Preparation and Magnetic Properties of Carbon Encapsulated Fe-Cu Alloy Nanoparticles

Abstract

Carbon encapsulated Fe-Cu alloys nanoparticles were synthesized by using ferric nitrate, copper nitrate as metal sources and using sucrose as carbon source. The synthesis process involved a step of hydrazine hydrate reduction in alcohol solution and a step of annealing carbonization. The as-prepared samples were characterized by X-ray diffraction technique, X-ray energy dispersion spectrograph, trans- mission electron microscopy and Raman spectroscopy. The results showed the sample was core / shell structure, the metalic core was crystalline FeCu4 alloy, the shell was amorphous carbon, and the average particle size was about 51nm. The magnetic measurement by using a vibrating sample magnetometer revealed that the sample has ultra-soft magnetic property with the saturation magnetization Ms of 13.01 emu/g, residual magnetization Mr of 0.37 emu/g and coercive forces Hc of 54.43 Oe at room temperature.

Synthesis and characterization of Fe/C core–shell nanoparticles

“…However, all the peaks of Sample C could be indexed to body-centered cubic (bcc) a-Fe (JCPDS 06-0696) perfectly, indicating the pure bcc Fe phase in the final product. A diffusion peak from about 151 to 351 reveals the amorphous characteristic of the carbon in Sample C [21].…”

Bimetal CuFe Nanoparticles—Synthesis, Properties, and Applications

“…FeCu nanoparticles have also been produced by chemical reduction [40][41][42][43][44][45][46][47]. FeCu nanoparticles were synthesized from chemical reduction of Cu and Fe dodecyl sulfate (Fe(DS) 2 and Cu(DS) 2 ) by sodium borohydride (NaBH 4 ) and their magnetic properties were studied by Duxin et al [40].…”

“…FeCu alloy nanoparticles encapsulation in carbon (FeCu@C) by a combination of a chemical reduction of ferric nitrate Fe(NO 3 ) 3 •9H 2 O and copper nitrate Cu(NO 3 ) 2 •3H 2 O in alcohol solution and annealing carbonization (Figure 6) was performed by Xue et al [45]. The core-shell nanoparticles, with FeCu 4 core and amorphous carbon shell, with particles size ranging from 24 nm to 73 nm, and coating thickness of approximately 5 nm were produced.…”