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The influence of substrate steps on the bottom-up synthesis of atomicallyprecise graphene nanoribbons (GNRs) on an Au(111) surface is investigated. Astraight surface step is found to promote the assembly of long and compactarrays of polymers with enhanced interchain pi-pi stacking interaction, whichcreates a steric hindrance effect on cyclodehydrogenation to suppress the Hpassivation of polymer ends. The modified two-stage growth process results inperiodic arrays of GNRs with doubled average length near step edges.

Step edge-mediated assembly of periodic arrays of long graphene nanoribbons on Au(111)