Superprotonic Conductivity in a Highly Oriented Crystalline Metal–Organic Framework Nanofilm

The electrical properties of a highly oriented crystalline MOF nanofilm were studied. This nanofilm has low activation energy and a proton conductivity that is among the highest value reported for MOF materials. The study uncovered the reasons for the excellent performance of this nanofilm and revealed a new pathway for proton transport in MOF materials; besides the channels inside a MOF, the surface of the MOF nanocrystal can also dominate proton transport

Facile “Modular Assembly” for Fast Construction of a Highly Oriented Crystalline MOF Nanofilm

The preparation of crystalline, ordered thin films of metal–organic frameworks (MOFs) will be a critical process for MOF-based nanodevices in the future. MOF thin films with perfect orientation and excellent crystallinity were formed with novel nanosheet-structured components, Cu–TCPP [TCPP = 5,10,15,20-tetrakis­(4-carboxyphenyl)­porphyrin], by a new “modular assembly” strategy. The modular assembly process involves two steps: a “modularization” step is used to synthesize highly crystalline “modules” with a nanosized structure that can be conveniently assembled into a thin film in the following “assembly” step. With this method, MOF thin films can easily be set up on different substrates at very high speed with controllable thickness. This new approach also enabled us to prepare highly oriented crystalline thin films of MOFs that cannot be prepared in thin-film form by traditional techniques

Facile “Modular Assembly” for Fast Construction of a Highly Oriented Crystalline MOF Nanofilm

The preparation of crystalline, ordered thin films of metal–organic frameworks (MOFs) will be a critical process for MOF-based nanodevices in the future. MOF thin films with perfect orientation and excellent crystallinity were formed with novel nanosheet-structured components, Cu–TCPP [TCPP = 5,10,15,20-tetrakis­(4-carboxyphenyl)­porphyrin], by a new “modular assembly” strategy. The modular assembly process involves two steps: a “modularization” step is used to synthesize highly crystalline “modules” with a nanosized structure that can be conveniently assembled into a thin film in the following “assembly” step. With this method, MOF thin films can easily be set up on different substrates at very high speed with controllable thickness. This new approach also enabled us to prepare highly oriented crystalline thin films of MOFs that cannot be prepared in thin-film form by traditional techniques

Fabrication and Structural Characterization of an Ultrathin Film of a Two-Dimensional-Layered Metal–Organic Framework, {Fe(py)₂[Ni(CN)₄]} (py = pyridine)

We report the fabrication and characterization of the first example of a tetracyanonickelate-based two-dimensional-layered metal–organic framework, {Fe­(py)₂Ni­(CN)₄} (py = pyridine), thin film. To fabricate a nanometer-sized thin film, we utilized the layer-by-layer method, whereby a substrate was alternately soaked in solutions of the structural components. Surface X-ray studies revealed that the fabricated film was crystalline with well-controlled growth directions both parallel and perpendicular to the substrate. In addition, lattice parameter analysis indicated that the crystal system is found to be close to higher symmetry by being downsized to a thin film