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Growth of MOFs on functionalized Si surfaces

par Anne-Marie - publié le

MOFs (Metal Organic Frameworks) are crystalline hybrid materials obtained by assembling metal ions and organic ligands. These materials have great potential for many applications due to their high porosity (specific surface area typically between 1000 and 10000 m2/g) greater than that of inorganic porous materials and their structural (pore size and shape) and physical properties. -chemical, adjustable by the choice of precursors. In the laboratory, the Electrochemistry and Thin Films team is interested in producing MOF thin films by direct growth on silicon surfaces. Work begun as part of Hongye Yuan’s thesis (2017) and continued as part of Weichu Fu’s thesis (in progress) has just been published in Chemistry - an Asian Journal. [1]

The growth of MOFs based on Fe and carboxylate ligands was studied on silicon surfaces previously functionalized by grafting an organic monolayer, according to methods previously developed in the team. The results show the co-nucleation and growth of different crystal phases and different layer morphologies : greater or lesser density of crystallites with specific orientations or poly-crystalline continuous layers. The structural properties of the different phases could be determined from characterizations by scanning electron microscopy (SEM) or atomic force microscopy (AFM), combined with analyzes by X-Ray Diffraction (XRD). A particularly interesting and novel result is the demonstration of the growth of textured ultrathin layers (≤ 50 nm) presenting extended single-crystal domains and of 2D nanoparticles a few nanometers thick also textured, the nature of which could be determined thanks to high-resolution AFM imagery.

[[1] Growth of Fe-BDC Metal-Organic Frameworks onto Functionalized Si (111) Surfaces, H. Yuan, W. Fu, N. Soulmi, C. Serre, N. Steunou, M. Rosso and C. Henry de Villeneuve, Chem. Asian J., 2022