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Rapid Generation of Hierarchically Porous Metal–Organic Frameworks through Laser Photolysis
Author(s) -
Wang KunYu,
Feng Liang,
Yan TianHao,
Wu Shengxiang,
Joseph Elizabeth A.,
Zhou HongCai
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202003636
Subject(s) - microporous material , metal organic framework , mesoporous material , nanotechnology , materials science , porosity , lithography , linker , crystallinity , oxide , chemical engineering , catalysis , chemistry , organic chemistry , optoelectronics , computer science , composite material , adsorption , engineering , metallurgy , operating system
Abstract Hierarchically porous metal–organic frameworks (HP‐MOFs) facilitate mass transfer due to mesoporosity while preserving the advantage of microporosity. This unique feature endows HP‐MOFs with remarkable application potential in multiple fields. Recently, new methods such as linker labilization for the construction of HP‐MOFs have emerged. To further enrich the synthetic toolkit of MOFs, we report a controlled photolytic removal of linkers to create mesopores within microporous MOFs at tens of milliseconds. Ultraviolet (UV) laser has been applied to eliminate “photolabile” linkers without affecting the overall crystallinity and integrity of the original framework. Presumably, the creation of mesopores can be attributed to the missing‐cluster defects, which can be tuned through varying the time of laser exposure and ratio of photolabile/robust linkers. Upon laser exposure, MOF crystals shrank while metal oxide nanoparticles formed giving rise to the HP‐MOFs. In addition, photolysis can also be utilized for the fabrication of complicated patterns with high precision, paving the way towards MOF lithography, which has enormous potential in sensing and catalysis.