Stassin, Timothée; Stassen, Ivo; Marreiros, João; Cruz, Alexander John; Verbeke, Rhea; Tu, Min; Reinsch, Helge; Dickmann, Marcel; Egger, Werner; Vankelecom, Ivo F. J.; De Vos, Dirk E.; Ameloot, Rob
Dokumenttyp:
Zeitschriftenartikel / Journal Article
Titel:
Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Large-Pore Metal–Organic Framework MAF-6
Zeitschrift:
Chemistry of Materials
Jahrgang:
32
Heftnummer:
5
Jahr:
2020
Seiten von - bis:
1784-1793
Sprache:
Englisch
Abstract:
A simple solvent- and catalyst-free method is presented for the synthesis of the large-pore metal–organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, crystalline films of a large-pore material could be deposited for the first time entirely from the vapor phase. A combination of positron annihilation lifetime spectroscopy (PALS) and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diameter ∼2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), pair distribution function (PDF), and extended X-ray absorption fine structure (EXAFS). The exceptional uptake capacity of MAF-6 in comparison to ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows. «
A simple solvent- and catalyst-free method is presented for the synthesis of the large-pore metal–organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, crystalline films of a large-pore material could be deposited for the first time entirely from the vapor phase. A combination of positron annihilation lifetime spectroscopy (PALS) and Kr physisorption... »