Growth of umbrella-like millimeter-scale single-crystalline graphene on liquid copper

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  • Chitengfei Zhang, Wuhan University of Technology
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  • Rong Tu, Wuhan University of Technology
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  • Mingdong Dong
  • Jun Li, Institute of Fluid Physics
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  • Meijun Yang, Wuhan University of Technology
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  • Qizhong Li, Wuhan University of Technology
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  • Ji Shi, Wuhan University of Technology, Tokyo Institute of Technology
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  • Haiwen Li, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, International Research Center for Hydrogen Energy, Kyushu University
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  • Hitoshi Ohmori, Wuhan University of Technology, Institute of Physical and Chemical Research
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  • Song Zhang, Wuhan University of Technology
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  • Lianmeng Zhang, Wuhan University of Technology
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  • Takashi Goto, Wuhan University of Technology

Novel single-crystalline umbrella-like graphene (ULG) domains with the diameter up to 0.6 mm were achieved on liquid copper by atmospheric pressure chemical vapor deposition (APCVD). ULG exhibits 6-fold symmetry with 6 ribs. Raman spectroscopy analysis revealed that the ULG was few-layer graphene with ultralow level of defects. Scanning Tunneling Microscope (STM) and selected area electron diffraction (SAED) results shown the single-crystalline nature of ULG. Transmission electron microscopy (TEM) shown the thickness of the panel was 3.5 nm and the thickness of the rib varied gradiently from 11.22 nm to 5.44 nm. The growth mechanism of the ULG was also explored by studying the influence of varied methane and hydrogen flow, which shows the ULG was formed during the nucleation stage. The larger flow of hydrogen supported decreasing the nucleation density of ULG, which was preferred for the formation of large domain ULG. Moreover, ULG partially immersed into liquid copper during the nucleation stage, thus, carbon atoms could reach each layer of ULG, leading to the continual growth of ULG graphene.

Original languageEnglish
Pages (from-to)356-362
Number of pages7
Publication statusPublished - Sep 2019

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