Properties Of Silver-coated Graphite Composite Particles And Conductive Composite Materials Based On Electrospun

In order to explore the applications of the previously synthesizedsilver-coated graphite(NG@Ag)core-shell compositeparticlesin the fields of conductive and electromagneticshielding composite materials,we clarified the relationship between microstructure and properties of this kind of compositeparticles.Polydopamine(PDA)layer could be formed on awide range of materials including polymers,ceramics,noblemetals,and semiconductors by self-polymerization of dopaminein an aqueous solution.In our work,we have demonstrated a method for PDAfunctionalization on styrene-butadiene-styrene(SBS)polymer nanofibers.Subsequently,the functionalized SBS nanofibers could adsorb numerous graphene oxides(GO)on their surfacedue to electrostatic attraction.Finally,reduced grapheneoxides(rGO)coated composite nanofibers have beensynthesizedby the further reduction reaction,and their flexible conductive composite materials have also beenprepared.The developedfabricationstrategyhas important practical significancein the field of flexible conductive composite materials.Here,taking into account thatthe present transparent conductor ITO is too brittle to be a flexible conductor,we have developed a new method to prepare transparent conductor based on wavy copper network,which is derived from a polystyrene mask by electrospun.Compared with the previously reported silver-coated non-metallic core–shell composite particles,the as-synthesized NG@Ag core–shell composite particles show a relatively high conductivity even when the Ag content is as low as 32 wt.%,implying the advantages of low density,high thermal stability and low cost.The polymer-based composite materials based on them exhibit excellent conductivity,strong shielding effectiveness and good anti-sedimentation,as well as good mechanical properties,conducting stability and small filling volume percentage,suggesting that the as-synthesized NG@Ag core–shell composite particles are promising materials for applications in conductive and electromagnetic shielding composite materials.Dopamine could self-polymerize on the surface of SBS nanofibers,which make them become more hydrophilic or higher electropositive than rawSBS nanofibers.Owing to electrostaticinteractions,the functionalized SBS nanofibers were coated with GO.GOcoated composite nanofibers were reduced by hydrogen iodide(HI),then,were transferred to flexible polymer matrix,thecomposite materials based on rGO-SBS network with flexibility and conductivitywere prepared successfully.We proposed a simple controllable approach to prepare wavy copper(Cu)microfiber arrays by electrospun using polystyrene(PS)microfibers as the templates.Wavy PS microfibers with different amplitude and wavelength were obtained by electrospinning.Wavy Cu microfibers and their array were obtained by using wavy PS microfiber as the templates and a wet etching technique.The prepared array of wavy copper microfibers exhibited an average transmittance of 87% and electrical resistance of 425?,indicating its potential application as electrode in transparent optoelectronics.