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.
Highlights
(n,m) which connects crystallographically equivalent sites along the edge and defines the edge structure of the Graphene nanoribbons (GNRs).[4]
NAP 7 was synthesized as the precursor monomer, which allowed for the fabrication of unprecedented benzo-fused chiral (2,1)-GNR 9 having cove edges, on a Au
This work expands the structural variety of GNRs, providing an insight into the nonplanarity induced by the cove edge geometry and formation of chiral GNRs
Summary
Ashok Keerthi+,[a] Carlos Sánchez-Sánchez+,[b, c] Okan Deniz,[b] Pascal Ruffieux,[b]. Through on-surface synthesis, AGNRs with varying widths have been achieved, exhibiting distinct bandgaps in agreement with theoretical predictions.[1e,i,13] Formation of a ZGNR with perfect zigzag edge structure was unambiguously demonstrated, along with the presence of edge-localized electronic states.[11a]. A cove-edge GNR was prepared by using a dibromobichrysene precursor, demonstrating its non-planar structure on a
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