On-surface synthesis of graphene nanoribbons with zigzag edge topology

Ruffieux, Pascal; Wang, Shiyong; Yang, Bo; Sánchez-Sánchez, Carlos; Liu, Jia; Dienel, Thomas; Talirz, Leopold; Shinde, Prashant; Pignedoli, Carlo A.; Passerone, Daniele; Dumslaff, Tim; Feng, Xinliang; Müllen, Klaus; Fasel, Roman (2016). On-surface synthesis of graphene nanoribbons with zigzag edge topology. Nature, 531(7595), pp. 489-492. Macmillan Journals Ltd. 10.1038/nature17151

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Graphene-based nanostructures exhibit electronic properties that are not present in extended graphene. For example, quantum confinement in carbon nanotubes and armchair graphene nanoribbons leads to the opening of substantial electronic bandgaps that are directly linked to their structural boundary conditions1, 2. Nanostructures with zigzag edges are expected to host spin-polarized electronic edge states and can thus serve as key elements for graphene-based spintronics3. The edge states of zigzag graphene nanoribbons (ZGNRs) are predicted to couple ferromagnetically along the edge and antiferromagnetically between the edges4, but direct observation of spin-polarized edge states for zigzag edge topologies—including ZGNRs—has not yet been achieved owing to the limited precision of current top-down approaches5, 6, 7, 8, 9, 10. Here we describe the bottom-up synthesis of ZGNRs through surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers to yield atomically precise zigzag edges. Using scanning tunnelling spectroscopy we show the existence of edge-localized states with large energy splittings. We expect that the availability of ZGNRs will enable the characterization of their predicted spin-related properties, such as spin confinement11 and filtering12, 13, and will ultimately add the spin degree of freedom to graphene-based circuitry.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Fasel, Roman

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science > 530 Physics

ISSN:

0028-0836

Publisher:

Macmillan Journals Ltd.

Language:

English

Submitter:

Roman Fasel

Date Deposited:

05 Jan 2017 11:40

Last Modified:

06 Jan 2017 22:30

Publisher DOI:

10.1038/nature17151

PubMed ID:

27008967

BORIS DOI:

10.7892/boris.90580

URI:

https://boris.unibe.ch/id/eprint/90580

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