Journal
CARBON
Volume 42, Issue 15, Pages 3177-3182Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2004.08.007
Keywords
carbonization, heat treatment, pyrolysis; reactivity, microstructure
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Carbon-encapsulated iron nanoparticles with uniform diameters have been synthesized on a large scale by co-carbonization of an aromatic heavy oil and ferrocene at 480degreesC under autogenous pressure. The morphologies and structural features of the iron/carbon composites were investigated using TEM, HREM and XRD measurements. It was found that, by increasing the amount of ferrocene added from 2 wt.% to 45 wt.%, the size of the nanoparticles increased from 15 nm to 50 nm and the morphologies of the resulting products changed from spherical-type to iron-filled carbon nanorods when the ferrocene loading was higher than 30 wt.%. The iron particles pyrolyzed from ferrocene exist mainly in the form of alpha-Fe and small amounts of Fe3C were also formed when the ferrocene content was higher than 20 wt.%. The formation mechanism of carbon-encapsulated iron nanoparticles is discussed briefly. This novel and simple approach constitutes a more practical method to prepare carbon-encapsulated metal nanoparticles than those reported to date. (C) 2004 Elsevier Ltd. All rights reserved.
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