Direct Imaging of Tunable Crystal Surface Structures of MOF MIL-101 Using High-Resolution Electron Microscopy

Xinghua Li, Jianjian Wang, Xin Liu, Lingmei Liu, Dongkyu Cha, Xinliang Zheng, Ali A. Yousef, Kepeng Song, Yihan Zhu, Daliang Zhang, Yu Han

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Metal–organic frameworks (MOFs) are often synthesized using various additives to modulate the crystallization. Here, we report the direct imaging of the crystal surface of MOF MIL-101 synthesized with different additives, using low-dose high-resolution transmission electron microscopy (HRTEM), and identify three distinct surface structures, at subunit cell resolution. We find that the mesoporous cages at the outermost surface of MIL-101 can be opened up by vacuum heating treatment at different temperatures, depending on the MIL-101 samples. We monitor the structural evolution of MIL-101 upon vacuum heating, using in situ X-ray diffraction, and find the results to be in good agreement with HRTEM observations, which leads us to speculate that additives have an influence not only on the surface structure but also on the stability of framework. In addition, we observe solid–solid phase transformation from MIL-101 to MIL-53 taking place in the sample synthesized with hydrofluoric acid.
Original languageEnglish (US)
Pages (from-to)12021-12028
Number of pages8
JournalJournal of the American Chemical Society
Volume141
Issue number30
DOIs
StatePublished - Jul 19 2019

Fingerprint Dive into the research topics of 'Direct Imaging of Tunable Crystal Surface Structures of MOF MIL-101 Using High-Resolution Electron Microscopy'. Together they form a unique fingerprint.

Cite this