SYNTHESIS AND CHARACTERIZATION OF GRAPHITE-COATED IRON-NICKEL NANOPARTICLES

Carbon-coated nanocrystal magnetic metals have become a hot subject of study because of its great potential usable value in recent years. But they can only be synthesized on a milligram scale by the available. The graphite-coated nanometer iron-nickel alloy has been prepared by using kalium to reduce the NiCl_(2)-FeCl_(3) graphite interlayer compounds (GICs) in this paper, and several grams of sample can be prepared once. The synthesized samples are relatively homogeneous in composition distribution, which contain 3.44 wt%-9.67 wt% Fe and 0 wt%-2.95wt% Ni. The nanocrystals (Fe, Ni) coated by graphite are homogeneous in size. Differences are due to the stage number of NiCl_(2)-FeCl_(3)GICs used as primary material. If the stage number is 2, the average size is 5.7 nm;if the stage number is 3, then the average size is 17.1 nm. The synthesized sample exhibits apparent superparamagnetism.