Open AccessTunable Superstructures of Dendronized Graphene Nanoribbons in Liquid Phase
Author(s) -
Fugui Xu,
Chunyang Yu,
Alexander Tries,
Heng Zhang,
Mathias Kläui,
Kristoffer Basse,
Michael Ryan Hansen,
Nerea Bilbao,
Mischa Bonn,
Hai I. Wang,
Yiyong Mai
Publication year - 2019
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.9b04927
Subject(s) - chemistry , superstructure , nanowire , supramolecular chemistry , band gap , graphene nanoribbons , exciton , tetrahydrofuran , graphene , nanotechnology , optoelectronics , crystallography , materials science , crystal structure , organic chemistry , condensed matter physics , oceanography , physics , geology , solvent
In this Communication, we report the first synthesis of structurally well-defined graphene nanoribbons (GNRs) functionalized with dendritic polymers. The resultant GNRs possess grafting ratios of 0.59-0.68 for the dendrons of different generations. Remarkably, the precise 3D branched conformation of the grafted dendrons affords the GNRs unprecedented 1D supramolecular self-assembly behavior in tetrahydrofuran (THF), yielding nanowires, helices and nanofibers depending on the dimension of the dendrons. The GNR superstructures in THF exhibit near-infrared absorption with maxima between 650 and 700 nm, yielding an optical bandgap of 1.2-1.3 eV. Ultrafast photoconductivity analyses unveil that the helical structures exhibit the longest free carrier (3.5 ps) and exciton lifetime (several hundred ps) among the three superstructure systems. This study opens pathways for tunable construction of ordered GNR superstructures with promising optoelectronic applications.
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