Surfactant-free single-layer graphene in water Auteur(s): Bepete George, Anglaret E., Ortolani Luca, Morandi Vittorio, Huang Kai, Pénicaud Alain, Drummond Carlos (Article) Publié: Nature Chemistry, vol. p.10.1038/nchem.2669 (2016) Texte intégral en Openaccess : Ref HAL: hal-01407037_v1 DOI: 10.1038/nchem.2669 WoS: 000397278600010 Exporter : BibTex | endNote 86 Citations Résumé: Dispersing graphite in water to obtain true (single-layer) graphene in bulk quantity in a liquid has been an unreachablegoal for materials scientists in the past decade. Similarly, a diagnostic tool to identify solubilized graphene in situ has beenlong awaited. Here we show that homogeneous stable dispersions of single-layer graphene (SLG) in water can be obtainedby mixing graphenide (negatively charged graphene) solutions in tetrahydrofuran with degassed water and evaporatingthe organic solvent. In situ Raman spectroscopy of these aqueous dispersions shows all the expected characteristics ofSLG. Transmission electron and atomic force microscopies on deposits confirm the single-layer character. The resultingadditive-free stable water dispersions contain 400 m2 l–1 of developed graphene surface. Films prepared from thesedispersions exhibit a conductivity of up to 32 kS m–1. |