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://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://doi.org/10.1007/s12613-016-1328-7
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://doi.org/10.1007/s12613-016-1328-7
Citation:
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://doi.org/10.1007/s12613-016-1328-7
Advanced Materials and Nanotechnology Lab, Department of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, 19991-43344, Iran
Department of Materials Science and Engineering, Saveh Branch, Islamic Azad University, Saveh, 39197-15179, Iran
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.
Advanced Materials and Nanotechnology Lab, Department of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, 19991-43344, Iran
Department of Materials Science and Engineering, Saveh Branch, Islamic Azad University, Saveh, 39197-15179, Iran
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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