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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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Spiral Growth of Adlayer Graphene

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Title
Spiral Growth of Adlayer Graphene
Author
Sun, HaibinKong, XiaoPark, HyojuLiu, FengningLee, ZonghoonDing, Feng
Issue Date
2022-03
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.34, no.12, pp.2107587
Abstract
The morphology of as-grown graphene in chemical vapor deposition (CVD) experiments is sensitive to the reaction environment. Understanding the mechanism of formation of different graphene morphologies is essential to achieve controlled graphene CVD growth. Here the growth and formation mechanism of adlayer graphene spirals are reported. An adlayer graphene spiral is formed by fast propagation of the tips of spiral arms along the edge of the first graphene layer. The driving force to form spirals is the limited availability of carbon diffusing from the Cu surface through the edge of the first graphene layer. In addition, it is found that graphene onions are formed by overlapping graphene spirals with clockwise and anticlockwise arms. Based on these features, a kinetic Monte Carlo (kMC) method is demonstrated using which all the observed graphene spiral structures are successfully reproduced at the atomic level. This study thus unravels the hither-to unresolved mechanism of graphene onion growth and paves the way to the controllable growth of few-layer graphene by increasing the carbon supply at the edge of the first layer graphene.
URI
https://scholarworks.unist.ac.kr/handle/201301/57316
URL
https://onlinelibrary.wiley.com/doi/10.1002/adma.202107587
DOI
10.1002/adma.202107587
ISSN
0935-9648
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