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Graphene nanoribbons (GNRs) synthesized using a bottom-up techniquepotentially enable future electronic devices owing to the tunable electronicstructures depending on the well-defined width and edge geometry. For instance,armchair-edged GNRs (AGNRs) exhibit width-dependent bandgaps. However, thebandgaps of AGNRs synthesized experimentally thus far are relatively large,well above 1 eV. Such a large bandgap may deteriorate device performances dueto large Schottky barriers and carrier effective masses. We describe thebottom-up synthesis of AGNRs with a smaller bandgap using dibromobenzene-basedprecursors. Two types of AGNRs with different widths of 17 and 13 carbon atomswere synthesized on Au(111), and their atomic and electronic structures wereinvestigated by scanning probe microscopy and spectroscopy. We reveal that the17-AGNRs has the smallest bandgap as well as the smallest electron/holeeffective mass among bottom-up AGNRs reported thus far. The successfulsynthesis of 17-AGNRs is a significant step toward the development of GNR-basedelectronic devices.

Small bandgap features achieved in atomically precise 17-atom-wide armchair-edged graphene nanoribbons