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Stability and Degradation of Metal–Organic-Framework Films under Ambient Air Explored by Uptake and Diffusion Experiments

Li, Chun; Chandresh, Abhinav; Zhang, Zejun; Moulai, Sarah; Heinke, Lars

Abstract:

The loading with guest molecules is the key feature for most applications of metal–organic frameworks (MOFs). The limited stability of MOFs against environmental factors, like humid air, is often a severe problem which hinders real-life applications. Here, the stability of four common MOFs, UiO-66, UiO-67, HKUST-1, and ZIF-8, under long-term exposure to humid air and under exposure to water vapor is explored. Transient uptake experiments with toluene and other volatile organic compounds as probe molecules are combined with structural investigations via X-ray diffraction and infrared spectroscopy. In line with previous publications showing the structural stability of ZIF-8 and UiO-66, it is found that its uptake properties are not affected by exposure to air. On the other hand, HKUST-1 shows clear structural decomposition in air and degradation of the uptake properties. Unexpectedly, while the diffraction and spectroscopy data of UiO-67 do not suggest a corrosion of the structure upon air exposure, the guest-loading data show a strong decrease of the uptake amount and a deceleration of the uptake rate. Both features strongly indicate the formation of surface barriers for the mass transfer in UiO-67, like in HKUST-1. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000141137
Veröffentlicht am 15.12.2021
Originalveröffentlichung
DOI: 10.1002/admi.202101947
Scopus
Zitationen: 19
Web of Science
Zitationen: 17
Dimensions
Zitationen: 17
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2196-7350
KITopen-ID: 1000141137
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Advanced Materials Interfaces
Verlag John Wiley and Sons
Band 9
Heft 3
Seiten Art.-Nr.: 2101947
Vorab online veröffentlicht am 04.12.2021
Nachgewiesen in Scopus
Dimensions
Web of Science
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