Bottom-up fabrication of atomically precise graphene nanoribbons with zigzag edge topology

ROM 2016-07
Author: Pascal Ruffieux
Institute: Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
Instrument: LT STM

Structuring graphene at the nanoscale allows tailoring specific electronic properties in a wide range. For the of armchair graphene nanoribbons (AGNRs), for instance, the atomically precise width definition and edge passivation achieved with a bottom-up fabrication approach allows engineering specific electronic band gaps. Even more intriguing, graphene nanoribbons with zigzag edges (ZGNRs) are predicted to host spin polarized electronic edge states that would make them suitable for spintronics applications.

Within a collaboration between synthetic chemists and surface scientists, the synthesis of atomically precise ZGNR has now been demonstrated using a bottom-up strategy based on the surface-assisted colligation and dehydrogenation of specifically designed precursor monomers. Based on non-contact atomic force microscopy (nc-AFM) imaging with CO-functionalized tips, the local bond configurations of the final GNR structure can be directly resolved, which confirms that the observed width and edge morphology corresponds to the expected 6-ZGNR structure as defined by the design of the precursor monomer.

List of authors and institutes:
Pascal Ruffieux1, Shiyong Wang1, Bo Yang2, Carlos Sánchez-Sánchez1, Jia Liu1, Thomas Dienel1, Leopold Talirz1, Prashant Shinde1, Carlo A. Pignedoli1,3, Daniele Passerone1, Tim Dumslaff2, Xinliang Feng4, Klaus Müllen2 & Roman Fasel1,5

1) Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.

2) Max Planck Institute for Polymer Research, 55128 Mainz, Germany.

3) NCCR MARVEL, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland.

4) Center for Advancing Electronics Dresden & Department of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.

5) Department of Chemistry and Biochemistry, University of Bern, 3012 Bern, Switzerland.

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