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

Chitengfei Zhang, Rong Tu, Mingdong Dong, Jun Li, Meijun Yang, Qizhong Li, Ji Shi, Haiwen Li, Hitoshi Ohmori, Song Zhang, Lianmeng Zhang, Takashi Goto

Research output: Contribution to journalArticle

Abstract

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
JournalCarbon
Volume150
DOIs
Publication statusPublished - Sep 2019

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Zhang, C., Tu, R., Dong, M., Li, J., Yang, M., Li, Q., ... Goto, T. (2019). Growth of umbrella-like millimeter-scale single-crystalline graphene on liquid copper. Carbon, 150, 356-362. https://doi.org/10.1016/j.carbon.2019.05.013