On-Surface Synthesis and Characterization of 9-Atom Wide Armchair Graphene Nanoribbons

Talirz, Leopold; Söde, Hajo; Dumslaff, Tim; Wang, Shiyong; Sanchez-Valencia, Juan Ramon; Liu, Jia; Shinde, Prashant; Pignedoli, Carlo A.; Liang, Liangbo; Meunier, Vincent; Plumb, Nicholas C.; Shi, Ming; Feng, Xinliang; Narita, Akimitsu; Müllen, Klaus; Fasel, Roman; Ruffieux, Pascal

doi:10.1021/acsnano.6b06405

Title: On-Surface Synthesis and Characterization of 9-Atom Wide Armchair Graphene Nanoribbons

Journal Article · Fri Jan 27 00:00:00 EST 2017 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.6b06405· OSTI ID:1346658

^[1]; Söde, Hajo ^[1]; Dumslaff, Tim ^[2]; Wang, Shiyong ^[1]; Sanchez-Valencia, Juan Ramon ^[1]; Liu, Jia ^[1]; Shinde, Prashant ^[1]; Pignedoli, Carlo A. ^[3];

^[4]; Meunier, Vincent ^[5]; Plumb, Nicholas C. ^[6]; Shi, Ming ^[6]; Feng, Xinliang ^[7]; Narita, Akimitsu ^[2];

^[2]; Fasel, Roman ^[8];

^[1]

Swiss Federal Laboratories for Materials Science and Technology (Empa) (Switzerland). nanotech@surfaces Laboratory
Max Planck Institute for Polymer Research (Germany)
Swiss Federal Laboratories for Materials Science and Technology (Empa) (Switzerland). nanotech@surfaces Laboratory and NCCR MARVEL
Rensselaer Polytechnic Institute, Troy, NY (United States). Department of Physics, Applied Physics, and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Rensselaer Polytechnic Institute, Troy, NY (United States). Department of Physics, Applied Physics, and Astronomy
Paul Scherrer Institute (Switzerland). Swiss Light Source
Dresden Univ. of Technology (Germany). Center for Advancing Electronics Dresden and Department of Chemistry and Food Chemistry
Swiss Federal Laboratories for Materials Science and Technology (Empa) (Switzerland). nanotech@surfaces Laboratory; University of Bern (Switzerland). Department of Chemistry and Biochemistry

The bottom-up approach to synthesize graphene nanoribbons strives not only to introduce a band gap into the electronic structure of graphene but also to accurately tune its value by designing both the width and edge structure of the ribbons with atomic precision. Within this paper, we report the synthesis of an armchair graphene nanoribbon with a width of nine carbon atoms on Au(111) through surface-assisted aryl–aryl coupling and subsequent cyclodehydrogenation of a properly chosen molecular precursor. By combining high-resolution atomic force microscopy, scanning tunneling microscopy, and Raman spectroscopy, we demonstrate that the atomic structure of the fabricated ribbons is exactly as designed. Angle-resolved photoemission spectroscopy and Fourier-transformed scanning tunneling spectroscopy reveal an electronic band gap of 1.4 eV and effective masses of ≈0.1 m_e for both electrons and holes, constituting a substantial improvement over previous efforts toward the development of transistor applications. We use ab initio calculations to gain insight into the dependence of the Raman spectra on excitation wavelength as well as to rationalize the symmetry-dependent contribution of the ribbons’ electronic states to the tunneling current. Lastly, we propose a simple rule for the visibility of frontier electronic bands of armchair graphene nanoribbons in scanning tunneling spectroscopy.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1346658

Journal Information:: ACS Nano, Vol. 11, Issue 2; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 220 works

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36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
bottom-up synthesis
graphene nanoribbons
on-surface chemistry
Raman spectroscopy
scanning tunneling spectroscopy

Title: On-Surface Synthesis and Characterization of 9-Atom Wide Armchair Graphene Nanoribbons

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