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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface

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Title
Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface
Author
Liu, FengningDong, JichenKim, Na YeonLee, ZonghoonDing, Feng
Issue Date
2021-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v.17, no.40, pp.2103484
Abstract
Although grain boundaries (GBs) in two-dimensional (2D) materials have been extensively observed and characterized, their formation mechanism still remains unexplained. Here a general model has reported to elucidate the mechanism of formation of GBs during 2D materials growth. Based on our model, a general method is put forward to synthesize twinned 2D materials on a liquid substrate. Using graphene growth on liquid Cu surface as an example, the growth of twinned graphene has been demonstrated successfully, in which all the GBs are ultra-long straight twin boundaries. Furthermore, well-defined twin boundaries (TBs) are found in graphene that can be selectively etched by hydrogen gas due to the preferential adsorption of hydrogen atoms at high-energy twins. This study thus reveals the formation mechanism of GBs in 2D materials during growth and paves the way to grow various 2D nanostructures with controlled GBs.
URI
https://scholarworks.unist.ac.kr/handle/201301/54070
URL
https://onlinelibrary.wiley.com/doi/10.1002/smll.202103484
DOI
10.1002/smll.202103484
ISSN
1613-6810
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