Electrospun Anisotropic Photoconductivitymagnetic-fluorescent Switch-typed 3D or 3D Plus 2D Structures

New three-dimensional (3D) and 3D plus two- dimensional (2D) structures with anisotropic photoconductivity, magnetism, and fluorescence are prepared. Firstly, a switch-typed anisotropic photo-conductive Janus film (S-JF) is prepared by electrospinning, and the target structures are obtained by rolling 2DS-JF using different rolling strategies. Using [high concentration DF(H-DF)/polyvinyl pyrrolidone (PVP)]/polyvinylidene fluoride (PVDF)//[PVDF/Fe
3
O
4
/PVP] Janus nanofibers and [low concentration DF(L-DF)/polymethyl methacrylate (PMMA)] nanobelts as construction units, the top and bottom layers of S- JF are constructed, respectively. In the absence of light irradiation, the 3D and 3D plus 2D structures only exhibit magnetism. Under ultraviolet light irradiation, due to the photo-conductive effect of DF, the sample conducts electricity along the direction in which the Janus nanofibers are arranged, and due to the introduction of the insulating part into Janus nanofibers, it is insulated in the perpendicular direction to the Janus nanofibers, resulting in conductivity anisotropy of the sample. At the same time, the two layers of S-JF have different fluorescence colors. Therefore, under light stimulation, the 3D and 3D plus 2D structures exhibit three properties: fluorescence, anisotropic conductivity and magnetism, which means that 3D and 3D plus 2D structures achieve the transition from single function to triple function through no light irradiation to light irradiation.