Role of pyrolysis reaction temperature and heating-rate in the growth and morphology of carbon nanostructures

Kumar, Rajeev and Rajendiran, Rajmohan and Choudhary, Harish Kumar and GM, Naveen Kumar and Balaiah, Badimela and AV, Anupama and Sahoo, Balaram (2017) Role of pyrolysis reaction temperature and heating-rate in the growth and morphology of carbon nanostructures. In: Nano-Structures & Nano-Objects, 12 . pp. 229-238. ISSN 2352507X

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Abstract

The effect of reaction temperature, heating rate of the precursors and length of the reaction zone of the furnace on the morphology of carbon nanostructures synthesized via a single-step pyrolysis route is studied. When the furnace was heated at a slow heating rate the synthesized products have highly amorphous globular morphology regardless of the length of the heating zone and the reaction temperature. The amorphous globules contain a dispersion of Fe-based particles. Higher graphitization around the Fe-based particles is observed upon increasing the synthesis temperature. The heating rate has the highest influence on the morphology of the products. When the furnaces were heated (naturally) at a low rate of ∼3 °C/min up to the reaction temperature amorphous carbon globules formed, while carbon nanotubes formed when the heating rate was increased to 20 °C/min in a controlled manner. When the synthesized samples were calcined in air at 400 °C for 1 h, the amorphous carbon graphitizes and the graphitic phase forms agglomerated nanotube-like structure.

Item Type:	Journal Article
Publication:	Nano-Structures & Nano-Objects
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	Calcination; Carbon nanostructures; Graphitization; Heating rate; Pyrolysis temperature
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	01 Jun 2022 05:19
Last Modified:	01 Jun 2022 05:19
URI:	https://eprints.iisc.ac.in/id/eprint/72880

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