Selective graphene formation on copper twin crystals

Kenjiro Hayashi, Shintaro Sato, Minoru Ikeda, Chioko Kaneta, Naoki Yokoyama

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


Selective graphene growth on copper twin crystals by chemical vapor deposition has been achieved. Graphene ribbons can be formed only on narrow twin crystal regions with a (001) or high-index surface sandwiched between Cu crystals having (111) surfaces by tuning the growth conditions, especially by controlling the partial pressure of CH 4 in Ar/H 2 carrier gas. At a relatively low CH 4 pressure, graphene nucleation at steps on Cu (111) surfaces is suppressed, and graphene is preferentially nucleated and formed on twin crystal regions. Graphene ribbons as narrow as ∼100 nm have been obtained in experiments. The preferential graphene nucleation and formation seem to be caused primarily by a difference in surface-dependent adsorption energies of reactants, which has been estimated by first principles calculations. Concentrations of reactants on a Cu surface have also been analyzed by solving a diffusion equation that qualitatively explains our experimental observations of the preferential graphene nucleation. Our findings may lead to self-organizing formation of graphene nanoribbons without reliance on top-down approaches in the future.

Original languageEnglish
Pages (from-to)12492-12498
Number of pages7
JournalJournal of the American Chemical Society
Issue number30
Publication statusPublished - 2012 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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