Wednesday, 21 August 2024

New findings provide basis for innovative material development

yellow, white, gray and blue spheres that are connected to each other ©University of Graz/Brandstetter

MOFs (metal-organic frameworks) are microporous materials made up of layers of inorganic building blocks connected by organic molecules. Graphic: Uni Graz/Brandstetter

If we strive for ever thinner materials, we eventually reach the two-dimensional (2D) limit, where the material is only a few atoms or even just one atom thin. These materials acquire unique mechanical, electronic and optical properties that hold great potential for innovative technologies, for example for energy conversion and storage. Physicists from the University of Graz and Forschungszentrum Jülich have now achieved a breakthrough in the development and characterisation of so-called 2D-MOFs, a special type of two-dimensional material. The scientists published their results in the renowned journals ACS Nano and Advanced Science.

2D MOFs consist of metal atoms connected by organic, i.e. carbon-based, molecules. They therefore combine the best of both worlds: Properties of metals and organic materials. This makes them a beacon of hope for a wide range of future technologies that could make electronic devices smaller, smarter and more efficient.

Physicists from the University of Graz and Forschungszentrum Jülich jointly found direct evidence of how the hierarchical arrangement of transition metals and organic connecting elements, so-called linkers, creates band structures in the 2D MOF lattice. In addition, the research demonstrates the associated multifunctional electronic and magnetic properties of the materials.

"The results of our two studies offer a new perspective on how electronic band structures in 2D MOFs can be tailored and pave the way for the integration of these materials into future electronic and photonic devices," says Peter Puschnig, emphasising the significance of the publication. The head of the "Electronic Structure of Nanomaterials" working group at the Department of Physics at the University of Graz was responsible for the theoretical investigations in the project together with Dominik Brandstetter and Andreas Windischbacher. Colleagues from Forschungszentrum Jülich carried out the experiments.

Publications:

Emergence of Band Structure in a Two-Dimensional Metal-Organic Framework upon Hierarchical Self-Assembly
D. Baranowski, M. Thaler, D. Brandstetter, A. Windischbacher, I. Cojocariu, S. Mearini, V. Chesnyak, L. Schio, L. Floreano, C. Gutiérrez Bolaños, P. Puschnig, L.L. Patera, V. Feyer, C.M. Schneider, ACS Nano, 18 (30), 19618-19627 (2024)
https://doi.org/10.1021/acsnano.4c04191

Band Structure Engineering in 2D Metal-Organic Frameworks
S. Mearini, D. Baranowski, D. Brandstetter, A. Windischbacher, I. Cojocariu, P. Gargiani, M. Valvidares, L. Schio, L. Floreano, P. Puschnig, V. Feyer and C.M. Schneider, Adv. Sci. (2024) 2404667
https://doi.org/10.1002/advs.202404667

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