Abstract
Graphene is a promising material due to its fascinating properties, such as mechanical, electronic and thermal properties. Graphene based hybrids materials also have been widely studied due to its wide applications, such as sensors, energy storage and conversion, electronic device and others. The current study presents the synthesis of magnetite-reduced graphene oxide (M-rGO) nanocomposites through in situ chemical synthesis at different stirring durations. This synthesis process involves the redox reaction between the iron(II) salts and graphene oxide (GO) sheets. Various techniques were employed to characterize the synthesized M-rGO nanocomposites. From X-ray diffraction (XRD) results, the crystal structure of M-rGO was found to be independent on the stirring duration. Three magnetite vibrations, D band and G band were observed in Raman spectrum of M-rGO with 24 hours stirring duration. From Fourier transform infrared (FTIR) analysis, M-rGO with 24 hours stirring duration showed the strong intensity of Fe-O vibration. Thus, this indicated that a large amount of magnetite nanoparticles were covered on the surface of rGO sheets. This result is further supported by the morphology of nanocomposites from scanning electron microscopy (SEM) and the elemental analysis (EDX). A monolayer of rGO sheet (C= 33.79 atomic %) with full coverage of magnetite nanoparticles (Fe= 30.20 atomic %) was found for the M-rGO with 24 hours stirring duration. Overall, M-rGO require 24 hours of continuous stirring to ensure full coverage of magnetite nanoparticles on the surface of rGO sheets.
Highlights
In 2004, Novoselov and Geim were firstly isolated graphene from graphite through a simple mechanical exfoliation method [1]
We report one of the most convenient methods employed for the synthesis of magnetite reduced graphene oxide (M-rGO) nanocomposites by using in situ chemical synthesis
According to Low et al, X-ray diffraction (XRD) spectrum of Graphene oxide (GO) has a diffraction peak at 2θ= 8.59o [22]. The disappearance of this peak in the XRD spectra of M-rGO indicated that the oxygen functional groups were removed [22] and rGO was formed
Summary
In 2004, Novoselov and Geim were firstly isolated graphene from graphite through a simple mechanical exfoliation method [1]. Their works had opened a series of opportunities in the realization the usage of graphene in various science and technology due to the remarkable physiochemical properties [2]. Owing to the special surface properties, large surface area and layered structured, GO represents an excellent platform for the developing of graphene-based hybrids materials [7]. These graphene based hybrids materials have been intensively studied due to their wide applications [8, 9]
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