Ultrathin graphdiyne film on graphene through solution-phase van der Waals epitaxy.
Ultrathin graphdiyne film on graphene through solution-phase van der Waals epitaxy.
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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
DOI:
10.1126/sciadv.aat6378
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发表时间:
2018-07
期刊:
影响因子:
13.6
通讯作者:
Zhang J
中科院分区:
文献类型:
--
作者:
Gao X;Zhu Y;Yi D;Zhou J;Zhang S;Yin C;Ding F;Zhang S;Yi X;Wang J;Tong L;Han Y;Liu Z;Zhang J
A trilayer single-crystalline GDY film on graphene was prepared through a solution-phase van der Waals epitaxial strategy. 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.
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