Ultra-Narrow Low-Bandgap Graphene Nanoribbons from Bromoperylenes-Synthesis and Terahertz-Spectroscopy.
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.
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.|InnovationLab GmbH, Organisch-Chemisches Institut, University Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.
Daniel
D
Jänsch
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Ivan
I
Ivanov
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.|Faculty of Chemistry and Pharmacy, Sofia University St. Kliment Ohridski, 1 James Bourchier Ave., Sofia, 1164, Bulgaria.
Yulian
Y
Zagranyarski
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.|Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287, Darmstadt, Germany.
Ivana
I
Duznovic
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Martin
M
Baumgarten
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Dimitry
D
Turchinovich
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Chen
C
Li
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Mischa
M
Bonn
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Klaus
K
Müllen
Yamamoto polymerization; cyclodehydrogenation; graphene nanoribbons; perylene dyes; terahertz spectroscopy