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Stability of monolithic mof thin films in acidic and alkaline aqueous media

Hashem, Tawheed; Valadez Sanchez, Elvia P.; Bogdanova, Evgenia; Ugodchikova, Anna; Mohamed, Alaa; Schwotzer, Matthias; Alkordi, Mohamed H.; Wöll, Christof

Abstract:
In the context of thin film nanotechnologies, metal-organic frameworks (MOFs) are currently intensively explored in the context of both, novel applications and as alternatives to existing materials. When it comes to applications under relatively harsh conditions, in several cases it has been noticed that the stability of MOF thin films deviates from the corresponding standard, powdery form of MOFs. Here, we subjected SURMOFs, surface-anchored MOF thin films, fabricated using layer-by layer methods, to a thorough characterization after exposure to different harsh aqueous environments. The stability of three prototypal SURMOFs, HKUST-1, ZIF-8, and UiO-66-NH2 was systematically investigated in acidic, neutral, and basic environments using X-ray diffraction and electron microscopy. While HKUST-1 films were rather unstable in aqueous media, ZIF-8 SURMOFs were preserved in alkaline environments when exposed for short periods of time, but in apparent contrast to results reported in the literature for the corresponding bulk powders- not stable in neutral and acidic environments. UiO-66-NH$_{2}$ SURMOFs were found to be stable over a large window of pH values.

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Verlagsausgabe §
DOI: 10.5445/IR/1000131151
Veröffentlicht am 08.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2077-0375
KITopen-ID: 1000131151
Erschienen in Membranes
Verlag MDPI
Band 11
Heft 3
Seiten 207
Schlagwörter MOF; SURMOF; liquid phase epitaxy; layer-by-layer; pH stability
Nachgewiesen in Scopus
Web of Science
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