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首页> 外文期刊>Science Advances >Ultrathin graphdiyne film on graphene through solution-phase van der Waals epitaxy
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Ultrathin graphdiyne film on graphene through solution-phase van der Waals epitaxy

机译：通过溶液相范德华外延在石墨烯上形成超薄石墨二炔薄膜

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摘要

Graphdiyne (GDY) is an ordered two-dimensional (2D) carbon allotrope comprising sp- and sp2-hybridized carbon atoms with high degrees of π-conjugation, which features a natural band gap and superior electric properties. However, the synthesis of one- or few-layer GDY remains challenging because of the free rotation around alkyne-aryl single bonds and the lack of thickness control. We report the facile synthesis of an ultrathin single-crystalline GDY film on graphene through a solution-phase van der Waals epitaxial strategy. The weak admolecule-substrate interaction at the heterojunction drastically relaxes the large lattice mismatch between GDY and graphene. It allows the fast in-plane coupling of admolecules and slow out-of-plane growth toward the formation of an incommensurately stacked heterostructure, which is composed of single-layer graphene and few-layer ABC-stacked GDY, as directly observed by electron microscopy and identified from Raman fingerprints. This study provides a general route not only to the bottom-up synthesis of intriguing 2D acetylenic carbon allotropes but also to the device fabrication for the direct measurement of their intrinsic electrical, mechanical, and thermal properties.
机译：Graphdiyne（Graphyyne，GDY）是有序的二维（2D）碳同素异形体，包含具有高π共轭度的sp-和sp 2 杂化碳原子，具有自然的带隙和优异的电性能。然而，由于围绕炔-芳基单键的自由旋转和缺乏厚度控制，单层或几层GDY的合成仍然具有挑战性。我们报告了通过溶液相范德华外延策略在石墨烯上的超薄单晶GDY薄膜的简便合成。异质结处的弱分子与底物之间的相互作用极大地缓解了GDY与石墨烯之间的大晶格失配。通过电子显微镜可以直接观察到分子的快速面内偶联和缓慢的面外生长，从而形成了由单层石墨烯和几层ABC堆叠的GDY组成的不相称的堆叠异质结构。并从拉曼指纹识别。这项研究不仅为引人入胜的2D炔属碳同素异形体的自下而上的合成提供了一条通用途径，而且还为直接测量其固有的电，机械和热性能的器件制造提供了一条通用途径。

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