Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures I
O 11.2: Vortrag
Montag, 12. März 2018, 15:30–15:45, MA 004
Hierarchical On-Surface Synthesis of Deterministic Graphene Nanoribbon Heterojunctions — •Christopher Bronner1, Rebecca A. Durr2, Daniel J. Rizzo1, Yea-Lee Lee1,3, Tomas Marangoni2, Alin Miksi Kalayjian2, Henry Rodriguez1, William Zhao1, Steven G. Louie1,4, Felix R. Fischer2,4,5, and Michael F. Crommie1,4,5 — 1Dept. of Physics, University of California, Berkeley, United States — 2Dept. of Chemistry, University of California, Berkeley, United States — 3Dept. of Physics, Pohang University of Science and Technology, Korea — 4Materials Sciences Division, Lawrence Berkeley National Laboratory, United States — 5Kavli ENSI, Berkeley, United States
Heterojunctions of two dissimilar bottom-up fabricated graphene nanoribbons (GNRs) provide a platform for new functional devices on the molecular scale. Their on-surface synthesis via copolymerization of two different Br-substituted precursors has been previously reported, but unselective copolymerization results in random sequences of the two constituting GNRs. We demonstrate on-surface synthesis of non-random GNR heterojunctions employing a hierarchical growth strategy. Using both I and Br-substituted precursors with different halogen bond strengths as well as a bifunctional linker molecule allows us to grow the two different segments sequentially. The resulting block-copolymers translate into deterministic GNR heterostructures of two chevron-GNRs joined in only one heterojunction, suitable for device integration.