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Unravelling surface and interfacial structures of a metal–organic framework by transmission electron microscopy

Journal Article · · Nature Materials
DOI:https://doi.org/10.1038/nmat4852· OSTI ID:1379835
 [1];  [2];  [3];  [4];  [5];  [1]; ;  [1];  [1];  [1];  [1];  [5];  [1]
  1. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudia Arabia). Advanced Membranes and Porous Materials Center
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy
  3. Xi'an Univ. of Science and Technology (China). School of Materials Science and Engineering
  4. King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudia Arabia). Imaging and Characterization Core Lab.
  5. Gatan Inc., Pleasanton, CA (United States)
Metal-organic frameworks (MOFs) are crystalline porous materials with designable topology, porosity and functionality, having promising applications in gas storage and separation, ion conduction and catalysis. It is challenging to observe MOFs with transmission electron microscopy (TEM) due to the extreme instability of MOFs upon electron beam irradiation. We use a direct-detection electron-counting camera to acquire TEM images of the MOF ZIF-8 with an ultralow dose of 4.1 electrons per square ångström to retain the structural integrity. The obtained image involves structural information transferred up to 2.1 Å, allowing the resolution of individual atomic columns of Zn and organic linkers in the framework. Furthermore, TEM reveals important local structural features of ZIF-8 crystals that cannot be identified by diffraction techniques, including armchair-type surface terminations and coherent interfaces between assembled crystals. Our observations allow us to understand how ZIF-8 crystals self-assemble and the subsequent influence of interfacial cavities on mass transport of guest molecules.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1379835
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 5 Vol. 16; ISSN 1476-1122
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English

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