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Carbon Encapsulated Magnetic Nanoparticles Produced by a Catalytic Disproportionation of Carbon Monoxide

Published online by Cambridge University Press:  01 February 2011

Oleg Prilutskiy ,
Eugene A. Katz ,
Alexander I. Shames ,
D. Mogilyanski ,
Emma Mogilko  and
Ishai Bruckental
Oleg Prilutskiy
Affiliation:
Department of Solar Energy & Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
Eugene A. Katz
Affiliation:
Department of Solar Energy & Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel
Alexander I. Shames
Affiliation:
Department of Physics, Ben-Gurion University of the Negev, P.O.Box 653, 84105 Be'er-Sheva, Israel
D. Mogilyanski
Affiliation:
Institutes of Applied Research, Ben-Gurion University of the Negev, P. O. Box 653, 84105 Be'er-Sheva, Israel
Emma Mogilko
Affiliation:
Department of Physics, Bar-Ilan University, Ramat Gan 51900, Israel
Ishai Bruckental
Affiliation:
Department of Physics, Bar-Ilan University, Ramat Gan 51900, Israel
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Abstract

Carbon nanocapsules with a ferromagnetic core of single-crystalline Fe3O4 are demonstrated to be effectively synthesized and collected separately from the other nano-carbon products of the low-temperature reaction of catalytic disproportionation of carbon monoxide. HRTEM demonstrated a defect-free crystalline structure of the Fe3O4 nanoparticles. The encapsulating carbon shells of the Fe3O4 nanoparticles are stable in air at room temperature, but do not prevent them at high temperatures. Accordingly, these nanoparticles may also act as catalysts for the corresponding production of carbon nanomaterials via carbon monoxide disproportionation. In particular, we demonstrate the corresponding transformation of a Fe3O4 core to an iron carbide nanoparticle with simultaneous formation of additional encapsulating carbon layers. Characterization of the synthesized materials by DC magnetization represents clearly resolved hysteresis loops. However characteristic S-shape of the loops (magnetization is still not saturated at 16 kOe) points out some superparamagnetic effects driven by the nano-size origin of the samples. Analysis of the sample's EPR spectra provides an additional insight to the coexistence of several magnetic phases in the synthesized nanomaterials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S5.10
Copyright
Copyright © Materials Research Society 2005

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