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Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays

Abstract

Two-dimensional (2D) supramolecular arrays provide a route to the spatial control of the chemical functionality of a surface, but their deposition is in almost all cases limited to a monolayer termination. Here we investigated the sequential deposition of one 2D array on another to form a supramolecular heterostructure and realize the growth—normal to the underlying substrate—of distinct ordered layers, each of which is stabilized by in-plane hydrogen bonding. For heterostructures formed by depositing terephthalic acid or trimesic acid on cyanuric acid/melamine, we have determined, using atomic force microscopy under ambient conditions, a clear epitaxial arrangement despite the intrinsically distinct symmetries and/or lattice constants of each layer. Structures calculated using classical molecular dynamics are in excellent agreement with the orientation, registry and dimensions of the epitaxial layers. Calculations confirm that van der Waals interactions provide the dominant contribution to the adsorption energy and registry of the layers.

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Figure 1: Adsorption of CAM on hBN.
Figure 2: Heterostructures of CAM and TMA.
Figure 3: Energetics of the CAM/TMA heterostructure.
Figure 4: TPA/CAM supramolecular heterostructure.
Figure 5: Energetics of the CAM/TPA heterostructure.

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Acknowledgements

We are grateful to the Leverhulme Trust for providing financial support under grant RPG-2016-104 and to the Engineering and Physical Sciences Research Council for support through grant EP/N033906/1. E.B. gratefully acknowledges the receipt of a European Research Council Consolidator Grant; M.B. and E.B. acknowledge the University of Nottingham and Midplus High Performance Computing facilities for providing computational time. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by MEXT, Japan, and the Japan Society for the Promotion of Science KAKENHI Grant Numbers JP26248061, JP15K21722 and JP25106006.

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V.V.K. and P.H.B. conceived and designed the experiments, which were carried out by V.V.K. The hBN crystals were grown by K.W. and T.T. The numerical calculations were conceived through a discussion between M.B., E.B., P.H.B. and V.V.K., and were carried out by M.B. with additional input from E.B. The paper was written by P.H.B., V.V.K., M.B. and E.B. with revisions and comments from all of the authors.

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Correspondence to Elena Besley or Peter H. Beton.

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Korolkov, V., Baldoni, M., Watanabe, K. et al. Supramolecular heterostructures formed by sequential epitaxial deposition of two-dimensional hydrogen-bonded arrays. Nature Chem 9, 1191–1197 (2017). https://doi.org/10.1038/nchem.2824

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