Multiaxially-stretchable kirigami-patterned mesh design for graphene sensor devices
Multiaxially-stretchable kirigami-patterned mesh design for graphene sensor devices
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DOI：
10.1007/s12274-020-2662-7
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发表时间：
2020-01-24
期刊：
影响因子：
9.9
通讯作者：
Nam, SungWoo
中科院分区：
文献类型：
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作者：
Lee, Hyo Chan;Hsieh, Ezekiel Y.;Nam, SungWoo
在可穿戴电子产品中，人们进行了大量研究，以赋予原本刚性的电子元件可拉伸性和灵活性，同时保持其电气性能。到目前为止，这已经通过刚性导电部件本身的各种几何修改来实现，例如微裂纹、弯曲或平面曲折结构。此外，人们还发现，将这些最终组件战略性地放置在整个设备中（例如将它们嵌入中性平面）可以进一步增强变形下的机械稳定性。然而，这些策略在性能上仍然受到限制，未能在双轴拉伸、扭曲和混合应变状态下实现完全应变不敏感的电性能。在这里，我们使用基于石墨烯的多轴可拉伸剪纸图案网状结构开发了一种用于可穿戴、无运动伪影传感器的新平台。在180度扭转和100%双轴应变下，电极和嵌入结构中的石墨烯的归一化电阻变化分别小于0.5%和0.23%。此外，在0%至100%双轴应变的重复拉伸-释放循环下，电阻变化限制在5%。此外，我们还通过有限元分析研究了结构的变形机制。根据模拟结果，我们推导出了一个无量纲几何参数，可以高精度预测结构的拉伸性。最后，作为概念验证，我们展示了一种基于双向可拉伸石墨烯的传感器阵列，能够以最小化的运动伪影监测温度和血糖水平。
In wearable electronics, significant research has gone into imparting stretchability and flexibility to otherwise rigid electronic components while maintaining their electrical properties. Thus far, this has been achieved through various geometric modifications of the rigid conductive components themselves, such as with microcracked, buckled, or planar meander structures. Additionally, strategic placement of these resulting components within the overall devices, such as embedding them at the neutral plane, has been found to further enhance mechanical stability under deformation. However, these strategies are still limited in performance, failing to achieve fully strain-insensitive electrical performance under biaxial stretching, twisting, and mixed strain states. Here, we developed a new platform for wearable, motion artifact-free sensors using a graphene-based multiaxially stretchable kirigami-patterned mesh structure. The normalized resistance change of the electrodes and graphene embedded in the structure is smaller than 0.5% and 0.23% under 180 degrees torsion and 100% biaxial strain, respectively. Moreover, the resistance change is limited to 5% under repeated stretching-releasing cycles from 0% to 100% biaxial strain. In addition, we investigated the deformation mechanisms of the structure with finite element analysis. Based on the simulation results, we derived a dimensionless geometric parameter that enables prediction of stretchability of the structure with high accuracy. Lastly, as a proof-of-concept, we demonstrated a biaxially-stretchable graphene-based sensor array capable of monitoring of temperature and glucose level with minimized motion-artifacts.