Non-covalent functionalization of graphene with a hydrophilic self-limiting monolayer for macro-molecule immobilization

[Display omitted] •A hydrophilic graphene surface is achieved by creating a self-limited monolayer with two designed pyrene derivatives.•The resulting charged surface of graphene can then be employed to selectively bind macro-molecules.•The method is applicable over graphene surface independently on...

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Bibliographic Details
Published in:FlatChem 2017-01, Vol.1, p.52-56
Main Authors: Bosch-Navarro, Concha, Laker, Zachary P.L., Marsden, Alexander J., Wilson, Neil R., Rourke, Jonathan P.
Format: Article
Language:English
Subjects:
Graphene
Hydrophilic
Molecule immobilization
Supramolecular
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Summary:[Display omitted] •A hydrophilic graphene surface is achieved by creating a self-limited monolayer with two designed pyrene derivatives.•The resulting charged surface of graphene can then be employed to selectively bind macro-molecules.•The method is applicable over graphene surface independently on the underneath support.•Atomic resolution of the immobilized macromolecules is achieved by transmission electron microscopy (TEM), proving that this approach is useful for making hydrophilic graphene TEM supports. Two different pyrene-substituted ions were used to render the surface of graphene hydrophilic. Self-limiting monolayers of ammonium and sulfonate substituted pyrenes were used to give, respectively, an overall positive and negative charge to the surface. Both pyrenes gave a stable hydrophilic surface and were used to selectively immobilise negatively or positively charged macro-molecules. This simple and versatile non-covalent approach can be used on graphene on a variety of substrates (e.g. copper, SiO2), suspended graphene, and also for graphite.
ISSN:2452-2627
2452-2627
DOI:10.1016/j.flatc.2016.11.001