Publication date: 15th December 2025
2D-AlN is a thermodynamically stable compound that has been predicted by density functional theory (DFT) calculations. It has attracted considerable attention due to its ultrawide band gap (> 2.8 eV) and its strong adsorption of CO2 (0.91 eV) molecules on its surface. This represents a breakthrough for CO2 capture technologies because the adsorption of gases directly on the 2D-AlN nanosheets is a simple and sustainable alternative for replacing the current strategy of decorating carbon nanostructure with metal nanoparticles for gas storage and CO2 capture. In addition, the high adsorption CO2 selectivity in comparison with other gases such as CO, H2, N2, O2, and NO (<0.5 eV) opens other potential applications like gas separation membranes and gas sensors, among others. The DFT calculations have put 2D-AlN in the spotlight, but so far, the synthesis of free-standing 2D-AlN layers have not yet been achieved.
In this work I will present a new strategy to synthesize 2D-AlN nanoflakes for the first time. First, I will introduce the precursor materials including their characterization and properties. Then, I will continue with the different approaches for the synthesis of the 2D nanoflakes and their main characteristics. Afterwards, I will present the preliminary characterization of these new 2D materials as well as their main applications.
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