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Keywords:

  • graphene nanoribbons;
  • SiC;
  • epitaxial graphene;
  • high step;
  • width tuning
Thumbnail image of graphical abstract

An approach to fabricate large-scale graphene nanoribbons (GNRs) with tunable ribbon widths is presented. Regular steps with variable heights from 1 to 100 nm can be prepared on a SiC substrate by a low-pressure etching process. Graphene can be epitaxially grown only on the side walls of the steps, thereby leading to GNRs with controllable widths.