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Ding, Feng
IBS - Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Theoretical methods development for materials studies.

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Formation of Twinned Graphene Polycrystals

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Title
Formation of Twinned Graphene Polycrystals
Author
Dong, JichenGeng, DechaoLiu, FengningDing, Feng
Issue Date
2019-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.58, no.23, pp.7723 - 7727
Abstract
Liquid metals have been widely used as substrates to grow graphene and other 2D materials. On a homogeneous and isotropic liquid surface, a polycrystalline 2D material is formed by coalescence of many randomly nucleated single-crystal islands, and as a result, the domains in a polycrystal are expected to be randomly aligned. Here, we report the unexpected finding that only 30 degrees-twinned graphene polycrystals are grown on a liquid Cu surface. Atomic simulations confirm that the unique domain alignment in graphene polycrystals is due to the free rotation of graphene islands on the liquid Cu surface and the highly stable 30 degrees-grain boundaries in graphene. In-depth analysis predicts 30 types of possible 30 degrees-twinned graphene polycrystals and 27 of them are observed. The revealed formation mechanism of graphene polycrystals on a liquid Cu surface deepens our fundamental understanding on polycrystal growth and could serve as a guideline for the controlled synthesis of 2D materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/27244
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201902441
DOI
10.1002/anie.201902441
ISSN
1433-7851
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