The New Fe₃O₄-Carbon Nanocomposites:Design Synthesis And Application

Fe₃O₄ nanoparticles and Fe₃O₄ composite nanomaterials have been widely used in the fields of MRI contast agent,florescence imaging,catalysis,littnium ion cells,microwave absorption,separating detecting,catalytic carrier,and drug delivery due to their qualities and structures.In this paper,the main content in the paper as follows:We synthesized Fe₃O₄ nanoparticles through a facile co-deposition method.We characterize these particles with SEM and TEM.The solubility of Fe₃O₄ nanoparticles is well and the size of Fe₃O₄ nanoparticles is about 5 nm.These particles have a well promise in the fields of composites.We synthesized Fe₃O₄@resin,Fe₃O₄@resin@SiO2 and Fe₃O₄ @SiO2@resin core-shell composites.And Fe₃O₄@carbon core-shell materials are prepared by the carbonization of the Fe₃O₄@resin under N2.The sizes of the Fe₃O₄@carbon are between 250-300 run.The composites materials are characterized by the SEM and magnetic separation.Fe₃O₄/carbon composite materials were used to modify the glass carbon electrode.We used the composite electrode to detect the dopamine in the pH 7 PBS buffer solution.The best linear relationship between the current response and the dopamine concentration was exhibited in the range 1-100?mol/L.Fe₃O₄/carbon composite materials are porous and have a good absorptive ability to the dopamine.Therefore,the composite materials have a promise in the fields of biosensors,separation,lithium ion cell,catalysis.