Temperature-Responsive Ionic Conductive Hydrogel for Strain and Temperature Sensors
Temperature-Responsive Ionic Conductive Hydrogel for Strain and Temperature Sensors
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用于应变和温度传感器的温度响应离子导电水凝胶
DOI：
10.1021/acsami.2c06952
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发表时间：
2022-06-03
影响因子：
9.5
通讯作者：
Ma, Lie
中科院分区：
文献类型：
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作者：
Pang, Qian;Hu, Hongtao;Ma, Lie
柔性可穿戴设备凭借多信号采集和信息实时无线传输的优势，在健康监测领域取得了显着的应用。然而，传统可穿戴设备中笨重的传感元件和刚性金属电路元件的集成可能会导致可穿戴设备与生物组织之间的机械和信号传导不匹配，从而限制其在人体中的广泛应用。导电水凝胶优异的机械性能、导电性和高组织相似性有助于其在柔性电子传感器中的应用，以监测人体健康。在这项工作中，通过将聚乙烯吡咯烷酮（PVP）/单宁酸（TA）/ Fe3+交联网络引入到N，N-亚甲基二丙烯酰胺（MBAA）交联聚（N-异丙基丙烯酰胺-共-丙烯酰胺）（P（NIPAAm-co-AM））网络中，开发了一种具有优异拉伸性、快速温度响应性和良好导电性的双网络温度响应型离子导电水凝胶。此外，PVP/TA/Fe3+交联网络的引入赋予水凝胶优异的拉伸性和导电性。通过将 TA 和 Fe3+ 的摩尔比调整为 3:5，获得了最大拉伸比为 720% 且应变响应灵敏（GF = 3.61）的水凝胶，在可穿戴应变传感器中显示出良好的应用前景，可监测人体大运动和精细运动。此外，通过引入具有较低临界溶液温度（LCST）的PNIPAAm，水凝胶可用于通过温度-电导率响应来监测环境温度，从而可用作可穿戴温度传感器来检测人体内的发烧或组织高温。
Flexible wearable devices have achieved remarkable applications in health monitoring because of the advantages of multisignal collecting and real-time wireless transmission of information. However, the integration of bulky sensing elements and rigid metal circuit components in traditional wearable devices may lead to a mechanical and signal-conducting mismatch between wearable devices and biological tissues, thus restricting their wide applications in the human body. The excellent mechanical properties, conductivity, and high tissue resemblance of conductive hydrogel contribute to its application in flexible electronic sensors to monitor human health. In this work, a dual-network, temperature-responsive ionic conductive hydrogel with excellent stretchability, fast temperature responsiveness, and good conductivity was developed by introducing a polyvinylpyrrolidone (PVP)/tannic acid (TA)/ Fe3+ cross-linked network into the N,N-methylene diacrylamide (MBAA) cross-linked poly(N-isopropylacrylamide-co-acrylamide) (P(NIPAAm-co-AM)) network. Furthermore, the introduction of the PVP/TA/Fe3+ cross-linked network endowed the hydrogel with excellent stretchability and conductivity. By adjusting the molar ratio of TA and Fe3+ to 3:5, a hydrogel with a maximal stretching ratio of 720% and sensitive strain response (GF = 3.61) was achieved, showing a promising application in wearable strain sensors to monitor both large and fine human motions. Moreover, by introducing PNIPAAm with a lower critical solution temperature (LCST), the hydrogel may be used to monitor the environmental temperature through the temperature-conductivity responsiveness, which can be applied as a wearable temperature sensor to detect fever or tissue hyperthennia in the human body.