Electrospinning Construction Of Flexible Janus Nanoribbons Arrays Functionalized With Luminescence-Electricity-Magnetism Tri-functionality

In recent years,with the development of integrated and miniaturized devices,the research and applications of luminescent-conductive-magnetic multifunctional nanomaterials have received more and more attention.As for the luminescent-conductive-magnetic multifunctional materials,when the magnetic substance,conductive polymers and luminescent substance are directly mixed together,the fluorescence of the products will be greatly reduced.Therefore,it is an urgent and meaningful research topic to design and construct a new kind of special-structure Janus nanostrip with three partitions to realize the effective separation of luminescent,conductive and magnetic substance,and further to obtain multifunctional materials with excellent luminescence-conductive-magnetic properties.The detailed results are summarized as following:In this dissertation,coaxial nanobelt//nanobelt structure Janus nanostrip is designed and constructed by electrospinning technology.Janus nanostrips array is constructed by utilizing special Janus nanostrip as building units.In addition,special Janus nanostrip is used to obtain two-dimensional(2D)Janus nanostrips array.Then,neoteric three-dimensional(3D)Janus tube is obtained by adopting various rolling schemes.The morphology,structure and performance of the samples are detailedly investigated.1.{[CoFe2O4/PMMA]@[PANI/PMMA]}//[Y2O3:Yb3+,Er3+/PMMA]Janus nanostrip was fabricated via electrospinning.By using the special-structure Janus nanobelt as the construction unit and conductive unit,Janus nanostrip array with up-conversion luminescence,high anisotropic conductivity and magnetism was constructed via electrospinning.The formation mechanisms of coaxial nanobelt//nanobelt structured Janus nanostrip and its array are advanced.Special Janus nanostrip is applied to realize three functional partitions,avoiding the interaction among different functions.In addition,by changing the content of CoFe2O4 NPs and PANI respectively,adjustable magnetism and conductive anisotropy can be achieved.The conductance ratio between conductive direction and insulative direction reaches 108 times.2.Left-to-right structured {<[CoFe2O4/PMMA]@[PANI/PMMA]>//[Tb(acac)3bipy/PMMA]}丄{<[CoFe204/PMMA]@[PANI/PMMA]>//[Eu(TTA)3(TPPO)2/PMMA]} Janus nanostrips array membrane with double anisotropic conductive,red-green two-color luminescence and magnetism is prepared via electrospinning.Two kinds of luminescent substance with different luminescence characteristics are introduced into both sides of Janus nanostrips array membranes by using the left and right structures,and macro partitions is realized.The whole membrane exhibits the characteristic of red-green two-color luminescence excited by UV light.Additionally,3D Janus-structural pipe can be obtained by crimping Janus nanostrips array membranes in different ways,realizing the transition from 2D array membrane to 3D Janus pipe.3.{<[CoFe2O4/PMMA]@[PEDOT/PMMA]>//[NaYF4:Yb3+,Er3+/PMMA]}⊥{[PEDOT/PMMA]//[Tb(acac)3bipy/PMMA]} Janus nanostrips array membrane and 3D Janus tube with double anisotropic conductive,up-/down-conversion luminescence and magnetism were fabricated via electrospinning.The special structure of Janus nanostrip and the ordinary Janus nanostrip are respectively used as building unit and conductive unit to construct the left side and right side of Janus nanostrips array membrane.The left and right side films respectively exhibit up-conversion and down-conversion luminescence properties,achieving up-/down-conversion dual-mode luminescence.In addition,the magnetism,conductive anisotropy and luminescence intensity can be regulated by controlling the contents of magnetic,conductive and luminescent substance,respectively.