Study on the Synthesis and Application of Core-Shell Structured Nanoparticles of Fe3O4

Abstract

This study addressed different materials to coat iron oxide, after using co-precipitation to synthesize. During synthesizing iron oxide, FeSO4•7H2O as a single raw material , was emphasized as a precursor salt. In advance, FeSO4•7H2O was oxidized into trivalence by using hydrogen peroxide, allocated Fe(Ⅱ)and Fe(Ⅲ) mole ratio as one to two, and synthesized ferric ferrous oxide nanoparticle by sodium hydroxide co-precipitation, which TX-100 was a protective agent to disperse uniformly.Depend on the morphology of several nanopartical types through the processing, separation of precursor salt solution and NaOH solution in pump by adding TX-100 solution would get Fe3O4 ratio more evenly. Besides during the experiment, variety loading of NaOH and dispersant, using two- stage method to add NaOH as well, rod and particle mixure would obtain.XRD, SQUID, HRTEM and SEM were used to analyze the particle size, uniformity, Magnetic, and Crystal structure. Also, intend to find the relation among synthesis and properties, and continue to work on electrodes for battery application to seek the optimal performance corresponded to synthesis conditions.Preparation of Fe3O4@Ag was took AgNO3 and C6H12O6, the reductant, into Fe3O4 solution. Different mole ratio of AgNO3 and Fe3O4 were mix- coated. Through the process, surface modifier makes coating completely and uniformly. Later, same analysis entailed to Fe3O4@Ag product powder. The purpose was to examine its completely coating, thickness, and magnetism.