Rational synthesis of atomically precise graphene nanoribbons directly on metal oxide surfaces

M. Kolmer, A.K. Steiner, I. Izydorczyk, W. Ko, M. Engelund, M. Szymonski, A.-P. Li, K. Amsharov
2020 Science  
Atomically precise graphene nanoribbons (GNRs) attract great interest because of their highly tunable electronic, optical, and transport properties. However, on-surface synthesis of GNRs is typically based on metal-surface assisted chemical reactions, where metallic substrates strongly screen their designer electronic properties and limit further applications. Here, we present an on-surface synthesis approach to forming atomically precise GNRs directly on semiconducting metal oxide surfaces.
more » ... thermally triggered multistep transformations preprogrammed in our precursors' design rely on highly selective and sequential activations of C-Br, C-F bonds and cyclodehydrogenation. The formation of planar armchair GNRs terminated by well-defined zigzag ends is confirmed by scanning tunneling microscopy and spectroscopy, which also reveal weak interaction between GNRs and the rutile TiO2 substrate.
doi:10.1126/science.abb8880 pmid:32586951 fatcat:qfb4ddvb35dkfnmgmokgceelri