通过动态物理键和碳纳米管构建的多功能坚固双网络水凝胶可用作应变和压力传感器

IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-07-20 DOI:10.1007/s10971-024-06475-w
Yuan Zhao, Huixia Feng, Qiong Shang, Linhong Jiao
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引用次数: 0

摘要

碳基水凝胶具有良好的导电性和机械柔韧性,因此已成为可穿戴应变和压力传感器的理想材料。然而,碳基水凝胶也存在一些缺点,如拉伸性有限、易发生相分离等,导致其应用范围较窄。在本研究中,通过将金属离子和氧化多壁碳纳米管(oxCNTs)加入由阿拉伯树胶(GA)和丙烯酰胺(AM)、丙烯酸(AA)和 N-甲基丙烯酰胺(NMAM)聚合的共聚物组成的双网(DN)水凝胶中,制备了 GPEC 水凝胶。均匀分布的氧化碳纳米管和金属离子通过大量金属络键和氢键形成了水凝胶的三维(3D)结构。强相互作用改善了水凝胶的机械性能,断裂伸长率达到 1957%,断裂强度达到 915 kPa。此外,水凝胶还具有出色的自粘性和自愈合性。由于嵌入的金属离子和氧化碳纳米管形成了导电网络,水凝胶还具有高导电性。制备的应变传感器具有超高灵敏度(GF = 3.08)和快速响应(72 毫秒)。此外,当 GPEC 水凝胶组装成压力传感器时,还表现出很高的压力灵敏度(0-10 kPa 范围内为 2.27 kPa-1,20-80 kPa 范围内为 0.08 kPa-1)。因此,GPEC 水凝胶传感器可用于监测人体的全部运动范围,并可集成到用于手写识别的压力传感设备中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Multifunctional robust dual network hydrogels constructed via dynamic physical bonds and carbon nanotubes for use as strain and pressure sensors

Carbon-based hydrogels have emerged as a promising material for wearable strain and pressure sensors due to their excellent conductive and mechanical flexibility. However, some shortcomings such as limited stretchability and susceptibility to phase separation have led to a narrow range of applications. In this study, a GPEC hydrogel was prepared by incorporating metal ions and oxidized multi-walled carbon nanotubes (oxCNTs) into a double-network (DN) hydrogel consisting of gum arabic (GA) and a copolymer polymerized by acrylamide (AM), acrylic acid (AA) and N-methylolacrylamide (NMAM). The uniformly distributed oxCNTs and metal ions formed a three-dimensional (3D) structure of the hydrogel through a large amount of metal complex bonds and hydrogen bonds. The strong interaction improved the mechanical properties of the hydrogels, with an elongation at break of 1957% and a strength at break of 915 kPa. Furthermore, the hydrogels exhibited excellent self-adhesive and self-healing properties. The hydrogel also exhibits high conductivity due to the embedded metal ions and oxCNTs forming a conductive network. The as-prepared strain sensor revealed ultra-high sensitivity (GF = 3.08) and fast response (72 ms). Moreover, the GPEC hydrogel exhibits high pressure sensitivity (2.27 kPa−1 in the range of 0–10 kPa and 0.08 kPa−1 in the range of 20–80 kPa) when assembled into a pressure sensor. Consequently, the GPEC hydrogel sensor could be used to monitor the full range of human motion and could be incorporated into pressure sensing devices for handwriting recognition.

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来源期刊
Journal of Sol-Gel Science and Technology
Journal of Sol-Gel Science and Technology 工程技术-材料科学:硅酸盐
CiteScore
4.70
自引率
4.00%
发文量
280
审稿时长
2.1 months
期刊介绍: The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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