Extremely Stretchable, Stable, and Durable Strain Sensors Based on Double-Network Organogels
Extremely Stretchable, Stable, and Durable Strain Sensors Based on Double-Network Organogels
复制标题
基于双网络有机凝胶的极其可拉伸、稳定且耐用的应变传感器
DOI：
10.1021/acsami.8b08873
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发表时间：
2018
影响因子：
9.5
通讯作者：
Zhang Shufen
中科院分区：
文献类型：
--
作者：
Zhang Haoxiang;Niu Wenbin;Zhang Shufen
可伸展应变传感器为现代电子产品的各种应用提供了巨大的潜力。然而，由于弹性基体的挑战，仍然难以制造具有极端拉伸性、高稳定性和上级耐久性的应变传感器。在这项工作中，第一个极端可拉伸和高度稳定的双网络乙二醇（EG）有机凝胶的例子是开发用于制造高性能的可穿戴应变传感器。结果表明，EG有机凝胶的物理交联和化学交联的双重网络结构使其具有21000%的拉伸性能，是目前文献报道的最高拉伸性能。同时，EG的低蒸气压赋予有机凝胶高的环境稳定性。受益于固有的拉伸性和稳定性的EG有机凝胶，应变传感器很容易制造，通过将石墨烯作为导电填料，其显示出非常宽的应变传感范围（>10 500%的断裂应变）与计量因子为2.3。更重要的是，该传感器可在空气中承受超过50000次的加载-卸载循环，表现出高稳定性和上级耐用性。实验证明，这些传感器可以跟踪人体的关节运动和肌肉振动（如关节运动、饮水、说话、呼吸、轻微咳嗽等），甚至可以区分不同方向的变形和头发的触碰。这项工作不仅提供了一种新的弹性矩阵平台，用于制造极端可拉伸，稳定和耐用的应变传感器，而且还展示了它们作为可穿戴电子设备的应用，用于跟踪人体的大小运动，可以进一步扩展到电子皮肤，人机交互和个性化健康监测的实际应用。
Stretchable strain sensors offer great potential for diverse applications in modern electronics. However, it is still difficult to fabricate strain sensors with extreme stretchability, high stability, and superior durability because of the challenge in elastic matrix. In this work, the first example of extremely stretchable and highly stable double-networks ethylene glycol (EG) organogel is developed for the fabrication of wearable strain sensors with high performances. It is shown that the formation of hybrid physically and chemically cross-linked double-networks endows the EG organogel with an extraordinarily stretchability as high as 21 000%, which is the highest value for gels reported in the literature. Meanwhile, the low vapor pressure of EG gives the organogel high ambient stability. Benefiting from the intrinsic stretchability and stability of EG organogel, the strain sensors are fabricated easily by incorporating graphene as electrically conductive filler, which display extremely wide strain-sensing range (>10 500% fracture strain) with a gauge factor of 2.3. More importantly, the sensor can withstand >50 000 loading–unloading cycles in air, exhibiting high stability and superior durability. It is demonstrated that these sensors can track joint movements and muscle vibrations (such as human joint motions, drinking, saying, breathing, and slight cough) of human body and even distinguish the deformations of different directions and the touches of a hair. This work not only provided a new elastic matrix platform for the fabrication of extremely stretchable, stable, and durable strain sensors but also demonstrates their applications as wearable electronic devices for tracking both large and tiny motions of human body, which could be further extended to the practical applications in electronic skin, human–machine interactions, and personalized health monitoring.