Supramolecular Nanostructures of Structurally Defined Graphene Nanoribbons in the Aqueous Phase.
Angew Chem Int Ed Engl
; 57(13): 3366-3371, 2018 03 19.
Article
em En
| MEDLINE
| ID: mdl-29397013
ABSTRACT
Structurally well-defined graphene nanoribbons (GNRs) have attracted great interest because of their unique optical, electronic, and magnetic properties. However, strong π-π interactions within GNRs result in poor liquid-phase dispersibility, which impedes further investigation of these materials in numerous research areas, including supramolecular self-assembly. Structurally defined GNRs were synthesized by a bottom-up strategy, involving grafting of hydrophilic poly(ethylene oxide) (PEO) chains of different lengths (GNR-PEO). PEO grafting of 42-51 % percent produces GNR-PEO materials with excellent dispersibility in water with high GNR concentrations of up to 0.5â
mg mL-1 . The "rod-coil" brush-like architecture of GNR-PEO resulted in 1D hierarchical self-assembly behavior in the aqueous phase, leading to the formation of ultralong nanobelts, or spring-like helices, with tunable mean diameters and pitches. In aqueous dispersions the superstructures absorbed in the near-infrared range, which enabled highly efficient conversion of photon energy into thermal energy.
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MEDLINE
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En
Ano de publicação:
2018
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Article