One-step pyrolytic synthesis and growth mechanism of core–shell type Fe/Fe3C-graphite nanoparticles-embedded carbon globules

Kumar, R and Sahoo, B (2018) One-step pyrolytic synthesis and growth mechanism of core–shell type Fe/Fe3C-graphite nanoparticles-embedded carbon globules. In: Nano-Structures and Nano-Objects, 16 . pp. 77-85.

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Abstract

We report the synthesis and detailed characterization of amorphous carbon globules containing Fe/Fe3C-graphite core–shell type nanoparticles. The samples were synthesized via a low-cost chemical vapour deposition (CVD) method by the single-step pyrolysis of precursors (benzene and ferrocene). The amount of precursors and the reaction temperature were found to control the morphology of the carbon globules, and the shape, size, composition and distribution of Fe/Fe–C based nanoparticles inside the carbon globules. At the CVD tube wall deposition of Fe derived from the decomposed-ferrocene forms Fe3C particles at high temperature, which are unstable in carbon rich environment and transforms to γ-Fe and carbon-product (graphite). Furthermore, γ-Fe is also unstable at RT and transforms to α-Fe and Fe3C phases while cooling. A fraction of γ-Fe is, however, kinetically arrested during the cooling process. This leads to the formation of ‘Fe/Fe3C (core)-graphite (shell)’ nanoparticles-embedded amorphous carbon globules.

Item Type:	Journal Article
Publication:	Nano-Structures and Nano-Objects
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Carbon encapsulation; Closed reactor pyrolysis; Core–shell iron/iron carbide particles; Mössbauer spectroscopy
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	05 Aug 2022 09:30
Last Modified:	05 Aug 2022 09:30
URI:	https://eprints.iisc.ac.in/id/eprint/75364

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