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

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 0.01531kPa⁻¹ and a wide pressure sensing range 0-150kPa 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