Universal Oriented van der Waals Epitaxy of 1D Cyanide Chains on Hexagonal 2D Crystals.,Advanced Science

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Universal Oriented van der Waals Epitaxy of 1D Cyanide Chains on Hexagonal 2D Crystals.
Advanced Science ( IF 14.3 ) Pub Date : 2019-12-19 , DOI: 10.1002/advs.201900757
Yangjin Lee _{1,

2} , Jahyun Koo ₃ , Sol Lee _{1,

2} , Jun-Yeong Yoon _{1,

2} , Kangwon Kim ₄ , Myeongjin Jang ₁ , Jeongsu Jang _{1,

5} , Jeongheon Choe ₁ , Bao-Wen Li ₆ , Chinh Tam Le ₇ , Farman Ullah ₇ , Yong Soo Kim ₇ , Jun Yeon Hwang ₈ , Won Chul Lee ₉ , Rodney S Ruoff _{6,

10,

11,

12} , Hyeonsik Cheong ₄ , Jinwoo Cheon _{2,

13,

14} , Hoonkyung Lee ₃ , Kwanpyo Kim _{1,

2}

Affiliation

Department of Physics Yonsei University Seoul 03722 Korea.
Center for Nanomedicine Institute for Basic Science (IBS) Seoul 03722 Korea.
Department of Physics Konkuk University Seoul 05029 Korea.
Department of Physics Sogang University Seoul 04107 Korea.
Department of Physics Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Korea.
Center for Multidimensional Carbon Materials (CMCM) Institute for Basic Science (IBS) Ulsan 44919 Korea.
Department of Physics and Energy Harvest-Storage Research Center University of Ulsan Ulsan 44610 Korea.
Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 55324 Korea.
Department of Mechanical Engineering Hanyang University Ansan 15588 Korea.
Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Korea.
School of Materials Science and Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Korea.
School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 44919 Korea.
Department of Chemistry Yonsei University Seoul 03722 Korea.
Graduate Program of Nano Biomedical Engineering Yonsei-IBS Institute Yonsei University Seoul 03722 Korea.

The atomic or molecular assembly on 2D materials through the relatively weak van der Waals interaction is quite different from the conventional heteroepitaxy and may result in unique growth behaviors. Here, it is shown that straight 1D cyanide chains display universal epitaxy on hexagonal 2D materials. A universal oriented assembly of cyanide crystals (AgCN, AuCN, and Cu0.5Au0.5CN) is observed, where the chains are aligned along the three zigzag lattice directions of various 2D hexagonal crystals (graphene, h-BN, WS2, MoS2, WSe2, MoSe2, and MoTe2). The potential energy landscape of the hexagonal lattice induces this preferred alignment of 1D chains along the zigzag lattice directions, regardless of the lattice parameter and surface elements as demonstrated by first-principles calculations and parameterized surface potential calculations. Furthermore, the oriented microwires can serve as crystal orientation markers, and stacking-angle-controlled vertical 2D heterostructures are successfully fabricated by using them as markers. The oriented van der Waals epitaxy can be generalized to any hexagonal 2D crystals and will serve as a unique growth process to form crystals with orientations along the zigzag directions by epitaxy.

中文翻译：

六方二维晶体上一维氰化物链的通用取向范德华外延。

通过相对较弱的范德华相互作用在二维材料上进行原子或分子组装与传统的异质外延有很大不同，并且可能导致独特的生长行为。在这里，研究表明直的一维氰化物链在六方二维材料上表现出普遍的外延。观察到氰化物晶体（AgCN、AuCN 和 Cu0.5Au0.5CN）的通用定向组装，其中链沿着各种二维六方晶体（石墨烯、h-BN、WS2、MoS2、WSe2）的三个锯齿形晶格方向排列、MoSe2 和 MoTe2）。六方晶格的势能景观导致一维链沿着之字形晶格方向优选排列，无论晶格参数和表面元素如何，如第一性原理计算和参数化表面势计算所证明的。此外，定向微线可以作为晶体取向标记，并且利用它们作为标记成功地制备了堆叠角度控制的垂直二维异质结构。定向范德华外延可以推广到任何六方二维晶体，并且将作为一种独特的生长过程，通过外延形成沿之字形方向取向的晶体。

更新日期：2019-12-20

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