Atomic Spatial and Temporal Imaging of Local Structures and Light Elements inside Zeolite Frameworks.
KAUST DepartmentChemical Science Program
Advanced Membranes and Porous Materials Research Center
Physical Sciences and Engineering (PSE) Division
Online Publication Date2019-11-29
Print Publication Date2020-01
Embargo End Date2020-11-30
Permanent link to this recordhttp://hdl.handle.net/10754/660489
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AbstractIdentifying the atomic structures of porous materials in spatial and temporal dimensions by (scanning) transmission electron microscope ((S)TEM) is significant for their wide applications in catalysis, separation and energy storage. However, the sensitivity of materials to electron beams made it difficult to reduce the electron damage to specimens while maintaining the resolution and signal-to-noise ratio. It is therefore still challenging to capture multiple images of the same area in one crystal to image the temporal changes of lattices. Usings integrated differential phase contrast (iDPC) STEM, atomic-resolution imaging of beam-sensitive zeolite frameworks is achieved with an ultralow dose of 40 e- Å-2 , 2-3 orders of magnitude lower than that of conventional STEM. Based on the iDPC technique, not only the atomic 3D architecture of ZSM-5 crystals but also the changes of frameworks are observed during in situ experiments. Local structures and light-element aromatics in ZSM-5 crystals can also be revealed directly under iDPC-STEM. These results provided not only an efficient tool to image beam-sensitive materials with ultralow beam current but also a new strategy to observe and investigate the hydrocarbon pools in zeolite catalysts at the single-molecule scale.
CitationShen, B., Chen, X., Cai, D., Xiong, H., Liu, X., Meng, C., … Wei, F. (2019). Atomic Spatial and Temporal Imaging of Local Structures and Light Elements inside Zeolite Frameworks. Advanced Materials, 1906103. doi:10.1002/adma.201906103
SponsorsThis work was supported by the National Basic Research Program of China (973 Program, 2011CB932602) and the National Natural Science Foundation of China (Nos. 20141301065, 21306103, 21771029, and 21573034).