3D Printing of Flexible Liquid Sensor Based on Swelling Behavior of Hydrogel with Carbon Nanotubes
3D Printing of Flexible Liquid Sensor Based on Swelling Behavior of Hydrogel with Carbon Nanotubes
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DOI：
10.1002/admt.201800476
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发表时间：
2019-02-01
影响因子：
6.8
通讯作者：
Chen, Yong
中科院分区：
文献类型：
--
作者：
Li, Xiangjia;Yang, Yang;Chen, Yong
柔性传感器能够准确地检测环境刺激(如湿度和化学物质)，在生物医学工程和环境科学中引起了越来越多的研究兴趣。然而，由于材料发展、传感器设计和制造能力的限制，目前的工作主要集中在对液体赋存的各向同性传感上。3D打印用于构建多功能柔性液体传感器，该传感器具有能够对微液滴进行各向异性检测的多材料，并在此描述。以聚二丙烯酸酯(PEGDA)和多壁碳纳米管(MWCNT)为原料，制备了可探测化学液体的导电复合水凝胶。PEGDA/MWCNT复合水凝胶由于对液滴的吸附和相应的溶胀行为，其阻力显著增加，而纯PEGDA水凝胶的阻力显著降低。基于这两种复合水凝胶和相关的3D打印方法，研制了一种网状液体传感器，可以在短时间内有效地识别液体泄漏的位置和体积。此外，还展示了一种三层液体传感器，可实现对不同侧面液体泄漏的双向监测和检测。3D打印液体传感器为检测准确位置和方向的液体泄漏在各个领域的潜在应用提供了独特的视角。
Flexible sensors with accurate detection of environmental stimuli (e.g., humidity and chemical substances) have drawn increasing research interests in biomedical engineering and environmental science. However, most work is focused on isotropic sensing of liquid occurrence due to the limitation of material development, sensor design, and fabrication capability. 3D printing is used to build multifunctional flexible liquid sensors with multimaterials enabling anisotropic detection of microliquid droplets, and described herein. Electrical conductive composite hydrogels capable of detecting chemical liquid are developed with poly (ethylene diacrylate) (PEGDA) and multiwalled carbon nanotube (MWCNT). Due to the absorption of the liquid droplet and related swelling behavior, the resistance of PEGDA/MWCNT composite hydrogel increases dramatically, while the resistance of pure PEGDA hydrogel decreases significantly. Based on the two composite hydrogels and the related 3D printing method, a mesh-shaped liquid sensor that can effectively identify the position and volume of liquid leakage in a short time is developed. Furthermore, a three-layered liquid sensor to enable bidirectional monitor and detection of the liquid leakage in two different sides is demonstrated. The 3D-printed liquid sensor offers a distinctive perspective on the potential applications in various fields for detection of liquid leakage in accurate position and direction.