Elastic films of single-crystal two-dimensional covalent organic frameworks

Yonghang Yang, Baokun Liang, Jakob Kreie, Mike Hambsch, Zihao Liang, Cheng Wang, Senhe Huang, Xin Dong, Li Gong, Chaolun Liang, Dongyang Lou, Zhipeng Zhou, Jiaxing Lu, Yang Yang, Xiaodong Zhuang, Haoyuan Qi, Ute Kaiser, Stefan C. B. Mannsfeld, Wei Liu, Armin Gölzhäuser and Zhikun Zheng ()
Additional contact information
Yonghang Yang: Sun Yat-sen University
Baokun Liang: Universität Ulm
Jakob Kreie: Bielefeld University
Mike Hambsch: Dresden University of Technology
Zihao Liang: Sun Yat-sen University
Cheng Wang: Guangdong University of Technology
Senhe Huang: Shanghai Jiao Tong University
Xin Dong: Sun Yat-sen University
Li Gong: Sun Yat-sen University
Chaolun Liang: Sun Yat-sen University
Dongyang Lou: School of Materials Science and Engineering
Zhipeng Zhou: Sun Yat-sen University
Jiaxing Lu: Sun Yat-sen University
Yang Yang: Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
Xiaodong Zhuang: Shanghai Jiao Tong University
Haoyuan Qi: Universität Ulm
Ute Kaiser: Universität Ulm
Stefan C. B. Mannsfeld: Dresden University of Technology
Wei Liu: School of Materials Science and Engineering
Armin Gölzhäuser: Bielefeld University
Zhikun Zheng: Sun Yat-sen University

Nature, 2024, vol. 630, issue 8018, 878-883

Abstract: Abstract The properties of polycrystalline materials are often dominated by defects; two-dimensional (2D) crystals can even be divided and disrupted by a line defect1–3. However, 2D crystals are often required to be processed into films, which are inevitably polycrystalline and contain numerous grain boundaries, and therefore are brittle and fragile, hindering application in flexible electronics, optoelectronics and separation1–4. Moreover, similar to glass, wood and plastics, they suffer from trade-off effects between mechanical strength and toughness5,6. Here we report a method to produce highly strong, tough and elastic films of an emerging class of 2D crystals: 2D covalent organic frameworks (COFs) composed of single-crystal domains connected by an interwoven grain boundary on water surface using an aliphatic bi-amine as a sacrificial go-between. Films of two 2D COFs have been demonstrated, which show Young’s moduli and breaking strengths of 56.7 ± 7.4 GPa and 73.4 ± 11.6 GPa, and 82.2 ± 9.1 N m−1 and 29.5 ± 7.2 N m−1, respectively. We predict that the sacrificial go-between guided synthesis method and the interwoven grain boundary will inspire grain boundary engineering of various polycrystalline materials, endowing them with new properties, enhancing their current applications and paving the way for new applications.

Date: 2024
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DOI: 10.1038/s41586-024-07505-x

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