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Chapter 5 – Production of Few Layer Graphene in Organic Solvents Figure 5.10: a) Individual Raman spectra obtained on FLG/NMP (48 hr, 6000 rpm) graphene paper at 20 different positions demonstrating the homogeneity of the film. b) Accuracy of the curve fit on 2D band using single Lorentzian function. All spectra were taken using 633 nm (He-Ne) laser. Figure 5.10a shows an example of ~15 individual Raman spectra obtained on a graphene film (FLG/NMP, 60 hr, 6000 rpm) produced. As can be seen only very little variations were observed in the spectra. This suggests the film produced is very homogenous and the values obtained were averaged and considered for analysis. The 2D band obtained contains a broad but symmetrical band, which can be fitted using single Lorentzian peak as shown in Figure 5.10b. It has to be noted that, single Lorentzian fit was not accurately fitted for all the observed samples. Some samples obtained at lower centrifugation speed (2000 rpm) had to be forced fitted to single Lorentzian. This may be because the presence of thicker flakes 〈𝑁〉 > 7) as observed in the AFM. 145PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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