Sandwich-shape composite film displaying conductive aeolotropy, magnetism and fluorescence and derived 3D tri-wall tube

Novel two-dimensional (2D) sandwich-shape composite film (SSCF) with multi-function was successfully prepared by adopting electrospinning technology. The SSCF is composed of three layers. The first layer is double aeolotropic conductive-green fluorescent layer composed of Janus nanoribbons array, the second layer is magnetic nanofibers non-array layer, the third layer is aeolotropic conductive-red fluorescent layer consisted of Janus nanoribbons array, and the three layers are closely bonded together to obtain the SSCF. By means of the distinctive sandwich-shape structure, the three layers show different functions separately. Because Janus nanoribbon special structure is the building unit for the first and third layers, the conductance ratios between two vertical directions of the first and third layers can reach 10(8) time. Under the excitation of ultraviolet light, remarkable green emission at 545 nm and red emission at 615 nm can be obviously observed in the first and third layers, respectively. Moreover, owing to the unique sandwich shape, the properties of each layer are independent, and the fluorescence property of the first and third layers is almost unaffected by the variation of Fe3O4 NPs content of the second layer. The prepared 2D SSCF can be curled in four different ways to obtain totally new four kinds of 3D tri-wall tubes. The novel 3D tri-wall tubes possess the same outstanding performances as the 2D SSCF. The high integration of the peculiar 2D SSCF and 3D tri-wall tube with simultaneous tri-functionality is successfully actualized. More importantly, macrocosmic partition and microcosmic partition are concurrently used to construct SSCF and 3D tri-wall tube. Therefore, the novel manufacturing means can be popularized to assemble various three functions to realize multi-functionalization without mutual interferences among mono-function. Graphic abstract

Automated summary

A novel two-dimensional sandwich-shape composite film with multi-functionality was successfully prepared using electrospinning technology. The film consists of three layers with different functions, and the unique sandwich structure allows for independent properties of each layer.