Ultra-Narrow Low-Bandgap Graphene Nanoribbons from BromoperylenesSynthesis and Terahertz-Spectroscopy

作者：Jaensch Daniel; Ivanov Ivan; Zagranyarski Yulian; Duznovic Ivana; Baumgarten Martin; Turchinovich Dimitry; Li Chen; Bonn Mischa; Muellen Klaus

来源：Chemistry - A European Journal, 2017, 23(20): 4870-4875.

DOI：10.1002/chem.201605859

• cyclodehydrogenation
• graphene nanoribbons
• perylene dyes
• terahertz spectroscopy
• Yamamoto polymerization

Soluble ultra-narrow armchair graphene nanoribbons (AGNRs) with length of approximate to 20nm and completely fused cores exceeding 5nm in length, pronounced near-infrared (NIR) absorption up to 1400nm, and a low band gap (approximate to 0.9eV) 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 (800nm) reveal their high intrinsic charge carrier mobility.

• 出版日期2017-4-6