In this study, a novel sensor with high sensitivity and linear was prepared based on two-dimensional (2D) material (MXene) and ink, which can be used for deformation and damage monitoring of structural composites. The MXene was efficiently prepared by etching Ti3AlC2 powder with LiF–HCl solution and subsequent vacuum drying. The viscosity and adhesion of MXene/ink composites were controlled by changing the ratio of solvent (dimethyl sulfoxide) to ink. The MXene/ink was printed on the surface of the composite material to avoid forming defects in the composite material. The percolation threshold of the MXene/ink nanocomposite was relatively low, 3.6wt%. In this paper, MXene/ink composites with different contents were selected as the sensor, and the characteristics of the sensor were verified through monotone stretch and cyclic load-and-unload tests. When the MXene content just exceeds the percolation threshold (4wt%), the gauge factor (GF) of the sensor is higher, the results of monotonic tensile experiment show that there are two different sensitive stages of linear change (0 ~ 0.477%) and (0.477 ~ 1.37%), and the range GF is116.6 and 554.3, respectively. In addition, the linear relationship and sensitivity of the sensor remained stable after loading and unloading tensile tests. MXene/ink sensor has a broad application prospect in damage monitoring of aerospace structural composites.

中文翻译：

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具有表面印刷 MXene/墨水敏感传感器的聚合物复合材料的结构健康监测

在这项研究中，基于二维（2D）材料（MXene）和墨水制备了一种具有高灵敏度和线性的新型传感器，可用于结构复合材料的变形和损伤监测。通过用 LiF-HCl 溶液蚀刻 Ti3AlC2 粉末并随后真空干燥，可以有效地制备 MXene。MXene/油墨复合材料的粘度和附着力通过改变溶剂（二甲亚砜）与油墨的比例来控制。MXene/墨水被印刷在复合材料的表面，以避免在复合材料中形成缺陷。MXene/墨水纳米复合材料的渗透阈值相对较低，为 3.6wt%。本文选择不同含量的MXene/ink复合材料作为传感器，通过单调拉伸和循环加载-卸载测试验证了传感器的特性。当MXene含量刚好超过渗流阈值（4wt%）时，传感器的应变系数（GF）较高，单调拉伸实验结果表明线性变化有两个不同的敏感阶段（0~0.477%）和(0.477 ~ 1.37%)，范围 GF 分别为 116.6 和 554.3。此外，在加载和卸载拉伸测试后，传感器的线性关系和灵敏度保持稳定。MXene/墨水传感器在航空航天结构复合材料的损伤监测方面具有广阔的应用前景。此外，传感器的线性关系和灵敏度在加载和卸载拉伸测试后保持稳定。MXene/墨水传感器在航空航天结构复合材料的损伤监测方面具有广阔的应用前景。此外，传感器的线性关系和灵敏度在加载和卸载拉伸测试后保持稳定。MXene/墨水传感器在航空航天结构复合材料的损伤监测方面具有广阔的应用前景。