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Jashiela Wani et al: PREPARATION AND CHARACTERIZATION OF GRAPHENE-BASED MAGNETIC HYBRID NANOCOMPOSITE Fe/RGO 2.5:1 with low intensity as compared to pure magnetic particles. The peaks of Fe/RGO 2.5:1 appear at 2θ ≈ 19.3o (111), 35.4o (311), 43.1o (400), 53.7o (422) and 62.5o (440) indicated the characteristic of Fe3O4 nanoparticles while 2θ ≈ 24. 5o corresponds to the peak resulted from GO. However, formation of magnetite particles was not pure and might contain Fe2O3 particles and it was shown by at least two peaks of (220) and (511) indexes were missing. The synthesis reaction that was not carried out under nitrogen flow might be the reason for the unsuccessful magnetite formation since the ratio between Fe2+ and Fe3+ was probably disturbed during the fabrication process [15]. By using Scherer formula, average particle size of Fe/RGO 2.5:1 is estimated as 11.8 nm. Transmission Electron Microscope (TEM) The surface morphology of GO and the hybrid nanocomposites were studied by TEM whereby only GO and Fe/RGO nanocomposite with weight loading ratio of 2.5:1 and 1:4 were chosen as the representative samples (Figure 4). TEM analysis was performed on these two hybrids because Fe/RGO 2.5:1 presented the most significant characteristic peaks of XRD pattern while the analysis on Fe/RGO 1:4 was carried out to confirm that the higher loading ratio of GO might contribute to the disappearance of Fe-O absorption peak in the respective FTIR spectra. From the obtained TEM micrographs, there is significant difference between the as-prepared GO and RGO sheets in Fe/RGO 2.5:1 and Fe/RGO 1:4 hybrid. The RGO sheets present in the Fe/RGO 2.5:1 hybrid show less wrinkled sheet-like structure compared to GO and Fe/RGO 1:4 hybrid probably due to the exfoliation and reduction process during the synthesis. It has also been reported that, the layered morphology of GO tends to degrade at higher concentrations of iron oxide [16]. Figure 4. TEM micrographs of GO, Fe/RGO 2.5:1 and Fe/RGO 1:4 at magnification of 200 nm: (a, b, c), 100 nm: (d, e, f) and 50 nm: (g, h) respectively 154PDF Image | GRAPHENE-BASED MAGNETIC HYBRID NANOCOMPOSITE
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