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ACS Nano. 2016 Sep 27;10(9):9000-8. doi: 10.1021/acsnano.6b05269. Epub 2016 Aug 30.

Substrate-Independent Growth of Atomically Precise Chiral Graphene Nanoribbons.

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Donostia International Physics Center (DIPC) , Paseo Manuel Lardizabal 4, 20018 San Sebastián, Spain.
Ikerbasque, Basque Foundation for Science , 48011 Bilbao, Spain.
Materials Physics Center, Centro de Física de Materiales (CSIC/UPV-EHU) , Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.
Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain.
CIC nanoGUNE , Avenida de Tolosa 76, 20018 San Sebastián, Spain.
Departamento de Física Aplicada I, Universidad del País Vasco , 20018 San Sebastián, Spain.
International Center of Materials Nanoarchitectonics, National Institute for Materials Science , 1-1 Namiki, Tsukuba 305-0044, Japan.


Contributing to the need for new graphene nanoribbon (GNR) structures that can be synthesized with atomic precision, we have designed a reactant that renders chiral (3,1)-GNRs after a multistep reaction including Ullmann coupling and cyclodehydrogenation. The nanoribbon synthesis has been successfully proven on different coinage metals, and the formation process, together with the fingerprints associated with each reaction step, has been studied by combining scanning tunneling microscopy, core-level spectroscopy, and density functional calculations. In addition to the GNR's chiral edge structure, the substantial GNR lengths achieved and the low processing temperature required to complete the reaction grant this reactant extremely interesting properties for potential applications.


Ullmann coupling; core-level photoemission; cyclodehydrogenation; density functional theory; on-surface synthesis; scanning tunneling microscopy

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