Preparation And Properties Of Highly Conductive Organic Fibers For ECG Monitoring Fabrics

Conductive fibers with high conductivity and high strain stability are important materials for the development of new applications such as wearable medical devices,energy harvesting fabrics,soft display screens,and smart clothings.However,the complicated preparation process,high cost,and low strain stability of the present methods in laboratory studies have greatly restricted the mass application of this material.In order to fulfil the demands of vast applications in practical market and research for high value products,one-dimensional nanomaterials with good conductivity and deformation durability are used as conductive coatings.The method of multiple coating of coaxial nozzles based on corona treatment is designed to fabricate highly conductive organic fibers.It uses the polyol method to prepare silver nanowires(Ag NWs),and compares the dispersion effect of different surfactants on carbon nanotubes(SWCNTs),and use these two materials as a conductive coating.During fiber preparation,the substrate fibers are first pretreated by corona treatment,which can increase the adhesion between the substrate fibers to the coating.Then,two kinds of coated conductive composite organic fibers are successfully prepared by multiple coating methods with coaxial nozzles.Through characterization and testing,the morphology,electrical conductivity,strain stability,tensile-recovery properties of the two composite conductive fibers are compared.The results show that Ag NWs coated fibers have good conductivity,elasticity and strain stability,and poor tensile-recovery durability.SWCNTs coated fiber has better conductivity,elasticity and good conductivity sensitivity and tensile-recovery durability.The analysis shows that the high conductivity and high strain stability of the Ag NWs-coated fibers are due to the stable resistance network of Ag NWs formed by heating and radiation welding.SWCNTs coated fibers with high conductance sensitivity conforming to the random tunnel junction model may be a good substrate for strain sensor fibers.ECG signals are important physiological signals of the human body.Therefore,it is of great reference significance to verify that the high conductive organic fiber can be used in ECG monitoring fabric and has good ECG signal transmission function.Based on this,the ECG acquisition platform is designed to test the ECG transmission stability of highly conductive fibers.The ECG acquisition platform mainly includes six parts:power management module,MCU control module,multi-way switch control module,antenna module,ECG acquisition module and system software design.The results prove that Ag NWs coated conductive fibers have good reliability and stability of ECG signal transmission.The prepared high conductivity and high stability fiber provides a new solution for the realization of intelligent clothing for human physiological signal monitoring.