Synthesis,Characterization And Properties Of Fe/Co-based Graphene Nanohybrids

The storage of carbon in the nature is very rich.It is an essential element for the organic life.At present,the study of graphene is most popular among the carbon materials.Graphene is a monolayer of carbon atoms,which is a honeycombed and two-dimensional crystalline material fored by the close packing of covalent bonds.Recently,graphene(G),as a new kind of carbon material,has attracted tremendous scientific attention in recent years because of its outstanding physical and chemical properties such as the excellent optical,electronic,thermal and mechanical properties,and so on.In this paper,we synthesized and systematically study the microwave absorption properties of Co@carbon nanotube(CNTs)-G,?-Fe2O3 nanoparticles(NPs)-reduced graphene oxide(RGO),?-FeOOH nanorods(NRs)-RGO and porous ?-Fe2O3 NRs-RGO nanohybrids.The detailed work is as follows:(1)In order to explore a high-performance microwave absorbing material,firstly,we synthesized Co@CNTs-G nanohybrids over Co3O4-reduced graphene oxide(RGO)by catalytic decomposition of acetylene at a certain temperature(400,450,500 and 550 °C).The obtained results indicated that the content of CNTs in the Co@CNTs-G nanohybrids could be controlled by the reaction temperature.Additionlly,we investigated the effect of CNT content on the magnetic and microwave absorption properties of the as-prepared nanohybrids.Finally,based on the experimental results,their growth and enhanced microwave absorption performance were systematically analyzed and discussed.(2)In order to explore the effect of microstructure on the microwave absorption properties of nanohybrids,firstly,we synthesized different kinds and morphologies of Fe-based RGO nanohybrids(?-Fe2O3 NPs-RGO,?-FeOOH NRs-RGO and porous ?-Fe2O3 NRs-RGO)by hydrothermal method.And the as-prepared nanohybrids exhibited excellent microwave absorption performance,which was proved to be ascribed to the quarter-wavelength matching model.Moreover,compared to the obtained ?-Fe2O3 NPs-RGO and ?-FeOOH NRs-RGO,the as-prepared porous ?-Fe2O3 NRs-RGO nanohybrids exhibited enhanced microwave absorption properties.Finally,based on the obtiaed results,the possible enhanced microwave absorption mechanisms were discussed in details.