Metal-organic frameworks (MOFs) are highly porous, crystalline materials consisting of metal ions coordinated to organic ligands that arrange themselves in a complex, scaffold-like structure. Surface-anchored MOFs (SurMOFs) can be fabricated using a sequential, solution-phase deposition method in which the metal ions and organic molecules are alternatingly deposited on a substrate. This substrate is typically functionalized with a self-assembled monolayer that anchors the MOF structure to the surface. Utilizing an automated deposition process, we have fabricated multiple MOF types, each with the copper-paddlewheel node structure. The properties of these systems were investigated by scanning probe microscopy, infrared spectroscopy, ellipsometry, electrochemical impedance spectroscopy, and cyclic voltammetry. These techniques reveal the film growth mechanism, structure, and electrical properties. The layer-by-layer deposition method resulted in conformal film growth for two systems via a Van der Merwe growth mechanism, resulting in a smooth film morphology for both MOF types. For one of our systems, electrochemical impedance spectroscopy demonstrated low electronic conductivity hypothesized to be due to topology and density. Porosity of systems was confirmed by cyclic voltammetry methods. This fundamental research into the formation of the foundational layers of these surMOF systems is essential to develop design rules for the integration of these promising materials into real-world applications.

Investigating the physical and electrical properties of copper-paddlewheel surface-anchored metal-organic frameworks

2019 Spring National Meeting

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