Study On The Properties Of Electronic Textiles Based On In-Situ Gas Phase Polymerization PEDOT:TOS Functional Layer

With the development of science and technology and the progress of society,people’s demand for intelligent wearable is growing.Because of its excellent flexibility and breathable and absorbent properties,fabric is more and more selected as the substrate material of flexible electronic devices,which is widely used in the field of wearable electronics.Electronic textiles with stability,electrical conductivity and wearable comfort are an important part of the field of flexible wearable electronics.Among them,the realization of high electrical conductivity of ordinary fabrics and the ability to meet the bending,stretching and even washing state still maintain electrical stability is the basis of various textile based wearable electronic devices.By modifying the fiber fabric and introducing functional groups on the fiber surface,the accumulation and adhesion of conductive polymer on the fiber fabric surface can be promoted through the chemical bond force between the groups,so that the conductive fabric prepared finally has high electrical conductivity and high washable stability.The synthesis of conductive polymers based on gas phase polymerization(VPP)technology,the preparation of flexible wearable electronic devices and the creation of new applications are important development directions in the field of smart wearable.The technical advantages of VPP are simple operation,no restrictions on the base material,and the ability to obtain intrinsically conductive polymers with high conductivity.Conductive polymer poly(3,4-ethylenedioxythiophene)(PEDOT)is one of the most promising organic thermoelectric materials with good mechanical properties,low intrinsic thermal conductivity and controllable conductivity.Among PEDOT derivatives,toluenesulfonate-doped PEDOT(PEDOT-TOS)is popular in the field of smart textiles due to its workability in solution,wide range of conductivity variation,high electrochemical and thermal stability.Based on this,this paper mainly studies the following contents:(1)Cationic modification of 3-chloro-2-hydroxypropyl trimethylammonium chloride,nitric acid liquid phase oxidation modification and electron beam radiation grafting of acrylic acid modification were carried out on four kinds of fabrics,cotton,polyester,polyurethane and arylon,and hydroxyl,carboxyl and other oxygen-containing functional groups were successfully grafted on the fabric base surface.The surface morphology of the fabric has no obvious change before and after modification.(2)In-situ gas phase polymerization of PEDOT:TOS conductive layer based on modified fabric substrate.After modification,the content of PEDOT accumulated in conductive fabric with PEDOT:TOS functional layer increased significantly,and the resistance decreased significantly.Among them,the modification effect of electron beam radiation grafting acrylic acid is the most obvious,and the conductive fabric obtained based on this modification method has the highest conductivity.The water contact Angle test was carried out on the fabric before and after modification,and the modification had an effect on the wettability of the fabric,which would lead to the change of the adsorption amount of the oxidant in the gas phase polymerization,but the modification did not completely improve the wettability of all the fabrics.Therefore,the key to the improvement of the electrical conductivity was the electrostatic attraction between the graft functional group,the oxidant and the conductive substance.At the same time,the washable resistance was tested.After modification,the conductive fabric maintained good water resistance stability.(3)A capacitive array flexible pressure sensor was prepared based on electron beam radiation grafted with acrylic substrate in-situ gas gathering PEDOT:TOS conductive fabric.The sensor points were connected to a computer to prepare an intelligent insole that could carry out human-computer interaction.The intelligent insole could be used for real-time pressure detection and gait analysis.The pressure recovery,sensitivity and cycle stability of the sensor were tested.After 10000 cycles,the sensor still maintained good stability.