On-water surface synthesis of crystalline, few-layer two-dimensional polymers assisted by surfactant monolayers

Kejun Liu, Haoyuan Qi, Renhao Dong, Rishi Shivhare, Matthew Addicoat, Tao Zhang, Hafeesudeen Sahabudeen, Thomas Heine, Stefan Mannsfeld, Ute Kaiser, Zhikun Zheng, Xinliang Feng

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19 Citations (Scopus)

Abstract

Despite rapid progress in recent years, it has remained challenging to prepare crystalline two-dimensional polymers. Here, we report the controlled synthesis of few-layer two-dimensional polyimide crystals on the surface of water through reaction between amine and anhydride monomers, assisted by surfactant monolayers. We obtained polymers with high crystallinity, thickness of ~2 nm and an average crystal domain size of ~3.5 μm2. The molecular structure of the materials, their grain boundaries and their edge structures were characterized using X-ray scattering and transmission electron microscopy techniques. These characterizations were supported by computations. The formation of crystalline polymers is attributed to the pre-organization of monomers at the water–surfactant interface. The surfactant, depending on its polar head, promoted the arrangement of the monomers—and in turn their polymerization—either horizontally or vertically with respect to the water surface. The latter was observed with a surfactant bearing a carboxylic acid group, which anchored amine monomers vertically through a condensation reaction. In both instances, micrometre-sized, few-layer two-dimensional polyamide crystals were grown.

Original languageEnglish
Pages (from-to)994-1000
Number of pages7
JournalNature chemistry
Volume11
Issue number11
DOIs
Publication statusPublished - 2019 Nov 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Liu, K., Qi, H., Dong, R., Shivhare, R., Addicoat, M., Zhang, T., Sahabudeen, H., Heine, T., Mannsfeld, S., Kaiser, U., Zheng, Z., & Feng, X. (2019). On-water surface synthesis of crystalline, few-layer two-dimensional polymers assisted by surfactant monolayers. Nature chemistry, 11(11), 994-1000. https://doi.org/10.1038/s41557-019-0327-5