Investigation of disorder in carbon encapsulated core-shell Fe/Fe3C nanoparticles synthesized by one-step pyrolysis

Kumar, Rajeev and Sahoo, Balaram (2018) Investigation of disorder in carbon encapsulated core-shell Fe/Fe3C nanoparticles synthesized by one-step pyrolysis. In: DIAMOND AND RELATED MATERIALS, 90 . pp. 62-71.

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Abstract

Fe/Fe3C (core) - graphite (shell) nanoparticles embedded in micron sized amorphous carbon globules were synthesized by pyrolysis route in a closed reactor. A large number of such nanoparticles were observed to be distributed in the inner section of each globule covered by amorphous carbon in the outer regions. The distribution of nanoparticles varies according to the reaction-temperature-profile of the furnace during the synthesis process. These particles catalyze the formation of the graphitic coating on their surface, due to metastable nature of Fe3C. The globules which contain smaller catalyst particles were found to contain defectiveand less amount of graphitic carbon and large amount of amorphous carbon. We observed that for low synthesis temperature conditions the globules contain a thicker shell of amorphous carbon (without any catalyst particle). Furthermore, the amount of disorder in the graphitic layer is determined by the number and size of the (Fe/Fe3C) catalyst particles and reaction-temperature. The disorder in the graphitic layer on the particles can be potentially important for the catalytic behaviour of these particles.

Item Type:	Journal Article
Publication:	DIAMOND AND RELATED MATERIALS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright of this article belongs to ELSEVIER SCIENCE SA
Keywords:	Closed reactor pyrolysis; Fe/Fe3C nanoparticles embedded carbon-spheres; Defects; Raman spectroscopy
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	28 Jan 2019 08:40
Last Modified:	28 Jan 2019 08:40
URI:	http://eprints.iisc.ac.in/id/eprint/61461

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