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Synthesis and Characterization of Ionic Graphene Oxides (GO) for the Generation of New Multilayered Structures and Hybrid GO/Polymer Nanocomposites
Author(s) -
Ledezma Raquel,
Arizmendi Layza,
Rodríguez J. Alberto,
Castañeda Adali,
Ziolo Ronald F.
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201200055
Subject(s) - graphene , oxide , materials science , nanocomposite , raman spectroscopy , graphene oxide paper , ionic liquid , surface modification , chemical engineering , inorganic chemistry , polymer chemistry , nanotechnology , chemistry , organic chemistry , catalysis , engineering , physics , optics , metallurgy
Abstract The chemical surface modification of graphene and graphene oxide materials is a burgeoning area of investigation. We report the preparation of new ionic forms of graphene oxide by wet chemical modification and metathesis reactions. Graphene oxide (GO) was prepared by a modified Hummers method and functionalized to form cationic and anionic species. The former were prepared via nucleophilic substitution of alkyl amines at the epoxy and hydroxyl groups on the GO while the latter, consisting of sulfonated GO, was prepared via an aryl diazonium salt. The functionalized graphene oxide sheets consist of quaternary ammonium ion substituted GO, GO + , with Cl ‐ or I ‐ as counter ion and sulfonated GO, GO ‐ , with H + , Ba 2+ or tetraphenylphosphonium (TPP + ) ion as counter ions. The addition reaction between GO + and GO ‐ in aqueous solution by metathesis to form a black [GO + ][GO ‐ ] precipitate was also investigated. Materials were characterized by XRD, FTIR, Raman, STEM and TEM/HRTEM. Chemically modified graphene and graphene oxides are expected to facilitate further understanding of the chemistry and physics of graphene materials in general and contribute to the formation and further understanding of advanced hybrid graphene and graphene oxide polymer nanocomposites.1,2