Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Poster Monday: Nanostructures 1
O 23.9: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Graphitic nitrogen substitution in graphene nanoribbons — •Nicolò Bassi1, Feifei Xiang1, Pascal Ruffieux1, Akimitsu Narita2, Klaus Müllen2, and Roman Fasel1 — 1Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland — 2Max Planck Institute for Polymer Research, 55124 Mainz, Germany
Graphene nanoribbons (GNRs), nanometer-wide strips of graphene, have attracted significant attention thanks to their tunable electronic properties originating from quantum confinement. A possible way to control these properties is through carbon substitution with heteroatoms, such as nitrogen. Despite a large number of theoretical studies, there are few experiments where controlled N substitution has been achieved. We report the on-surface synthesis on Au of two different types of nanoribbons containing N atoms from specifically designed heteroaromatic precursors. The chemical structures of the resulting ribbons were characterized using scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM). We demonstrate the high quality ribbons growth, which involves a facile C-N bond formation at temperatures below typical C-C reactions. The electronic properties were further investigated by scanning tunneling spectroscopy (STS), which revealed unoccupied states localized on N atoms that are absent in the undoped sections. These results open new perspectives for growing and studying novel types of GNRs with the possibility to fine-tune electronic properties by controlled heteroatom substitution.