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Research Article

Probing surface structure on two-dimensional metal-organic layers to understand suppressed interlayer packing

Peican Chen1, Yi Liu1, Xuefu Hu1, Xiaolin Liu1, En-Ming You1, Xudong Qian1, Jiawei Chen1, Liangping Xiao1, Lingyun Cao1, Xinxing Peng1, Zhongming Zeng1, Yibing Jiang1, Song-Yuan Ding1, Honggang Liao1, Zhaohui Wang1, Da Zhou2, Cheng Wang1( )
IChem, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
School of Mathematical Sciences and Fujian Provincial Key Laboratory of Mathematical Modeling and High-Performance Scientific Computation, Xiamen University, Xiamen 361005, China
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Abstract

Two-dimensional metal-organic layers (MOLs) from alternatively connected benzene-tribenzoate ligands and Zr6(µ3-O)4(µ3-OH)4 or Hf6(µ3-O)4(µ3-OH)4 secondary building units can be prepared in gram scale via solvothermal synthesis. However, the reason why the monolayers did not pack to form thick crystals is unknown. Here we investigated the surface structure of the MOLs by a combination of sum-frequency generation spectroscopy, nanoscale infrared microscopy, atomic force microscopy, aberration- corrected transmission electron microscopy, and compositional analysis. We found a partial coverage of the monolayer surface by dangling tricarboxylate ligands, which prevent packing of the monolayers. This finding illustrates low-density surface modification as a strategy to prepare new two-dimensional materials with a high percentage of exposed surface.

Keywords

metal-organic frameworksmetal-organic layerssurface structuretwo-dimensional (2D) materialssolvothermal synthesis

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 3151-3156
DOI: 10.1007/s12274-020-2986-3
Cite this article:
Chen P, Liu Y, Hu X, et al. Probing surface structure on two-dimensional metal-organic layers to understand suppressed interlayer packing. Nano Research, 2020, 13(11): 3151-3156. https://doi.org/10.1007/s12274-020-2986-3
Topics:
Atomic force microscopyCrystal atomic structureHigh resolution transmission electron microscopyLigands MonolayersOrganometallicsSurface structure

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Received: 30 April 2020
Revised: 30 June 2020
Accepted: 13 July 2020
Published: 25 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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