Construction And Properties Of Janus Nanobelts Array Membranes With Light-controllable Electrically Conductive Anisotropy

In recent years,the development of anisotropic conductive materials has aroused more and more attention of researchers.Especially,the research on type II anisotropic conductive films is considered to be a promising research topic.Photoconductive materials have important application value owing to their special property of variable electric conductivity under illumination.Single component photoconductive materials are often subject to many limitations in the preparation of devices.The composite materials prepared by photoconductive materials and organic polymer materials have both characteristics of photoconductivity and organic polymer materials,such as easy processing and flexibility.In this study,the photoconductive material and anisotropic conductive film are innovatively combined to obtain several conductive anisotropic film materials with light-controllable electrically conductive anisotropy.[PMMA/TiO₂],[PEO/TiO₂] and[PEO/PMMA/TiO₂]nanoribbons array films,and[PMMA/Cu-Pc],[PEO/Cu-Pc]and[PEO/PMMA/Cu-Pc]nanoribbons array films are prepared by electrospinning technology.The experimental results show that the above films are non-conductive in all directions under dark conditions,and their conductance in X direction can be increased under light,while insulation still remains in Y direction.Furthermore,photoconductive materials are also introduced into Janus nanoribbon array films,so as to obtain light-controllable electrically conductive anisotropy.By introducing photoconductive materials into different functional regions of Janus nanoribbons,the resulting array films can reveal different light-responsive properties.[Cu-Pc/PANI/PMMA/PEO]//[PMMA/PEO]Janus nanoribbons array films,[PANI/PMMA/PEO]//[Cu-Pc/PMMA/PEO]Janus nanoribbons array films and[TiO₂/PANI/PMMA/PEO]//[Cu-Pc/PMMA/PEO]and[Cu-Pc/PANI/PMMA/PEO]//[TiO₂/PMMA/PEO]Janus nanoribbons array films are constructed by electrospinning technique.The results show that by introducing photoconductive substances into the conductive functional region of Janus nanoribbon array films,the conductivity of the array films in the X direction can be increased under appropriate external light,while the conductivity in the Y direction is almost unchanged.In other words,light-controllable electrical conduction along X direction of Janus nanoribbon array films can be achieved.By adding photoconductive substances to the insulating region of the constructed Janus nanoribbon,Y direction of the films can be adjustable by light.Namely,the conduction along Y direction of Janus nanoribbons array films can be increased by applying appropriate external illumination compared with that under dark condition,and thus,the conductive anisotropy can be tuned down.Two kinds of photoconductive materials with different effective excitation wavelengths are respectively added into the conductive and insulating functional regions of Janus nanoribbons array films.By applying external light of different wavelengths,the conductivity of Janus nanoribbons array films in X and Y directions can be regulated separately.The research will help to provide a new route and technical support for the development of anisotropic conductive film materials and photoconductive materials,and provide a new material basis for the development of nanotechnology,nanodevices and related technical fields in the future.