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Characterization of structural transformation of graphene oxide to reduced graphene oxide during thermal annealing

Published online by Cambridge University Press:  16 March 2020

Iman Sengupta ,
Suddhapalli S.S. Sharat Kumar ,
Surjya K. Pal  and
Sudipto Chakraborty
Iman Sengupta
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
Suddhapalli S.S. Sharat Kumar
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
Surjya K. Pal
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
Sudipto Chakraborty*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
*
a)Address all correspondence to this author. e-mail: sc@che.iitkgp.ernet.in
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Abstract

Graphene enticed the scientific community for its interesting properties since its discovery. Among different synthesis routes of graphene, reduction of graphene oxide (GO) is mostly preferred because of scalability and advantage of modulation of properties of the end product. Thermal reduction of GO is considered to be the simplest and economic among different reduction techniques. The current work reports an experimental analysis of the structural evolution of GO to reduced graphene oxide (rGO) during thermal treatment. GO has been thermally annealed at an optimized temperature of 350 °C in ambient. Thermal reduction is observed after 7 min of annealing and confirmed by shifting of the first major peak from 12° to 23° in X-ray diffraction pattern. Significant carbon content enrichment and exfoliation are two aspects of the thermal reduction of GO. Carbon content suddenly enriches from 38 wt% in GO to 77 wt%. Exfoliation is confirmed by morphological alterations and decrease in carbon layers from eleven to three.

Keywords

annealingphase transformation
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 9 , 14 May 2020 , pp. 1197 - 1204
Copyright
Copyright © Materials Research Society 2020

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