Assembly Of Anisotropic Electrically Conductive Flexible Sandwich-structured Composite Membrane Functionalized By Magnetism And Photoluminescence

In recent years,anisotropic conductive films（ACFs）have been widely used in high-tech fields such as liquid crystal display,memory,optical couplers and electronic sensors due to their many superior properties.At present,researchers have designed and constructed several types of ACFs.Type I ACFs are conductive along film thickness and insulated along film surface.This type of ACFs has been widely used in electronic equipments.Several other types of ACFs are in the process of laboratory research and have not been industrialized.Therefore,the design and construction of new-typed ACFs is a meaningful topic of research.Based on ACFs,the peculiar sandwich-structured composite film was constructed.The composite film equipped with electrically conductive anisotropy,magnetism and photoluminescence.Four kinds of sandwich-structured composite films were prepared via layer-by-layer electrospinning technology,including[PANI/PMMA]//[PMMA]Janus nanobelt array&[Fe₃O₄/PVP]&[Eu（BA）₃phen/PAN]red fluorescence sandwich-structured compositefilm,[PANI/PMMA]//[PMMA]Janusnanobeltarray&[Fe₃O₄/PVP]&[Tb（BA）₃phen/PAN]green fluorescence sandwich-structured composite film,[PANI/PMMA]//[Eu（BA）₃phen/PMMA]Janusnanobeltarray&[Fe₃O₄/PVP]&[Tb（BA）₃phen/PAN]dual-color fluorescence sandwich-structured composite film and{[PANI/PMMA]//[Tb（BA）₃phen/PMMA]Janus nanobelt array}?{[PANI/PMMA]//[Tb（BA）₃phen/PMMA]Janusnanobeltarray}&[Fe₃O₄/PVP]&[PANI/PMMA]//[Eu（BA）₃phen/PMMA]Janus nanobelt array dual-color fluorescence sandwich-structured composite film.Extensive studies have shown that dark-colored conductive materials and magnetic materials can seriously weaken the fluorescence intensity of rare earth luminescent materials.The unique sandwich structure designed in this thesis can solve this problem very well.Macroscopically,the sandwich-structured composite film has three independent functional partitions,which can effectively separate the luminescent material from the conductive material and the magnetic material.In addition,the Janus nanobelt in the anisotropic conductive layer has two micro-partitions,one side is composed of conductive materials and the other side consists of insulating materials.This unique micro-partition can ensure that the composite film has high conductive anisotropy.A series of modern analytical methods were used to characterize the samples.The results reveal that width of nanobelts in conductive layer ranges from 6μm to 11μm,the diameter of nanofibers in magnetic layer is from 300 nm to 600 nm,and the diameter of nanofibers in fluorescent layer ranges from 500 nm to 700 nm.The sandwich-structured composite film has excellent conductive anisotropy,the conductance ratio reaches 10⁸ times between conductive and insulating orientation of the sandwich-structured composite film.Moreover,the composite film also possesses excellent magnetic and fluorescent properties.More importantly,this academic idea and manufacturing means will provide support for the design and preparation of other new multifunctional anisotropic conductive materials.