Imaging the node-linker coordination in the bulk and local structures of metal-organic frameworks

Boyuan Shen, Xiao Chen (), Kui Shen, Hao Xiong and Fei Wei ()
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Boyuan Shen: Tsinghua University
Xiao Chen: Tsinghua University
Kui Shen: South China University of Technology
Hao Xiong: Tsinghua University
Fei Wei: Tsinghua University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Porous metal-organic frameworks (MOFs) have shown wide applications in catalysis, gas storage and separation due to their highly tunable porosity, connectivity and local structures. However, the electron-beam sensitivity of MOFs makes it difficult to achieve the atomic imaging of their bulk and local structures under (scanning) transmission electron microscopy ((S)TEM) to study their structure-property relations. Here, we report the low-dose imaging of a beam-sensitive MOF, MIL-101, under a Cs-corrected STEM based on the integrated differential phase contrast (iDPC) technique. The images resolve the coordination of Cr nodes and organic linkers inside the frameworks with an information transfer of ~1.8Å. The local structures in MIL-101 are also revealed under iDPC-STEM, including the surfaces, interfaces and defects. These results provide an extensible method to image various beam-sensitive materials with ultrahigh resolution, and unravel the whole framework architectures for further defect and surface engineering of MOFs towards tailored functions.

Date: 2020
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DOI: 10.1038/s41467-020-16531-y

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