Cove-Edged Chiral Graphene Nanoribbons with Chirality-Dependent Bandgap and Carrier Mobility
Liu K, Zheng W, Osella S, Qiu ZL, Böckmann S, Niu W, Meingast L, Komber H, Obermann S, Gillen R, Bonn M, Hansen MR, Maultzsch J, Wang HI, Ma J, Feng X (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 146
Pages Range: 1026-1034
Journal Issue: 1
DOI: 10.1021/jacs.3c11975
Abstract
Graphene nanoribbons (GNRs) have garnered significant interest due to their highly customizable physicochemical properties and potential utility in nanoelectronics. Besides controlling widths and edge structures, the inclusion of chirality in GNRs brings another dimension for fine-tuning their optoelectronic properties, but related studies remain elusive owing to the absence of feasible synthetic strategies. Here, we demonstrate a novel class of cove-edged chiral GNRs (CcGNRs) with a tunable chiral vector (n,m). Notably, the bandgap and effective mass of (n,2)-CcGNR show a distinct positive correlation with the increasing value of n, as indicated by theory. Within this GNR family, two representative members, namely, (4,2)-CcGNR and (6,2)-CcGNR, are successfully synthesized. Both CcGNRs exhibit prominently curved geometries arising from the incorporated [4]helicene motifs along their peripheries, as also evidenced by the single-crystal structures of the two respective model compounds (1 and 2). The chemical identities and optoelectronic properties of (4,2)- and (6,2)-CcGNRs are comprehensively investigated via a combination of IR, Raman, solid-state NMR, UV-vis, and THz spectroscopies as well as theoretical calculations. In line with theoretical expectation, the obtained (6,2)-CcGNR possesses a low optical bandgap of 1.37 eV along with charge carrier mobility of ∼8 cm2 V-1 s-1, whereas (4,2)-CcGNR exhibits a narrower bandgap of 1.26 eV with increased mobility of ∼14 cm2 V-1 s-1. This work opens up a new avenue to precisely engineer the bandgap and carrier mobility of GNRs by manipulating their chiral vector.
Authors with CRIS profile
Involved external institutions
Technische Universität Dresden
Germany (DE)
Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research
Germany (DE)
University of Warsaw / Uniwersytet Warszawski
Poland (PL)
Westfälische Wilhelms-Universität (WWU) Münster
Germany (DE)
Leibniz-Institut für Polymerforschung Dresden e. V.
Germany (DE)
Germany (DE)
Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research
Germany (DE)
University of Warsaw / Uniwersytet Warszawski
Poland (PL)
Westfälische Wilhelms-Universität (WWU) Münster
Germany (DE)
Leibniz-Institut für Polymerforschung Dresden e. V.
Germany (DE)
How to cite
APA:
Liu, K., Zheng, W., Osella, S., Qiu, Z.L., Böckmann, S., Niu, W.,... Feng, X. (2024). Cove-Edged Chiral Graphene Nanoribbons with Chirality-Dependent Bandgap and Carrier Mobility. Journal of the American Chemical Society, 146(1), 1026-1034. https://doi.org/10.1021/jacs.3c11975
MLA:
Liu, Kun, et al. "Cove-Edged Chiral Graphene Nanoribbons with Chirality-Dependent Bandgap and Carrier Mobility." Journal of the American Chemical Society 146.1 (2024): 1026-1034.
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