Hamed Bakhshi, Ali Shokuhfar, and Nima Vahdati, Synthesis and characterization of carbon-coated cobalt ferrite nanoparticles, Int. J. Miner. Metall. Mater., 23(2016), No. 9, pp.1104-1111. https://dx.doi.org/10.1007/s12613-016-1328-7
Cite this article as: Hamed Bakhshi, Ali Shokuhfar, and Nima Vahdati, Synthesis and characterization of carbon-coated cobalt ferrite nanoparticles, Int. J. Miner. Metall. Mater., 23(2016), No. 9, pp.1104-1111. https://dx.doi.org/10.1007/s12613-016-1328-7

Synthesis and characterization of carbon-coated cobalt ferrite nanoparticles

  • Cobalt ferrite nanoparticles (CFNPs) were prepared via a reverse micelle method. The CFNPs were subsequently coated with carbon shells by means of thermal chemical vapor deposition (TCVD). In this process, acetylene gas (C2H2) was used as a carbon source and the coating was carried out for 1, 2, or 3 h at 750°C. The Ar/C2H2 ratio was 10:1. Heating during the TCVD process resulted in a NP core size that approached 30 nm; the thickness of the shell was less than 10 nm. The composition, structure, and morphology of the fabricated composites were characterized using X-ray diffraction, simultaneous thermal analysis, transmission electron microscopy, high-resolution transmission electron microscopy, and selected-area diffraction. A vibrating sample magnetometer was used to survey the samples’ magnetic properties. The deposited carbon shell substantially affected the growth and magnetic properties of the CFNPs. Micro-Raman spectroscopy was used to study the carbon coating and revealed that the deposited carbon comprised graphite, multiwalled carbon nanotubes, and diamond- like carbon. With an increase in coating time, the intensity ratio between the amorphous and ordered peaks in the Raman spectra decreased, which indicated an increase in crystallite size.
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