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.

Highlights

• 2D step-like film with multiple Janus structures was first designed and fabricated.

• 2D step-like film can make full use of each exposed surface for specific utilization.

• 2D step-like film possesses multiple and tuned electrically conductive anisotropy.

• Film has up- and down-conversion luminescence, conductive anisotropy and magnetism.

• Film possesses anisotropic mechanical strength in the two vertical directions.

• Conductive anisotropy of step-like film can be modulated by diverse structural units.

• Macro-partition and micro-partition are concurrently realized in 2D step-like film.

• Partitioned structure assists in reducing adverse interactions among disparate materials.

• 2D step-like structured film can be used to assemble other multifunctional materials. (paper)