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Lindenthal, Sebastian [VerfasserIn]; Fazzi, Daniele [VerfasserIn]; Zorn, Nicolas [VerfasserIn]; El Yumin, Abdurrahman Ali [VerfasserIn]; Settele, Simon [VerfasserIn]; Weidinger, Britta [VerfasserIn]; Blasco, Eva [VerfasserIn]; Zaumseil, Jana [VerfasserIn]

Understanding the optical properties of doped and undoped 9-armchair graphene nanoribbons in dispersion

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  • Medientyp: E-Artikel
  • Titel: Understanding the optical properties of doped and undoped 9-armchair graphene nanoribbons in dispersion
  • Beteiligte: Lindenthal, Sebastian [VerfasserIn]; Fazzi, Daniele [VerfasserIn]; Zorn, Nicolas [VerfasserIn]; El Yumin, Abdurrahman Ali [VerfasserIn]; Settele, Simon [VerfasserIn]; Weidinger, Britta [VerfasserIn]; Blasco, Eva [VerfasserIn]; Zaumseil, Jana [VerfasserIn]
  • Erschienen: September 26, 2023
  • Erschienen in: American Chemical Society: ACS nano ; 17(2023), 18 vom: Nov., Seite 18240-18252
  • Sprache: Englisch
  • DOI: 10.1021/acsnano.3c05246
  • ISSN: 1936-086X
  • Identifikator:
  • Entstehung:
  • Anmerkungen: Online veröffentlicht: 11. September 2023
  • Beschreibung: Graphene nanoribbons are one-dimensional stripes of graphene with width- and edge-structure-dependent electronic properties. They can be synthesized bottom-up in solution to obtain precise ribbon geometries. Here we investigate the optical properties of solution-synthesized 9-armchair graphene nanoribbons (9-aGNRs) that are stabilized as dispersions in organic solvents and further fractionated by liquid cascade centrifugation (LCC). Absorption and photoluminescence spectroscopy reveal two near-infrared absorption and emission peaks whose ratios depend on the LCC fraction. Low-temperature single-nanoribbon photoluminescence spectra suggest the presence of two different nanoribbon species. Based on density functional theory (DFT) and time-dependent DFT calculations, the lowest energy transition can be assigned to pristine 9-aGNRs, while 9-aGNRs with edge-defects, caused by incomplete graphitization, result in more blue-shifted transitions and higher Raman D/G-mode ratios. Hole doping of 9-aGNR dispersions with the electron acceptor F4TCNQ leads to concentration dependent bleaching and quenching of the main absorption and emission bands and the appearance of red-shifted, charge-induced absorption features but no additional emission peaks, thus indicating the formation of polarons instead of the predicted trions (charged excitons) in doped 9-aGNRs.
  • Zugangsstatus: Freier Zugang