关键词: MXene, 棉/氨纶包芯纱, 导电涂层, 高弹性导电纱线, 热管理纺织品, 智能可穿戴

Abstract: "With the advent of the 5G era, various smart devices and terminal products have entered people’s lives. The development of flexible smart wearable devices in health, medical, and other fields has become a key area of focus. Especially with the intensifying aging of the population, there is a strong demand for smart wearable electronic devices used for health management. Compared to traditional rigid and bulky devices, these lightweight and flexible wearable electronic devices can better adapt to the curved surfaces of human skin and organs. However, under significant mechanical deformations, the conductive networks of wearable electronic devices can gradually break or fail due to stress. Therefore, the preparation of stretchable electronic devices that simultaneously possess high mechanical elasticity and stable conductivity remains a challenge. Textile materials, with their excellent flexibility, tensile strength, and stretch recovery, are outstanding substrate materials for the preparation of flexible smart devices. Among them, one-dimensional fibrous structures exhibit superb adaptability to arbitrary mechanical deformations compared to two-dimensional and three-dimensional structures. Furthermore, one-dimensional elastic fibers can be woven or knitted into large-scale fabrics, meeting the urgent needs for smart clothing. Cotton/spandex core-spun yarn, featuring a helical structure that enables large mechanical deformations, serves as an ideal substrate material. The coating method is commonly used for constructing fibrous stretchable conductors. However, conductive fibers prepared by surface coating face issues such as weak interfacial interaction, easy detachment of the conductive coating from the fiber, and low mechanical durability. Fortunately, MXene, with its high conductivity and abundant functional groups, can effectively address issues such as weak interfacial interaction, thereby enabling the construction of a highly interconnected conductive network on the fiber surface. In this paper, conductive nanomaterials were combined with high-elasticity yarns, using cotton/spandex core-spun yarn as the substrate material. Conductive networks were constructed by coating the yarn surface with MXene dispersions of different concentrations, successfully fabricating highly elastic and highly conductive yarn. Based on the helical structure of this high-elastic conductive yarn, it can effectively transfer and dissipate external loads, resist mechanical deformations such as bending, twisting, and stretching, while maintaining its highly stable electromechanical properties. The results show that the prepared high-elastic conductive yarn not only exhibits excellent mechanical stretchability (200%), but also demonstrates outstanding electromechanical and thermal properties under high mechanical deformations. Furthermore, this high-elastic conductive yarn exhibits prominent photothermal and electrothermal responses to optical/electrical stimuli, making it particularly useful in personalized thermal comfort and healthcare physiotherapy applications. Testing results indicate that this high-elastic conductive yarn has broad application prospects in personal thermal management textiles and smart wearable devices."

Key words: "MXene, cotton/spandex core-spun yarn, conductive coating, high-elastic conductive yarn, thermal management textile, smart wearable "