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Chapter 6 β Production of Few Layer Graphene in Aqueous Media for Biological Studies Raman spectra and XRD were obtained from the thin films prepared by filtering the dispersions on 100 nm porous aluminium oxide filter membranes. The Raman spectra (Figure 6.7a) of the 0.1 v/v% dialysed dispersions show typical Raman bands: a sharp G band at ~1580 cm-1, a pronounced D band at ~1330 cm-1, a broad and symmetric 2D band at ~2660 cm-1, and shoulder peak, Dβ band at ~1617 cm-1. These bands are typical of the solvent-exfoliated graphene as discussed in the previous chapter.54, 59, 67 Most importantly, the Raman spectra of dialysed and starting (non-dialysed) dispersions are similar to each other (Figure 6.7a and Table 6-3). Figure 6.7: a) Raman spectra and b) XRD data of the starting (100 v/v%) and dialysed (0.1 v/v%) graphene dispersions. Data from graphite is shown for reference. The position, shape (broad) of the 2D band and the πΌ2π·βπΌπΊ ~0.5 of the dialysed graphene dispersions suggest that they are few layer (< 5 layers) in nature.48, 59 The relative intensity of the D band (πΌπ·βπΌπΊ) could suggest either presence of defects or be attributed to the edges. Since the laser spot was around 2 ΞΌm in diameter, a considerable amount of edge phonons would have contributed to the intense D band observed for both dialysed and starting dispersions. As explained in section 5.2.3.2 and the literature3, 172PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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