Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Poster Focus Session: Molecular Nanostructures on Surfaces - New Concepts towards Complex Architectures
O 81.13: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Tuning the band structures of graphene nanoribbons by functionalized edge groups — •Jingcheng Li1,2, Néstor Merino-Díez2,3, Eduard Carbonell-Sanroma1, Jeremy Hieulle1, Manuel Vilas-Varela5, Aran García-Lekue3, Pedro Brandimarte2, Martina Corso2,4, Daniel Sanchez-Portal2, Dimas G. de Oteyza3,4, Aitor Mugarza6, Diego Peña5, and Jose Ignacio Pascual1,4 — 1CIC Nanogune, 20018 San Sebastián, Spain — 2CFM, 20018 San Sebastián, Spain — 3DIPC, 20018 San Sebastián, Spain — 4Ikerbasque, 48013 Bilbao, Spain — 5CIQUS, 15782 Santiago de Compostela, Spain — 6ICN2, 08193 Barcelona, Spain
On-surface synthesis of atomically precise graphene nanoribbons (GNRs) allows engineering the band structures of GNRs by modifying the molecular precursors. Until now, most of the works are focused on the chemical substitution of carbon atoms by heteroatoms in GNRs. Here in this work, we show that band structure of GNRs can be tuned by edge functionalization of GNRs. The effect of cyano (-CN) edge group on the band structure of armchair GNRs (aGNRs), and the effect of amino (-NH2) and nitro (-NO2) edge groups on the band structure of chiral GNRs (cGNRs) are studied. We found that cyano edge groups act as n-dopants, down-shifting the bands of aGNRs, while amino edge groups acts as p-dopants, up-shifting the bands of cGNRs. Due to the reactivity of nitro edge groups on surface, their effect on the band structures of cGNRs need to be further clarified.