Toward Cove-edged Low Band Gap Graphene Nanoribbons

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2015 Apr 25

PMID 25909566

Citations 48

Authors

Junzhi Liu

Bo-Wei Li

Yuan-Zhi Tan

Angelos Giannakopoulos

Carlos Sanchez-Sanchez

David Beljonne

Pascal Ruffieux

Roman Fasel

Xinliang Feng

Klaus Mullen

Affiliations

Soon will be listed here.

Abstract

Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increasing attention as promising candidates for next-generation semiconductors. Here, we demonstrate a bottom-up strategy toward novel low band gap GNRs (Eg = 1.70 eV) with a well-defined cove-type periphery both in solution and on a solid substrate surface with chrysene as the key monomer. Corresponding cyclized chrysene-based oligomers consisting of the dimer and tetramer are obtained via an Ullmann coupling followed by oxidative intramolecular cyclodehydrogenation in solution, and much higher GNR homologues via on-surface synthesis. These oligomers adopt nonplanar structures due to the steric repulsion between the two C-H bonds at the inner cove position. Characterizations by single crystal X-ray analysis, UV-vis absorption spectroscopy, NMR spectroscopy, and scanning tunneling microscopy (STM) are described. The interpretation is assisted by density functional theory (DFT) calculations.

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