Large-area synthesis of nanoscopic catalyst-decorated conductive MOF film using microfluidic-based solution shearing

Jin-Oh Kim, Won-Tae Koo, Hanul Kim, Chungseong Park, Taehoon Lee, Calvin Andreas Hutomo, Siyoung Q. Choi, Dong Soo Kim, Il-Doo Kim () and Steve Park ()
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Jin-Oh Kim: Korea Advanced Institute of Science and Technology (KAIST)
Won-Tae Koo: Korea Advanced Institute of Science and Technology (KAIST)
Hanul Kim: Korea Advanced Institute of Science and Technology (KAIST)
Chungseong Park: Korea Advanced Institute of Science and Technology (KAIST)
Taehoon Lee: Korea Advanced Institute of Science and Technology (KAIST)
Calvin Andreas Hutomo: Korea Advanced Institute of Science and Technology (KAIST)
Siyoung Q. Choi: Korea Advanced Institute of Science and Technology (KAIST)
Dong Soo Kim: Hanbat National University
Il-Doo Kim: Korea Advanced Institute of Science and Technology (KAIST)
Steve Park: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Conductive metal-organic framework (C-MOF) thin-films have a wide variety of potential applications in the field of electronics, sensors, and energy devices. The immobilization of various functional species within the pores of C-MOFs can further improve the performance and extend the potential applications of C-MOFs thin films. However, developing facile and scalable synthesis of high quality ultra-thin C-MOFs while simultaneously immobilizing functional species within the MOF pores remains challenging. Here, we develop microfluidic channel-embedded solution-shearing (MiCS) for ultra-fast (≤5 mm/s) and large-area synthesis of high quality nanocatalyst-embedded C-MOF thin films with thickness controllability down to tens of nanometers. The MiCS method synthesizes nanoscopic catalyst-embedded C-MOF particles within the microfluidic channels, and simultaneously grows catalyst-embedded C-MOF thin-film uniformly over a large area using solution shearing. The thin film displays high nitrogen dioxide (NO2) sensing properties at room temperature in air amongst two-dimensional materials, owing to the high surface area and porosity of the ultra-thin C-MOFs, and the catalytic activity of the nanoscopic catalysts embedded in the C-MOFs. Therefore, our method, i.e. MiCS, can provide an efficient way to fabricate highly active and conductive porous materials for various applications.

Date: 2021
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DOI: 10.1038/s41467-021-24571-1

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