Ultra-narrow low-bandgap graphene nanoribbons from bromoperylenes

• Verfasst von: Jänsch, Daniel [VerfasserIn]
• Titel: Ultra-narrow low-bandgap graphene nanoribbons from bromoperylenes
• Titelzusatz: synthesis and terahertz-spectroscopy
• Verf.angabe: Daniel Jänsch, Ivan Ivanov, Yulian Zagranyarski, Ivana Duznovic, Martin Baumgarten, Dimitry Turchinovich, Chen Li, Mischa Bonn and Klaus Müllen
• Umfang: 6 S.
• Fussnoten: First published: 20 March 2017 ; Gesehen am 25.06.2018
• Jahr Quelle: 2017
• Band/Heft Quelle: 23(2017), 20, S. 4870-4875
• DOI: doi:10.1002/chem.201605859
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1576795381

Abstract

Soluble ultra-narrow armchair graphene nanoribbons (AGNRs) with length of ≈20 nm and completely fused cores exceeding 5 nm in length, pronounced near-infrared (NIR) absorption up to 1400 nm, and a low band gap (≈0.9 eV) are synthesized from 3,9(3,10)-dibromoperylene and 3,4,9,10-tetrabromoperylene. Since the monomers are obtained from perylene carboxyanhydrides, a remarkable link between dye and graphene chemistry is established. The two-step protocol for the AGNR synthesis by aryl-aryl coupling and subsequent cyclodehydrogenation is compared with a direct Yamamoto polymerization. Ultrafast photoconductivity analysis by optical pump-terahertz (THz) probe spectroscopy of the longest AGNRs excited in the NIR regime (800 nm) reveal their high intrinsic charge carrier mobility.