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Thermoplastic charge-transfer hydrogels for highly sensitive strain and temperature sensors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-03-20 , DOI: 10.1039/d2ta09751f Ru Zhang 1 , Cuiwen Liu 1 , Chengmeng Wei 1 , Yao Wang 1 , Feng Li 1 , Zhiqiang Zhang 1 , Jinqing Qu 2 , Ning Qing 1 , Liuyan Tang 1
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-03-20 , DOI: 10.1039/d2ta09751f Ru Zhang 1 , Cuiwen Liu 1 , Chengmeng Wei 1 , Yao Wang 1 , Feng Li 1 , Zhiqiang Zhang 1 , Jinqing Qu 2 , Ning Qing 1 , Liuyan Tang 1
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Recently, flexible wearable electronics have drawn increasing interest in health monitoring, human motion detection, artificial skin, and so on, owing to their comfort of wear and their ability to transmit real-time information. However, they generally show poor stretchability, low sensitivity, and single sensory function, which limit their practical applications. Herein, a series of conductive hydrogels (CT-K hydrogels) are developed using the CT complex of a viologen derivative and pyranine derivative (MS-CT complex) as the crosslinker. Their mechanical properties were highly tunable by adding different concentrations of KCl, reaching a maximum fracture strain of 1044%. Their ionic structure endowed them with an excellent conductivity of up to 6.75 S m−1. These hydrogels were fabricated as multifunctional sensors capable of detecting both strain and temperature with high sensitivity (gauge factor up to 8.71 and temperature coefficients of resistance up to −3.20% °C−1), a wide sensing range (900% strain and 5–70 °C) and reliable stability. Benefiting from the thermosensitivity and reversible interaction of the MS-CT complex, CT-K hydrogels had thermoplastic properties, and their sensing performance remained good after thermal treatment, demonstrating that the CT-K hydrogel-based sensors were recyclable and adaptable. This work paves the way for the development of high-performance hydrogel sensors using CT complexes, and promotes the versatile electronic applications of hydrogel sensors.
中文翻译：
用于高灵敏度应变和温度传感器的热塑性电荷转移水凝胶
最近，柔性可穿戴电子产品因其佩戴舒适和传输实时信息的能力而在健康监测、人体运动检测、人造皮肤等方面引起了越来越多的兴趣。然而，它们普遍表现出拉伸性差、灵敏度低、感觉功能单一等问题，限制了它们的实际应用。在此，使用紫精衍生物和吡喃衍生物的CT复合物（MS-CT复合物）作为交联剂开发了一系列导电水凝胶（CT-K水凝胶）。通过添加不同浓度的 KCl，可以高度调节它们的机械性能，达到 1044% 的最大断裂应变。它们的离子结构赋予它们高达 6.75 S m −1的优异电导率. 这些水凝胶被制成多功能传感器，能够以高灵敏度（应变系数高达 8.71，电阻温度系数高达 −3.20% °C -1 ）、宽传感范围（900% 应变和 5– 70 °C) 和可靠的稳定性。得益于MS-CT复合物的热敏性和可逆相互作用，CT-K水凝胶具有热塑性，热处理后其传感性能保持良好，表明基于CT-K水凝胶的传感器具有可回收性和适应性。这项工作为使用 CT 复合物开发高性能水凝胶传感器铺平了道路，并促进了水凝胶传感器的多功能电子应用。
更新日期：2023-03-20
中文翻译：
用于高灵敏度应变和温度传感器的热塑性电荷转移水凝胶
最近，柔性可穿戴电子产品因其佩戴舒适和传输实时信息的能力而在健康监测、人体运动检测、人造皮肤等方面引起了越来越多的兴趣。然而，它们普遍表现出拉伸性差、灵敏度低、感觉功能单一等问题，限制了它们的实际应用。在此，使用紫精衍生物和吡喃衍生物的CT复合物（MS-CT复合物）作为交联剂开发了一系列导电水凝胶（CT-K水凝胶）。通过添加不同浓度的 KCl，可以高度调节它们的机械性能，达到 1044% 的最大断裂应变。它们的离子结构赋予它们高达 6.75 S m −1的优异电导率. 这些水凝胶被制成多功能传感器，能够以高灵敏度（应变系数高达 8.71，电阻温度系数高达 −3.20% °C -1 ）、宽传感范围（900% 应变和 5– 70 °C) 和可靠的稳定性。得益于MS-CT复合物的热敏性和可逆相互作用，CT-K水凝胶具有热塑性，热处理后其传感性能保持良好，表明基于CT-K水凝胶的传感器具有可回收性和适应性。这项工作为使用 CT 复合物开发高性能水凝胶传感器铺平了道路，并促进了水凝胶传感器的多功能电子应用。
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