Sublimation-Induced Vapor Deposition of Cyanuric Acid-Melamine Supramolecular Single Crystals on Surfaces
Date
2024
Authors
Wang, Y.
Qi, R.
Ye, Z.
Xu, Y.
Wang, X.
Meng, H.
Liu, Z.
Meng, P.
Xu, J.
Editors
Advisors
Journal Title
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Volume Title
Type:
Journal article
Citation
Advanced Functional Materials, 2024; 34(40):2403868-1-2403868-8
Statement of Responsibility
Yuting Wang, Ruijuan Qi, Zilin Ye, Yanan Xu, Xiaodong Wang, Hang Meng, Zixuan Liu, Peng Meng, Jingsan Xu
Conference Name
Abstract
Herein, a low-temperature sublimation-based vapor deposition (SVD) method is developed to synthesize hexagonal crystal plates of cyanuric acid-melamine (CAM) with outstanding crystallinity. Through meticulous design of the reaction apparatus and careful selection of source materials, substrate-confined SVD in a tube furnace is explored to grow single crystals of CAM in hexagonal shapes. Additionally, the orientation preference of the (202) facet is revealed, corresponding to the 2D arrangement of the H-bonded network, of single-crystalline plates on surfaces using selected area electron diffraction and X-ray diffraction techniques. By employing atomic force microscopy and scanning electron microscopy for topography characterization, a mechanism of three-stage step-growth crystallization is proposed, including nucleation, in-plane expansion, and out-of-plane growth. Furthermore, it is found that the interactions among melamine molecules in CAM synthesized via SVD are more intense compared to those in CAM synthesized via water-based methods, as evidenced by infrared and photoluminescent spectra studies. Subsequent nanoindentation tests on the (202) facet of CAM single-crystalline plates reveals a reduced modulus and hardness of 12.8 and 0.82 GPa, respectively. This methodology addresses the longstanding challenge of synthesizing hexagonal CAM single crystals and provides valuable insights for the fabrication of functional organic crystalline materials.
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Dissertation Note
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© 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.