MWCNT进行非共价官能化对导电率以及光纤传感器的传感性能的影响。低成本的应变传感器具有较大的可工作应变(高达200%的应变),高灵敏度(在170–200%应变下的应变系数为14 191.5)和出色的稳定性(高达1000个循环),通过增强纳米管的分散性和聚合物-纳米填料的相互作用,引入PCA可以在0.01-1 Hz的宽测量频率范围内实现常规信号响应。另外,通过基于隧道理论的模型对应变的阻力响应进行拟合,以了解其传感机理,并证明拟合结果与实验结果相符。此外,开发的传感器已成功应用于人体运动检测,例如关节运动,面部微表情和语音识别。并证明拟合结果与实验结果吻合。此外,开发的传感器已成功应用于人体运动检测,例如关节运动,面部微表情和语音识别。并证明拟合结果与实验结果吻合。此外,开发的传感器已成功应用于人体运动检测,例如关节运动,面部微表情和语音识别。
更新日期:2020-02-14
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