Multiple anisotropic conductions, up/down conversion luminescence and magnetism assembled into 2D step-like Janus array film

A novel 2D dual-layer step-like Janus array film (DSJAF) based on 1D Janus nanoribbon and Janus microfiber as structural units is devised and fabricated by combining conjugate with parallel electrospinning. In DSJAF, the top-layer Janus nanoribbon array film covers the left half of the bottom-layer Janus microfiber array film and the two films bind together to form the step-like composite film, achieving two sets of Janus structures, respectively, from top to bottom on the left half of the DSJAF and from left to right on the top surface of the DSJAF. The specially structured DSJAF exhibits two sets of double anisotropic conduction coming from the two sets of Janus structures, and single anisotropic conduction exists, respectively, in the top-layer film and bottom-layer film, realizing multiple anisotropic conductions. The conductive anisotropic degree of DSJAF is modulated by diverse structural units of Janus microfiber and Janus nanoribbon. Up-conversion luminescence (UCL) and down-conversion luminescence (DCL) are concurrently acquired in DSJAF. The exceptive structure of 2D DSJAF achieves the macroscopic partition, Janus nanoribbon and Janus microfiber used as building units realize micro-partition, and the high integration of micro-partition with macro-partition is actualized in the 2D DSJAF. These partitioned structures help to reduce mutual adverse influences among raw materials to obtain splendid multifunctionality of multiple anisotropic conductions, enhanced UCL and DCL and tunable magnetism.