Open AccessSolution Synthesis and Characterization of a Long and Curved Graphene Nanoribbon with Hybrid Cove–Armchair–Gulf Edge Structures
Author(s) -
Yang Lin,
Ma Ji,
Zheng Wenhao,
Osella Silvio,
Droste Jörn,
Komber Hartmut,
Liu Kun,
Böckmann Steffen,
Beljonne David,
Hansen Michael Ryan,
Bonn Mischa,
Wang Hai I.,
Liu Junzhi,
Feng Xinliang
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202200708
Subject(s) - graphene , band gap , density functional theory , materials science , ribbon , raman spectroscopy , cove , polymerization , monomer , fourier transform infrared spectroscopy , polymer , electronic structure , graphene nanoribbons , polymer chemistry , nanotechnology , computational chemistry , chemistry , optoelectronics , composite material , optics , physics , geomorphology , geology
Curved graphene nanoribbons (GNRs) with hybrid edge structures have recently attracted increasing attention due to their unique band structures and electronic properties as a result of their nonplanar conformation. This work reports the solution synthesis of a long and curved multi‐edged GNR ( cMGNR ) with unprecedented cove–armchair–gulf edge structures. The synthesis involves an efficient A 2 B 2 ‐type Diels–Alder polymerization between a diethynyl‐substituted prefused bichrysene monomer ( 3b ) and a dicyclopenta[ e , l ]pyrene‐5,11‐dione derivative ( 6 ) followed by FeCl 3 ‐mediated Scholl oxidative cyclodehydrogenation of the obtained polyarylenes ( P1 ). Model compounds 1a and 1b are first synthesized to examine the suitability and efficiency of the corresponding polymers for the Scholl reaction. The successful formation of cMGNR from polymer P1 bearing prefused bichrysene units is confirmed by FTIR, Raman, and solid‐state NMR analyses. The cove‐edge structure of the cMGNR imparts the ribbon with a unique nonplanar conformation as revealed by density functional theory (DFT) simulation, which effectively enhances its dispersibility in solution. The cMGNR has a narrow optical bandgap of 1.61 eV, as estimated from the UV–vis absorption spectrum, which is among the family of low‐bandgap solution‐synthesized GNRs. Moreover, the cMGNR exhibits a carrier mobility of ≈2 cm 2 V −1 s −1 inferred from contact‐free terahertz spectroscopy.