Optical properties of doped and undoped 9-armchair graphene nanoribbons [data]

• Verfasst von: Lindenthal, Sebastian [VerfasserIn]
• Verfasst von: Fazzi, Daniele [VerfasserIn]
• Verfasst von: Zorn, Nicolas [VerfasserIn]
• Verfasst von: El Yumin, Abdurrahman Ali [VerfasserIn]
• Verfasst von: Settele, Simon [VerfasserIn]
• Verfasst von: Weidinger, Britta [VerfasserIn]
• Verfasst von: Blasco, Eva [VerfasserIn]
• Verfasst von: Zaumseil, Jana [VerfasserIn]
• Titel: Optical properties of doped and undoped 9-armchair graphene nanoribbons [data]
• Titelzusatz: optimized geometries for graphene nanoribbons with and without defects
• Verf.angabe: Sebastian Steffen Lindenthal, Daniele Fazzi, Nicolas Frederic Zorn, Abdurrahman Ali El Yumin, Simon Settele, Britta Weidinger, Eva Blasco, Jana Zaumseil
• Verlagsort: Heidelberg
• Verlag: Universität
• E-Jahr: 2023
• Jahr: 2023-06-05
• Umfang: 1 Online-Ressource (12 Files)
• Fussnoten: Gefördert durch: European Research Council: Grant Agreement No. 817494 “TRIFECTs" ; Gesehen am 12.06.2023
• DOI: doi:10.11588/data/JAV0ZK
• Datenträger: Online-Ressource
• Dokumenttyp: Forschungsdaten
• Dokumenttyp: Datenbank
• Sprache: eng
• Bibliogr. Hinweis: Forschungsdaten zu: Lindenthal, Sebastian: Understanding the optical properties of doped and undoped 9-armchair graphene nanoribbons in dispersion
• Sonstige Nr.: Grant number: ERC 817494 “TRIFECTs"
• Sach-SW: Chemistry
• Sach-SW: Physics
• K10plus-PPN: 1848792891
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

Graphene nanoribbons are one-dimensional stripes of graphene with width- and edge-structure-dependent electronic properties. They can be synthesized bottom-up 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 fractioned by liquid cascade centrifugation (LCC). Absorption and photoluminescence spectroscopy reveal two near-infrared absorption and emission peaks whose ratios depend on the LCC fraction. Similarly, the Raman D/G-mode ratios vary with fraction and indicate a higher defect density for fractions obtained at higher centrifugal forces. 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, pristine 9-aGNRs are assigned to the lowest energy transitions and 9-aGNRs with edge-defects, introduced by an incomplete graphitization, are assigned to more blue-shifted transition peaks. Hole doping of 9-aGNRs dispersion with the electron acceptor F4TCNQ leads to concentration dependent bleaching of the main absorption bands and redshifted, charge-induced absorption features but no new emission features, thus, indicating the formation of polarons instead of trions (charged excitons) in charged 9-aGNRs.