首页|Cryo-EM combined with image deconvolution to determine ZIF-8 crystal structure
Cryo-EM combined with image deconvolution to determine ZIF-8 crystal structure
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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 1.7 Å and enhancing its critical electron dose to around 20 e-/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.
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
Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
Beijing Branch of Songshan Lake Materials Laboratory,Dongguan 523808,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
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