Conjugate Electrospinning Construction And Characteristics Of Flexible One-Dimensional Nanomaterials Endowed With Luminescence-Electricity-Magnetism Multifunctionality

Recently,multifunctional nanomaterials have attracted much attention of researchers owing to their versatility.It has become one of the important research directions to highly integrate two or more functions into the same material to obtain multifunctional materials.Janus nanofibers have two different sides and can effectively separate several substances.Conjugate electrospinning depends on electrostatic interaction to combine two kinds of nanofibers with opposite charges to form Janus nanofibers.Meanwhile,the directional arrangement of the Janus nanofibers enables samples to obtain more superior performances.Therefore,it has become a very meaningful research topic to produce Janus nanofibers array via conjugate electrospinning and endow them with multifunctionality of fluorescence,magnetism and electrical conductivity.In this study,experimental device for conjugate electrospinning was constructed,and a series of the Janus nanofibers arrays with fluorescence,magnetism and electrical conductivity were successfully produced by using this technology,including[Fe₃O₄/Polyvinyl pyrrolidone（abbreviated as PVP）]//[Tb（BA）₃phen/PVP]magnetic-green fluorescent bifunctional Janus nanofibers array,[Eu（BA）₃phen/PVP]//[Fe₃O₄/PVP]red fluorescent-magneticbifunctionalJanusnanofibersarray,[Tb（BA）₃phen/polymethylmethacrylate（abbreviated as PMMA）]//[Polyaniline（abbreviated as PANI）/Fe₃O₄/PMMA]fluorescent-electrical-magnetic trifunctional Janus nanofibers array,{[Eu（BA）₃phen+Tb（BA）₃phen]/PVP}//[Fe₃O₄/PVP]color-tunable luminescence and magnetism bifunctional Janus nanofibers array.The results reveal that the nanofibers are directionally arranged on the micro level,and most of nanofibers have special Janus structure.The diameter distribution of nanofibers is uniform,and the average diameter of single nanofiber in the Janus nanofibers is in the range of 700 nm to 850 nm.Janus nanofibers are composed of two kinds of nanofibers with different characteristics.This especial structure confines electrical or magnetic substance and fluorescent substance into two single nanofibers,and reduces the influence of electrical or magnetic substance on the fluorescence intensity of sample.Therefore,the fluorescence intensity of sample is significantly improved.Conjugate electrospinning solves the dilemma of the diffusion of spinning dopes in the parallel spinneret under electrospinning,so that the efficiency of separating electrical or magnetic substance from fluorescent substance is improved,and the directional alignment of Janus nanofibers can reduce the loss of excitation and emission light.Therefore,the Janus nanofibers array constructed by conjugate electrospining has the strongest fluorescence intensity compared with the counterpart samples.In addition,the magnetism,fluorescence and electrically conductive anisotropy of Janus nanofibers array can be regulated by adjusting the ingredients and amounts of three raw materials in the samples.When the mass percentage of PANI to PMM is 70%,the conductance ratio between conductive and insulating orientation reaches 10⁷.Janus nanofibers array produced in this dissertation has potential applications in drug delivery,dual-mode imaging,electromagneticshieldingandnanodevicesduetotheirexcellent fluorescent-electrical-magnetic multifunction.In addition,this techniques can be extended to construct other multifunctional 1D Janus nanomaterial and 2D film.