Abstract: With the advancement and development of smart wearable devices, various styles of sensors have been utilized in various fields of human life, such as energy storage, electronic skin, smart healthcare, and human-computer interaction. Traditional sensors, made of rigid materials, fail to adapt to diverse and complex application scenarios, making flexible sensors the main research direction. The material substrates of flexible sensors usually include thin films, paper, polymers, hydrogels and fabrics. Among them, electronic textiles composed of natural fabrics have emerged as promising materials for constructing wearable sensors due to their flexibility and biocompatibility. Fabrics, with their natural interwoven structure and loftiness, provide a good foundation for the design of flexible sensors. The cashmere fabric, a natural protein fiber and an important raw material in textile production, boasts exceptional comfort and biodegradability, making it a promising candidate for applications in the wearable sector. The principles of fabric pressure sensors mainly include piezoelectricity, triboelectricity, capacitance, and piezoresistivity. Specifically, piezoresistive sensors have received great attention due to their simple preparation process and ease of signal processing and acquisition. Fabric pressure sensors are prepared by combining conductive materials (such as carbon nanotubes, graphene, and metal nanowires) with fabrics to prepare functional fabrics that enable pressure sensing. In recent years, the novel two-dimensional transition metal carbide MXene has been widely used in the field of smart wearable sensors due to its excellent conductivity, high specific surface area, flexibility, and processability. In addition, the abundance of hydrophilic and reactive functional groups (such as −F, −OH, −O, etc.) on the surface of MXene not only endows it with superior hydrophilicity but also enables it to form good interfaces with various substrate materials. The introduction of MXene can not only provide good electrical conductivity to cashmere fabrics but also retain their mechanical properties and flexibility, thereby providing a new approach for constructing high-performance flexible pressure sensors. In this paper, a cashmere knitted fabric pressure sensor based on MXene was constructed through a simple and repeatable impregnation-drying preparation process to achieve efficient compositing of MXene with cashmere fabrics. SEM characterization of the fabric's morphology confirmed the successful attachment of MXene onto the surface of cashmere fibers. The pressure sensing mechanism was analyzed based on the fabric structure and equivalent circuit diagrams. Three pressure sensors with different MXene immersion times were designed, and it was found that the fabric impregnated twice had better sensitivity. The fabric impregnated twice was selected for testing. The sensor demonstrates good sensitivity (with a maximum sensitivity of 0.01,531 kPa-1) and a wide pressure sensing range (0-150 kPa), exhibiting excellent pressure-resistance cyclic stability. Furthermore, it can not only be used to monitor human joint movement health, but also to monitor finger touches for transmitting Morse code messages.

Key words: fabric pressure sensor, MXene, cashmere fabric, smart textiles, piezoresistive sensor

摘要： 为获得基于羊绒针织物的柔性压力传感器，选用MXene作为导电活性材料，以羊绒针织物为基底，采用浸渍-干燥工艺制备了织物基压力传感器。设计不同浸渍次数的压力传感器，探究浸渍次数对灵敏度的影响，并对传感器进行形貌观察和传感性能测试分析。结果表明：羊绒织物浸渍MXene溶液后，MXene可以有效地附着在羊绒纤维上形成导电通路；浸渍次数为2次的羊绒针织物压力传感器的灵敏度最高，在0~50 kPa范围内灵敏度为0.01531 kPa-1；压力传感范围在0~150 kPa；在不同应力条件下，该传感器展现出优异的稳定性和重现性，经过超1000秒的压力加载/卸载循环测试，其传感性能仍保持稳定；该传感器可以用于人体关节运动监测，也可以通过按压时间长短实现摩斯密码信息传递，用于加密通讯和救援等领域。MXene基羊绒针织物压力传感器在可穿戴纺织品领域具有应用潜力。

关键词: 织物压力传感器, MXene, 羊绒织物, 智能纺织品, 压阻式传感器