title: Controllable synthesis, magnetism and solubility enhancement of graphene nanosheets/magnetite hybrid material by covalent bonding.
abstract: Hybrids of Fe(3)O(4) nanoparticles and surface-modified graphene nanosheets (GNs) were synthesized by a two-step process. First, graphene nanosheets were modified by SOCl(2) and 4-aminophenoxyphthalonitrile to introduce nitrile groups on their surface. Second, the nitrile groups of surface-modified graphene nanosheets were reacted with ferric ions on the surface of Fe(3)O(4) with the help of relatively high boiling point solvent ethylene glycol to form a GNs/Fe(3)O(4) hybrid. The covalent attachment of Fe(3)O(4) nanoparticles on the graphene nanosheet surface was confirmed by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectrometer (EDS) and scanning electron microscopy (SEM). TEM and HRTEM observations indicated that the sizes of the nanoparticles and their coverage density on GNs could be easily controlled by changing the concentration of the precursor and the weight ratio to GNs. Magnetic measurements showed that magnetization of the hybrid materials is strongly influenced by the reaction conditions. Chemically bonded by phthalocyanine, the solubility of as-synthesized GNs/Fe(3)O(4) hybrid materials was greatly enhanced, which was believed to have potential for applications in the fields of composites, wastewater treatment and biomaterials.
authors.affiliation: Research Branch of Functional Materials, Institute of Microelectronic and Solid State Electronic, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
authors.forename: Yingqing
authors.initials: Y
authors.lastname: Zhan
authors.forename: Xulin
authors.initials: X
authors.lastname: Yang
authors.forename: Fanbin
authors.initials: F
authors.lastname: Meng
authors.forename: Junji
authors.initials: J
authors.lastname: Wei
authors.forename: Rui
authors.initials: R
authors.lastname: Zhao
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Liu
mesh_terms: D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D008280:Magnetics; D008422:Materials Testing; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D012995:Solubility; D013237:Stereoisomerism; D013499:Surface Properties
chemical_list: D006108:Graphite; D052203:Ferrosoferric Oxide