Synthesis and Characterization of Graphite-Encapsulated Metal (Fe,Co,Ni) Nanoparticles by a Detonation Method
A method for synthesizing carbon-encapsulated metal nanoparticles(CEMNPs) is reported. In the proposed method, a composite precursors containing various nitrate dissolved in absolute ethanol is ignited by a nonelectric detonator in nitrogen gas in an explosion vessel. Upon the completion of detonation reaction, CEMNPs (Fe@C, Ni@C, Co@C) with diameters ranging from a few nanometers to about 20 nm are produced in the explosion vessel.The material characteristics of these nanoparticles are then examined with the XRD, TEM, EDX and VSM, which characterize the feature of morphology, components, phases and magnetism of nano-composite particles. The composite particles whose coating shell were graphite carbon could be dispersed finely. The core of nanoparticles were composed of iron,cobalt and nickel crystal to that of the above explosive precursors.The magnetic analysis indicated that the different composite nanoparticles have good ferromagnetism and superparamagetism in room temperature.
S. Itoh, J.J. Yoh and K. Hokamoto
X. J. Li et al., "Synthesis and Characterization of Graphite-Encapsulated Metal (Fe,Co,Ni) Nanoparticles by a Detonation Method", Materials Science Forum, Vol. 673, pp. 161-166, 2011