Toward Cove-Edged Low Band Gap Graphene Nanoribbons

Liu J, Li BW, Tan YZ, Giannakopoulos A, Sanchez-Sanchez C, Beljonne D, Ruffieux P, Fasel R, Feng X, Muellen K (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Journal of the American Chemical Society American Chemical Society

Book Volume: 137

Pages Range: 6097-6103

Journal Issue: 18

DOI: 10.1021/jacs.5b03017

Abstract

Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increasing attention as promising candidates for next-generation semiconductors. Here, we demonstrate a bottom-up strategy toward novel low band gap GNRs (Eg = 1.70 eV) with a well-defined cove-type periphery both in solution and on a solid substrate surface with chrysene as the key monomer. Corresponding cyclized chrysene-based oligomers consisting of the dimer and tetramer are obtained via an Ullmann coupling followed by oxidative intramolecular cyclodehydrogenation in solution, and much higher GNR homologues via on-surface synthesis. These oligomers adopt nonplanar structures due to the steric repulsion between the two C-H bonds at the inner cove position. Characterizations by single crystal X-ray analysis, UV-vis absorption spectroscopy, NMR spectroscopy, and scanning tunneling microscopy (STM) are described. The interpretation is assisted by density functional theory (DFT) calculations. (Figure Presented).

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE) Xiamen University CN China (CN) University of Mons / Université de Mons BE Belgium (BE) Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology CH Switzerland (CH) Technische Universität Dresden DE Germany (DE)

How to cite

APA:

Liu, J., Li, B.-W., Tan, Y.-Z., Giannakopoulos, A., Sanchez-Sanchez, C., Beljonne, D.,... Muellen, K. (2015). Toward Cove-Edged Low Band Gap Graphene Nanoribbons. Journal of the American Chemical Society, 137(18), 6097-6103. https://doi.org/10.1021/jacs.5b03017

MLA:

Liu, Junzhi, et al. "Toward Cove-Edged Low Band Gap Graphene Nanoribbons." Journal of the American Chemical Society 137.18 (2015): 6097-6103.

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