King Abdullah University of Science and Technology, KAUST Catalysis Center, Advanced Catalytic Materials, Thuwal, 23955, Saudi Arabia.
Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands.
Adv Mater. 2018 Jun;30(26):e1707234. doi: 10.1002/adma.201707234. Epub 2018 May 17.
During the last decade, the synthesis and application of metal-organic framework (MOF) nanosheets has received growing interest, showing unique performances for different technological applications. Despite the potential of this type of nanolamellar materials, the synthetic routes developed so far are restricted to MOFs possessing layered structures, limiting further development in this field. Here, a bottom-up surfactant-assisted synthetic approach is presented for the fabrication of nanosheets of various nonlayered MOFs, broadening the scope of MOF nanosheets application. Surfactant-assisted preorganization of the metallic precursor prior to MOF synthesis enables the manufacture of nonlayered Al-containing MOF lamellae. These MOF nanosheets are shown to exhibit a superior performance over other crystal morphologies for both chemical sensing and gas separation. As revealed by electron microscopy and diffraction, this superior performance arises from the shorter diffusion pathway in the MOF nanosheets, whose 1D channels are oriented along the shortest particle dimension.
在过去的十年中，金属有机骨架（MOF）纳米片的合成与应用引起了越来越多的关注，其在不同的技术应用中展现出了独特的性能。尽管这类纳米层状材料具有很大的潜力，但迄今为止开发的合成途径仅限于具有层状结构的 MOF，这限制了该领域的进一步发展。在此，提出了一种自下而上的表面活性剂辅助合成方法，用于制备各种非层状 MOF 的纳米片，拓宽了 MOF 纳米片应用的范围。在 MOF 合成之前，通过表面活性剂辅助对金属前驱体进行预组织，从而能够制造出非层状含 Al 的 MOF 薄片。研究表明，对于化学传感和气体分离，这些 MOF 纳米片的性能优于其他晶体形态。通过电子显微镜和衍射发现，这种优越的性能源于 MOF 纳米片中较短的扩散途径，其 1D 通道沿最短的颗粒尺寸取向。
