Abstract: Flexible sensors have the characteristics of well flexibility, ductility, lightness and portability, can be bent or even folded, can adapt to the measurement of physiological signals of complex surfaces, and have a broad market in medical care, motion monitoring, robot human-computer interface, etc. However, there are still many problems to be solved in the development of flexible sensors. During fabrication of high-performance sensors, complex and costly manufacturing processes are often involved, such as 3D electronic printing, metal plasma deposition, silicon based etching and other technologies. It is difficult to achieve large-scale, low-cost, high-performance flexible sensor preparation. Therefore, it is still an urgent problem to develop flexible stress sensors with light weight, high reliability, high sensitivity, fast response, low hysteresis and good biocompatibility to adapt to different applications. MXene, as a new two-dimensional nano material, has excellent conductivity, good mechanical properties and high specific surface area. At present, MXene materials are mostly used in energy storage, catalysis, electromagnetic materials and other fields, and there is less research work in the field of flexible sensors. Therefore, studying the application of new material MXene in the field of flexible sensors and exploring its sensing mechanism will not only help broaden the application scope of MXene material, but also further develop the application of wearable electronic devices.
In order to obtain a flexible strain sensor with a large strain sensing range and high sensitivity, SF with excellent mechanical properties and good biocompatibility is used as the matrix. MXene material is obtained by etching Ti3AlC2 with HF as the additive material. The nanofiber composite membrane with high porosity, large specific surface area and high permeability is obtained by electrospinning after blending SF and MXene, and its structure and properties are analyzed. It is found that the flexible sensor prepared by this method not only has good mechanical and physical properties such as light weight, high stability, and good durability, but also has good sensing properties such as high conductivity, high sensitivity, and fast response speed, which can maintain the initial resistance after 6000 bending cycles.
MXene shows great application prospects in the field of flexible sensors. As a thin, portable and highly sensitive flexible sensor, SF/MXene sensor is convenient for people to monitor health, sports and other information anytime and anywhere, which is conducive to timely discovery, prevention or rehabilitation of diseases, and has good application prospects in medical care, sports monitoring and other fields.

Key words: silk fibroin, MXene, composite membrane, electrospinning, flexible sensor

摘要： 为获得具有良好导电性和响应时间的柔性传感器，以丝素蛋白(SF)作为基体，自制Ti3C2Tx MXene为功能材料，通过控制加入MXene的量，采用静电纺丝技术制备出不同配比的SF/MXene复合膜。采用扫描电子显微镜、傅里叶变换红外光谱、X射线衍射及2400源表对复合膜的微观形貌、分子结构、导电性能以及传感性能进行了表征。结果表明：当添加4%质量分数的MXene时，复合膜具有最好的传感性能(电导率为1.24 mS/m)和机械性能(断裂应力为2.1 MPa)；复合膜经过6000次弯曲循环后电阻仍可以保持初始的大小，具有良好的稳定性和耐久性；且该传感器具有较快的响应(72 ms)和恢复时间(64 ms)。实验结果证明，SF/MXene复合膜作为一种柔性传感器具有良好的应用前景。

关键词: 丝素蛋白, MXene, 复合膜, 静电纺丝, 柔性传感器