AI Article Synopsis

  • - Solution shearing is a coating process that efficiently creates large-area metal-organic framework (MOF) thin films, essential for applications like separations, sensing, and catalysis.
  • - The study focuses on NU-901, a zirconium-based MOF, detailing how its thin film properties (like crystallinity and thickness) vary depending on substrate temperature and linker concentration, achieving high surface coverage on smaller substrates.
  • - Additionally, the solution shearing technique is successfully applied to produce MOF-525 thin films, which have promising electrocatalytic properties, particularly in reducing CO, indicating their potential for CO capture and utilization in various applications.

Article Abstract

Solution shearing, a meniscus-guided coating process, can create large-area metal-organic framework (MOF) thin films rapidly, which can lead to the formation of uniform membranes for separations or thin films for sensing and catalysis applications. Although previous work has shown that solution shearing can render MOF thin films, examples have been limited to a few prototypical systems, such as HKUST-1, Cu-HHTP, and UiO-66. Here, we expand on the applicability of solution shearing by making thin films of NU-901, a zirconium-based MOF. We study how the NU-901 thin film properties (i.e., crystallinity, surface coverage, and thickness) can be controlled as a function of substrate temperature and linker concentration. High fractional surface coverage of small-area (∼1 cm) NU-901 thin films (0.88 ± 0.06) is achieved on a glass substrate for all conditions after one blade pass, while a low to moderate fractional surface coverage (0.73 ± 0.18) is obtained for large-area (∼5 cm) NU-901 thin films. The crystallinity of NU-901 crystals increases with temperature and decreases with linker concentration. On the other hand, the adjusted thickness of NU-901 thin films increases with both increasing temperature and linker concentration. We also extend the solution shearing technique to synthesize MOF-525 thin films on a transparent conductive oxide that are useful for electrocatalysis. We show that Fe-metalated MOF-525 films can reduce CO to CO, which has implications for CO capture and utilization. The demonstration of thin film formation of NU-901 and MOF-525 using solution shearing on a wide range of substrates will be highly useful for implementing these MOFs in sensing and catalytic applications.

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http://dx.doi.org/10.1021/acsami.3c12011DOI Listing

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