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Selective graphene formation on copper twin crystals.

Kenjiro Hayashi1, Shintaro Sato, Minoru Ikeda

  • 1Green Nanoelectronics Center (GNC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan.

Journal of the American Chemical Society
|July 12, 2012
PubMed
Summary

Researchers achieved selective graphene growth on copper twin crystals, forming narrow graphene ribbons by controlling methane gas pressure during chemical vapor deposition. This method offers a potential pathway for self-organized graphene nanoribbon fabrication.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Graphene synthesis is crucial for advanced electronics.
  • Controlling graphene growth on specific crystal facets remains challenging.
  • Copper surfaces are widely used for graphene chemical vapor deposition (CVD).

Purpose of the Study:

  • To achieve selective graphene growth on copper twin crystals.
  • To investigate the formation of graphene ribbons on specific copper surface regions.
  • To understand the mechanisms behind preferential graphene nucleation and growth.

Main Methods:

  • Chemical vapor deposition (CVD) on copper twin crystals.
  • Controlled variation of methane (CH4) partial pressure in Ar/H2 carrier gas.

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  • First principles calculations to estimate reactant adsorption energies.
  • Diffusion equation analysis to model reactant concentrations.

    • Main Results:

    • Selective graphene growth was achieved on narrow twin crystal regions of copper.
    • Graphene ribbons as narrow as approximately 100 nm were fabricated.
    • Graphene nucleation on Cu (111) surfaces was suppressed at low CH4 pressures.
    • Preferential nucleation occurred on twin crystal regions with (001) or high-index surfaces.

    Conclusions:

    • Tuning growth conditions, particularly CH4 partial pressure, enables selective graphene ribbon formation.
    • Differences in surface-dependent adsorption energies are the primary cause of preferential nucleation.
    • This approach may enable self-organizing fabrication of graphene nanoribbons, avoiding top-down methods.