Ultrafast assembly of swordlike Cu3(1,3,5-benzenetricarboxylate)n metal–organic framework crystals with exposed active metal sites
| Autor: | Ninweh N Jeorje, Peter C. Sherrell, Heba Ahmed, Susan Marqus, Ahmed El Ghazaly, Xinci Yang, Amgad R. Rezk, Leslie Y. Yeo, Yemima Ehrnst, Johanna Rosen |
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| Rok vydání: | 2020 |
| Předmět: |
Solid-state chemistry
Materials science Solvothermal synthesis 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Metal Crystal Chemical physics visual_art visual_art.visual_art_medium General Materials Science Metal-organic framework Thin film 0210 nano-technology Monoclinic crystal system |
| Zdroj: | Nanoscale Horizons. 5:1050-1057 |
| ISSN: | 2055-6764 2055-6756 |
| DOI: | 10.1039/d0nh00171f |
| Popis: | Owing to their large surface area and high uptake capacity, metal-organic frameworks (MOFs) have attracted considerable attention as potential materials for gas storage, energy conversion, and electrocatalysis. Various strategies have recently been proposed to manipulate the MOF surface chemistry to facilitate exposure of the embedded metal centers at the crystal surface to allow more effective binding of target molecules to these active sites. Nevertheless, such strategies remain complex, often requiring strict control over the synthesis conditions to avoid blocking pore access, reduction in crystal quality, or even collapse of the entire crystal structure. In this work, we exploit the hydrodynamics and capillary resonance associated with acoustically-driven dynamically spreading and nebulizing thin films as a new method for ultrafast synthesis of swordlike Cu3(1,3,5-benzenetricarboxylate)n (Cu-BTC) MOFs with unique monoclinic crystal structures (P21/n) distinct to that obtained via conventional bulk solvothermal synthesis, with 'swordlike' morphologies whose lengths far exceed their thicknesses. Through pulse modulation and taking advantage of the rapid solvent evaporation associated with the high nebulisation rates, we are also able to control the thicknesses of these large aspect ratio (width and length with respect to the thickness) crystals by arresting their vertical growth, which, in turn, allows exposure of the metal active sites at the crystal surface. An upshot of such active site exposure on the crystal surface is the concomitant enhancement in the conductivity of the MOF, evident from the improvement in its current density by two orders of magnitude. |
| Databáze: | OpenAIRE |
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