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Nanomaterials 2019, 9(4), 602; https://doi.org/10.3390/nano9040602

Universal Method for Producing Reduced Graphene Oxide/Gold Nanoparticles Composites with Controlled Density of Grafting and Long-Term Stability

1
Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland
2
Faculty of Physics, University of Warsaw, 5 Pasteura st., 02-093 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Received: 21 March 2019 / Revised: 6 April 2019 / Accepted: 7 April 2019 / Published: 11 April 2019
PDF [2496 KB, uploaded 11 April 2019]

Abstract

In this study, we report a universal approach allowing the non-covalent deposition of gold nanoparticles on reduced graphene oxide surface in a controlled fashion. We used a modified Hummers method to obtain graphene oxide, which then underwent surficial functionalization with carboxyl moieties coupled with simultaneous reduction. Nanoparticles were synthesized ex-situ and capped with a thiolated poly-ethylene glycol (PEG) ligand. The interactions between the surface of modified graphene oxide and nanoparticle ligands enabled the formation of stable hybrid graphene-nanoparticles materials in the aqueous phase. Using this technique, we were able to cover the surface of graphene with gold nanoparticles of different shapes (spheres, rods, triangles, stars, and bipyramids), broad range of sizes (from 5 nm to 100 nm) and controlled grafting densities. Moreover, materials obtained with this strategy exhibited long-term stability, which coupled with the versatility and facility of preparation, makes our technique appealing in the light of increasing demand for new graphene-based hybrid nanostructures.
Keywords: graphene; reduced graphene oxide; nanoparticles; anisotropic; nanotriangles; nanostars; nanorods; bipyramids graphene; reduced graphene oxide; nanoparticles; anisotropic; nanotriangles; nanostars; nanorods; bipyramids
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Szustakiewicz, P.; Kołsut, N.; Leniart, A.; Lewandowski, W. Universal Method for Producing Reduced Graphene Oxide/Gold Nanoparticles Composites with Controlled Density of Grafting and Long-Term Stability. Nanomaterials 2019, 9, 602.

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