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Synthesis and characterization of carbon-coated cobalt ferrite nanoparticles

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Abstract

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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Authors and Affiliations

  1. Advanced Materials and Nanotechnology Lab, Department of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, 19991-43344, Iran

    Hamed Bakhshi & Ali Shokuhfar

  2. Department of Materials Science and Engineering, Saveh Branch, Islamic Azad University, Saveh, 39197-15179, Iran

    Nima Vahdati

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  1. Hamed Bakhshi
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Correspondence to Hamed Bakhshi.

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Bakhshi, H., Shokuhfar, A. & Vahdati, N. Synthesis and characterization of carbon-coated cobalt ferrite nanoparticles. Int J Miner Metall Mater 23, 1104–1111 (2016). https://doi.org/10.1007/s12613-016-1328-7

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  • DOI: https://doi.org/10.1007/s12613-016-1328-7

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