Preparation And Characterization Of Electrostatically Spun Flexible Conductive Composite Fiber Films

In recent years,with the increasing popularity of flexible wearable devices and the expansion of flexible smart electronic devices and equipment in life applications,more and more flexible conductive composites are needed by the market and the development of related products.Compared with flexible metal sheets,yarns,fibers and other forms,some conjugated polymers with good electrical conductivity show excellent conductivity and conductivity can be adjusted,and some conductive polymers such as polypyrrole(PPY),polyaniline(PANI)and other advantages of cheap and easy to obtain,simple synthesis process,and strong operability.Therefore,flexible conductive composites combined with conductive polymers have shown good prospects in the field of flexible wearable devices and flexible electronics.On the other hand,the preparation of fiber substrates with high specific surface area by electrostatic spinning,followed by either the formation of double-layer fiber supercapacitors with electrolyte or the loading of conductive polymers on the fiber surface,has become one of the important methods for the preparation of conductive and energy-storing fibers.In this project,electrostatic spinning composite conductive fiber films with good conductivity and flexibility were prepared using polyacrylonitrile(PAN),carbon nanotubes(CNTs),nanoscale silver monomers(Ag)and polypyrrole(PPY)as experimental materials.In the paper,a high surface area flexible fiber substrate with good mechanical properties was firstly selected by evaluating the apparent morphology and mechanical properties of the fiber films;subsequently,PAN/CNTs flexible conductive fiber films doped with CNTs as conductive fillers were prepared by electrostatic spinning.And then in situ deposition of PPY was carried out on its surface to further enhance its conductive properties;finally,the enhancement effect of silver nanoparticles compounded with silver nanowires and CNTs on the conductive properties of the fiber films was compared.The synergistic effect of the silver-carbon composite filler on the electrical conductivity of the fiber films was analyzed to some extent.The results show that when the spinning voltage is 15 KV,the concentration of spinning solution is 12%,the mass fraction of doped CNTs is 0.3%,the spinning reception distance is 8 cm,and the receiver speed is 200 r/min,the PAN/CNTs/@PPY flexible conductive fiber film obtained by electrostatic spinning fiber forming and chemical in-situ deposition obtains the best mechanical and electrical conductivity properties,and the fiber The overall morphology was uniform.The lowest resistivity of 0.28 Ω·cm was obtained at 0 ℃,1:2 molar ratio of pyrrole monomer to ferric trichloride and 2 h.The PAN/Ag/CNTs/@PPY flexible conductive fiber films were prepared by using dual conductive fillers,i.e.,adding both CNTs and metallic silver monomers to the initial spinning solution.CNTs@PPY flexible conductive fiber films.The lowest resistivity of 0.16 Ω·cm was obtained when the mass ratio of Ag NWs to CNTs was 10:3,and the resistivity of the fiber films was lower when silver nanowires(Ag NWs)were used as conductive fillers compared to silver nanoparticles(Ag NPs).