Preparation And Characterization Of Fe@FexO@Ni Nanocapacitors

The core-shell structure nanocomposites are a new type of nanomaterials which are composed by core material and shell material with the Physical interactions and chemical interactions. Core-shell structure could make two different materials integrated effectively. The core-shell nanocomposites can not only increase the chemical stability of the core materials but also make the electromagnetic properties, catalytic properties and optical properties of shell materials endued the core materials. So, the surface activity, stability and dispersion of core materials are improved effectively. With the synergistic effect of heterogeneity shell, the core-shell nanocomposites reflect the incomparable advantages.In this article, the Fe@FexO core-shell nanoparticles prepared by DC arc plasma are raw materials. In order to find the optimal reducing agent to deposit nickel at the surface of Fe@FexO nanoparticles by electrolysis plating, we obtain nanocomposites by choosing different reducing agent such as hydrazine hydrate、potassium borohydride and ethylene glycol, and all samples are characterized by XRD TEM XPS、FT-IR. The analysis shows that ethylene glycol as reducing agent is the optimal reducing agent, and Fe@FexO@Ni core-shell nanoparticles with the thickness of nickel shell is8-12nm can be obtained when ethylene glycol works as reducing agent and solvent, PH of solution is7.1, temperature of reaction is150℃, time of reaction is4hours. And the surface of Fe@FexO@Ni core-shell nanoparticles isn’t oxidized.In the case of ethylene glycol as reducing agent and solvent and solvent, temperature of reaction is150℃, time of reaction is4hours, by altering PH of solution, we obtained nanocomposites and samples are characterized by TEM. The analysis shows that when PH of solution increases, the FexO shell disappears gradually, so when the PH of solution is higher than7.1, the Fe@Ni core-shell is obtained, and the thickness of nickel shell increases gradually with the PH of solution increased.In the case of ethylene glycol as reducing agent and solvent and solvent, temperature of reaction is150℃, PH of solution is7.1, we obtained nanocomposites by changing the time of reaction, and all nanocomposites are characterized by TEM. The analysis shows that during the process of nickel deposition, the nickel ions firstly form amorphized nickel at the surface of Fe@FexO nanoparticles, then with the reaction conducts, amorphized nickel is crystallized and after4hour, Crystallized nickel deposits on the surface of Fe@FexO nanoparticles and form Fe@FexO@Ni core-shell nanoparticles.