Research On Graphene Oxide Based Magnetic Fluorescent Multifunctional Nanocomposite Material

Graphene and graphene oxide are new materials with unique structure and performance, which make them widely used in electronics, information, energy storage, materials and biomedical fields, and also bring a new climax of the research all over the world. Fe3O4 nanomagnetic material and ZnO quantum dot fluorescent material have become a hot research in the field of materials, which have good application prospect in the optical, electric and magnetic field because of their unique magnetic and optical properties.In this paper, a new functional material with excellent performance was synthesized by a crosslinking of the nanomaterial with excellent properties. Specifically, the obtained graphene oxide based magnetic fluorescent nanocomposite material was synthesized by the amidation reaction via the method of chemical covalent cross-linking between the obtained excellently magnetic fluorescent SiO2 nanospheres by microemulsion method and graphene oxide sheets owing huge area, and studied its effect on loading ability of methylene blue. In addition, the further research on graphene oxide was also done, the graphene oxide/silver(GO-Ag) nanocomposites were synthetized, and the antibacterial properties of the synthetized GO-Ag nanocomposites were studied. The main research contents and results are as follows:(1) The graphene oxide and graphene oxide/silver(GO-Ag) nanocomposites based on GO sheets. The number of plies of the graphene oxide prepared by the improved Hummer method is small, and the thickness of is about 1.3 nm, it can be well dispersed in aqueous solution. Then, the graphene oxide/silver(GO-Ag) nanocomposites were prepared by using the synthesized graphene oxide in order to do further research on application of graphene oxide, and carried on the research on antibacterial property of the nanocomposites. The study found that the nanocomposite has strong antibacterial properties.(2) Mesoporous Fe3O4 nanoparticles, ZnO quantum dots and(Fe3O4-ZnO QDs)@SiO2 nanospheres. The prepared Fe3O4 nanoparticles own large surface area, good mesoporous property and higher superparamagnetic property. And the synthesis of ZnO quantum dots doped Mg2+ with better structure features, higher stability and photoluminescence properties. Finally, the synthesized(Fe3O4-ZnO QDs)@SiO2 nanosphere by the microemulsion method has high stability and dispersion. In terms of performance, the nanosphere has strong superparamagnetic and photoluminescence properties.(3)(Fe3O4-ZnO QDs)@SiO2-GO nanocomposites. We use chemical crosslinking method to prepare(Fe3O4-ZnO QDs)@SiO2-GO with(Fe3O4-ZnO QDs)@SiO2 nanospheres and GO sheets. In terms of structure, it has good dispersion and high stability, which can be uniformly and stably dispersed in aqueous solution, in terms of performance, it owns good superparamagnetic properties and photoluminescence properties: In the external magnetic field, it can quickly response and can emit high-intensitive fluorescence under the ultraviolet lamp irradiation.(4) The application of(Fe3O4-ZnO QDs)@SiO2-GO nanocomposites. The(Fe3O4-Zn O QDs)@Si O2-GO nanocomposites have a high load capacity when they were used as drug carrier. Studying the load performance of the nanocomposites by using methylene blue as a model drug, finally the result of the loading capacity is up to 1175.8 mg/g.