Research On Arrayed Sensor Fabric Based Composite Carbon Fiber

With the development of flexible wearable electronic devices,they play an important role between the individual and the ecological environment.At present,the major difficulties of flexible wearable devices are mainly concentrated in two aspects: materials and power modules.Traditional flexible materials mostly use thin-film materials as basic materials.The rigidity and brittleness of the devices make them incompatible with curved and soft human surfaces;traditional power modules are usually large in size,difficult to carry,and strong in rigidity.They are not compatible with emerging multifunctional electronic skin systems.In recent years,carbon-based composite materials have been widely used in flexible wearable sensing devices due to their good electrical conductivity and structural stability;fiber-structured flexible sensors are lightweight,ultra-thin,excellent flexibility,ductility,high sensitivity and fast response and the fiber fabric is well in line with the application of human wearable technology,and also used for flexible sensor platforms;the arrayed structure fabric can use the matrix addressable form to maintain its addressability,making the fabric look more sensitive.In our work,we start from carbon-based composite fiber materials to study the flexible wearable electronic devices.Firstly,we select sensing materials with good performance;secondly,we optimize the material composition and structure to achieve good sensing performance under the current experimental level;Thirdly,we assembly a series of electrode materials,and finally assembled them through woven fabric.The technology interlaces fiber electrodes to form a fabric-type flexible sensor,including a new type of flexible sensor with resistance effect and triboelectric effect.The application of fabric imaging,human-computer interaction,nature and ecology has been realized through circuit integration.The research mainly includes the following two aspects:(1)Firstly,we select the PET fiber as the substrate;secondly,we use the process of dip coating to coat the sensor material(activated carbon and PVDF mixed conductive)on the surface of the fiber filler,and then a conductive network with stable structure and uniform distribution was built.By optimizing the activated carbon content,coating times and other factors,the flexible tensile strain sensor can be assembled to form a fiber flexible tensile strain sensor,which can realize the function of rapid and sensitive response under a low tensile rate.After optimization,the resistance of the sensor can realize the monitoring of signals such as human body movement and stretching.(2)Firstly,we use the coating method to uniformly coat the graphene conductive layer to the high temperature resistant glass fiber to prepare the conductive fiber;secondly,we use the spray coating method to spray the PTFE polymer film layer on the graphene conductive layer;thirdly,we make it self-organized through annealing treatment nanoball raised array.By optimizing factors such as the thickness of the PTFE membrane layer and the annealing temperature of PTFE,the output voltage of the fiber electrode can reach up to 1000 mV.Lastly,we reuse the advantages of fiber structure devices that can be woven,combine with flying shuttle weaving technology to weave array sensor fabrics.The fabric can realize applications in fabric imaging,human-computer interaction,nature and ecology.