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Cryo-EM combined with image deconvolution to determine ZIF-8 crystal structure |
| Kang Wu(吴抗)1,2, Baisong Yang(杨柏松)2, Wenhua Xue(薛文华)2, Dapeng Sun(孙大鹏)2,†, Binghui Ge(葛炳辉)1,‡, and Yumei Wang(王玉梅)2,3,§ |
1 Information Materials and Intelligent Sensing Laboratory of Anhui Province, Leibniz International Joint Research Center of Materials Sciences of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Beijing Branch of Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract Metal-organic frameworks (MOFs) are crystalline porous materials with tunable properties, exhibiting great potential in gas adsorption, separation and catalysis.[1,2] It is challenging to visualize MOFs with transmission electron microscopy (TEM) due to their inherent instability under electron beam irradiation. Here, we employ cryo-electron microscopy (cryo-EM) to capture images of MOF ZIF-8, revealing inverted-space structural information at a resolution of up to about 1.7Å and enhancing its critical electron dose to around 20e-/Å2. In addition, it is confirmed by electron-beam irradiation experiments that the high voltage could effectively mitigate the radiolysis, and the structure of ZIF-8 is more stable along the [100] direction under electron beam irradiation. Meanwhile, since the high-resolution electron microscope images are modulated by contrast transfer function (CTF) and it is difficult to determine the positions corresponding to the atomic columns directly from the images. We employ image deconvolution to eliminate the impact of CTF and obtain the structural images of ZIF-8. As a result, the heavy atom Zn and the organic imidazole ring within the organic framework can be distinguished from structural images.
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Received: 29 March 2024
Revised: 06 May 2024
Accepted manuscript online:
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PACS:
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68.37.Og
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(High-resolution transmission electron microscopy (HRTEM))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.12074409 and 12374021). |
Corresponding Authors:
Dapeng Sun, Binghui Ge, Yumei Wang
E-mail: 225sundapeng@iphy.ac.cn;bhge@ahu.edu.cn;wangym@iphy.ac.cn
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Cite this article:
Kang Wu(吴抗), Baisong Yang(杨柏松), Wenhua Xue(薛文华), Dapeng Sun(孙大鹏), Binghui Ge(葛炳辉), and Yumei Wang(王玉梅) Cryo-EM combined with image deconvolution to determine ZIF-8 crystal structure 2024 Chin. Phys. B 33 076802
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