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Nano Research 2020, 13(11): 3151-3156 https://doi.org/10.1007/s12274-020-2986-3
Research Article | Issue | Published: 25 August 2020

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

Show Author's Information 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
Keywords:
two-dimensional (2D) materials, metal-organic frameworks, metal-organic layers, solvothermal synthesis, surface structure
Topics:
Atomic force microscopyCrystal atomic structureHigh resolution transmission electron microscopyLigands MonolayersOrganometallicsSurface structure
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
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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information 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

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: two-dimensional (2D) materials, metal-organic frameworks, metal-organic layers, solvothermal synthesis, surface structure

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Publication history
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Acknowledgements

Publication history

Received: 30 April 2020
Revised: 30 June 2020
Accepted: 13 July 2020
Published: 25 August 2020
Issue date: November 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

We acknowledge funding support from the Ministry of Science and Technology of China (No. 2016YFA0200702), the National Natural Science Foundation of China (No. 21671162 and No. 21721001), the XMU Training Program of Innovation and Entrepreneurship for Undergraduates and NFFTBS (No. J1310024). We thank Zhe Li and Rongkun Lin from Xiamen University for experimental support, and Bingjie Wang, Anna Carisson from Thermo Fischer Scientific for TEM imaging.

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