Design And Electrospinning Construction Of Dual-Anisotropic Conductive Film Functionalized By Magnetism-Luminescence

At present,there are mainly two types of anisotropic conductive films(ACFs).The type I anisotropic conductive film is conductive along the film thickness direction and insulative along the membrane surface,and has been widely used in the field of electronic industry.The type II anisotropic conductive film has different conductivity along the two vertical directions of the membrane surface and insulation along the film thickness direction,and is still in the laboratory exploration stage.The research and development of new-typed multifunctional ACFs has become one of the hot research topics in the field of electronic industry and material science.One-dimensional(1D)nanomaterials with luminescent-conductive-magnetic multi-functionalities have become one of the frontier research hotspots of multifunctional materials field.Compared with single functional materials,luminescent-conductive-magnetic multi-functional materials have broader application prospects.In this dissertation,detailed study on the two research hotspots of luminescent-conductive-magnetic multifunctional 1D nanomaterials and ACFs as well as their combinations are performed.Magnetism-luminescence functionalized two-dimensional(2D)dual-anisotropic conducting array films are prepared by electrospinning using 1D Janus nanoribbon or Janus nanofiber as building units.On this basis,the dual-anisotropic conducting array films are rolled up in different ways to obtain3D Janus-type tube and 2D plus 3D complete flag-like structure.The main research contents are as follows:1.For the first time,anisotropic electric conduction is realized by using photoconductivity phenomenon,and a new concept of photosensitive dual-anisotropic conductive Janus film(defined as PDCJF)is proposed.{[CoFe₂O₄/polyvinylidene fluoride(PVDF)/polyvinylpyrrolidone(PVP)]//[DBF/PVDF/PVP]}?{[Eu(acac)₃bipy/PVDF/PVP]//[DBF/PVDF/PVP]}top-down structured PDCJF is constructed by parallel electrospinning technology.DBF with photoconductive and luminescent properties is firstly used as conductive and luminescent material to construct PDCJF.Under light irradiation,PDCJF has photosensitive dual-anisotropic conduction,but no anisotropic conduction is observed in the absence of light illumination,so the transition from mono-functional magnetism to tri-functionalities is realized by without to with light illumination.The color-tuned luminescence and white-light emission are achieved in PDCJF by modulating luminescent substances amounts and excitation wavelength.The microscopic Janus nanofiber used as building unit and macroscopic Janus-film structure ensure high photosensitive dual-anisotropic conduction and excellent fluorescence.The 2D PDCJF is rolled up by different strategies to obtain 3D Janus-type tubes and 2D plus 3D complete flag-like structures with luminescent-conductive-magnetic functionalities.The new findings have strong guidance functions to develop advanced multi-functional nanostructures.2.For the first time,a new concept of light-stimulus responsive enhanced dual-anisotropic conductive pellicle(named as LREACP)is proposed.{[PANI/DBF/polymethyl methacrylate(PMMA)]//[CoFe₂O₄/PMMA]}?{[PANI/DBF/PMMA]//[CoFe₂O₄/PMMA]}top-down structured LREACP is constructed by using Janus nanobelt as building unit via electrospinning.In the absence of light irradiation,LREACP exhibits dual-anisotropic conduction due to PANI conduction.DBF is introduced into the conductive side of Janus nanobelt.Due to the photoconductivity of DBF,LREACP has extra photoconductivity under light illumination,so LREACP has light-stimulus responsive enhanced dual-anisotropic conduction.In the absence of light illumination,LREACP has two functions:magnetism and dual-anisotropic conduction,while in the presence of light illumination,LREACP has three functions:magnetism,fluorescence and light-stimulus responsive enhanced dual-anisotropic conduction.From without illumination to with illumination,LREACP can realize the transition from two functions to three functions and the transition from dual-anisotropic conduction to light-stimulus responsive enhanced dual-anisotropic conduction.3D and 3D plus 2D materials with novel properties are obtained by rolling 2D LREACP with different strategies,which provides a new idea for the preparation of new materials.3.{[Eu(BA)₃phen+Tb(BA)₃phen/PMMA]//[PANI/PMMA]}?{[Na YF₄:Yb³⁺,Ho³⁺/PMMA]//[PANI/PMMA]}top-bottom structured Janus array pellicle(TBJAP)is prepared by electrospinning.The luminescence and conductivity of the Janus film have been studied in detail,and the mechanism of the interaction between luminescence and conduction is clarified.By using Janus nanobelts as building units,the adverse effects between luminescent material and conductive material are reduced,and thus,TBJAP achieves excellent luminescence properties and high anisotropic conductivity.The color-tunable luminescence can be obtained by adjusting the mass ratio of Eu compound to Tb compound.Micro-partition and macro-partition are highly integrated in the TBJAP to achieve excellent multi-functions.The 3D double-walled Janus tube and 3D plus 2D complete flag-like structure are fabricated by rolling up 2D TBJAP with different strategies,which realizes the dimensional transformation from 1D Janus nanoribbon to 2D Janus pellicle then to 3D double-walled Janus tube and 3D plus 2D complete flag-like structure.