The Preparation, Characterization And Application Of Graphene Oxide Based Magnetic Nanocomposites

The extensive application of nanomaterials in biological medicine, chemistry, physical and other fields makes the development of nanotechnological deepning and expansion. Magnetic nanomaterials are beyond the application of nanotechnology which showing more specific magnetic characteristics than ordinary non-magnetic nanoparticles and has attracted wide attention of researchers. At the same time, the advantages of graphene oxide such as large specific surfaces areas, good water solubility and biocompatibility, rich surface fuctional groups on the surface, easy to be modified and so on has become a hot topic. Thus, the inherent advantages of graphene oxide based magnetic materials were prepared in conjuction with the advantages of both of them. And the graphene oxide based nanocomposites will absolutely have a good future.In the background outlined above, the research contents we expand on the preparation, characterization and application of the graphene oxide based nanocomposites which can be summarized as follows:Chapter one: Briefly introduced the magnetic properties of magnetic nanaoparticles, graphene oxide, and the application of graphene oxide based magnetic nanocomposite in biology, environment and catalysis.Chapter two: Using atom-scale coordinated strategy to prepare hierarchically porous Fe3O4-graphene frameworks and applicated it in selectively removing of organic dyes.Chapter three: Using atom-scale coordinated strategy to prepare hierarchically porous Fe3O4@Cu2-xS-graphene frameworks, and then load Pd nanoparticles on the frameworks to catalytic the Ullmann coupling reaction with light.Chapter four: Modified polyethylene imine(PEI) molecules on the surface of the graphene oxide to increase the biocompatibility of the graphene oxide. Then the coordination of the dumbbell-shaped Au-Fe3O4 nanoparticle and the covalently modified folic acid can not only be used to magnetic resonance but also can target cancer cells accurately. At the same time, taking the advantage of the π-π stacking interaction between the graphene oxide and anti-cancer drugs, the drugs can load on the surface of GO. In the acidic condition in cancer cells the drugs can be sustained released. At the same time it can be used for fluorescent detection of cancer cells, realize the multi-mode detection of cancer cells.