title: Magnetically modified single and turbostratic stacked graphenes from tris(2,2'-bipyridyl) iron(II) ion-exchanged graphite oxide.
abstract: Loading of graphite oxide (GO) with tris(2,2'-bipyridyl) iron(II) ions and subsequent calcination affords a novel graphene-based composite with magnetic and electrically conductive properties. The pH of the starting aqueous suspension and the washing procedure play a crucial role in the successful immobilization of the iron precursor, which is mainly governed by ion exchange. The complex is intercalated between the graphene oxide layers, where it adopts a distorted conformation. Rapid heating of this solid results in the deflagration of GO and the formation of ultrafine ( d = 2-14 nm) Fe2O3 particles with maghemite as the dominant phase. The superparamagnetic maghemite crystals are dispersed uniformly in the high-surface-area diamagnetic matrix built up from single or turbostratic stacked graphenes.
authors.affiliation: Department of Colloid Chemistry, University of Szeged, Szeged, Hungary.
authors.forename: Tamás
authors.initials: T
authors.lastname: Szabó
authors.forename: Aristides
authors.initials: A
authors.lastname: Bakandritsos
authors.forename: Vassilis
authors.initials: V
authors.lastname: Tzitzios
authors.forename: Eamonn
authors.initials: E
authors.lastname: Devlin
authors.forename: Dimitris
authors.initials: D
authors.lastname: Petridis
authors.forename: Imre
authors.initials: I
authors.lastname: Dékány