On‐surface Synthesis of a Chiral Graphene Nanoribbon with Mixed Edge Structure
Ashok Keerthi, Carlos Sánchez‐Sánchez, Okan Deniz, Pascal Ruffieux, Dieter Schollmeyer, Xinliang Feng, Akimitsu Narita, Román Fasel, Kläus Müllen
Abstract
Chiral graphene nanoribbons represent an important class of graphene nanomaterials with varying combinations of armchair and zigzag edges conferring them unique structure-dependent electronic properties. Here, we describe the on-surface synthesis of an unprecedented cove-edge chiral GNR with a benzo-fused backbone on a Au(111) surface using 2,6-dibromo-1,5-diphenylnaphthalene as precursor. The initial precursor self-assembly and the formation of the chiral GNRs upon annealing are revealed, along with a relatively small electronic bandgap of approximately 1.6 eV, by scanning tunnelling microscopy and spectroscopy.