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Morphological and Magnetic Properties of Superparamagnetic Carbon-Coated Fe Nanoparticles Produced by Arc Discharge

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Abstract:

Spherical carbon coated iron particles of nanometric diameter in the 5–10 nm range have been produced by arc discharge at near-atmospheric pressure conditions (using 5–8·104 Pa of He). The particles exhibit a crystalline dense iron core with an average diameter of 7.4±2.0 nm surrounded by a sealed carbon shell, shown by transmission electron microscopy (TEM), selected-area diffraction (SAED), energy-dispersive X-ray analysis (STEM-EDX) and electron energy loss spectroscopy (EELS). The SAED, EDX and EELS results indicate a lack of traces of core oxidized phases showing an efficient protection role of the carbon shell. The magnetic properties of the nanoparticles have been investigated in the 5–300 K temperature range using a superconducting quantum interference device (SQUID). The results reveal a superparamagnetic behaviour with an average monodomain diameter of 7.6 nm of the nanoparticles. The zero field cooled and field cooled (ZFC-FC) magnetization curves show a blocking temperature (TB) at room temperature very suitable for biomedical applications (drug delivery, magnetic resonance imaging, hyperthermia).

Keywords: ARC DISCHARGE; MONODOMAIN; NANOPARTICLES; SUPERPARAMAGNETISM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.1420

Publication date: April 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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