materials since the spectrum is collected over a broad region. Considering these, 796 cm 1 TO peak intensity ratio was chosen as a normalizing factor for all the materials. Finally, the spectra for monolithic SiC was subtracted from graphene-SiC spectra to get Raman signal only from graphene nanoplatelets as shown in Fig. 21.8. After subtraction, D, G, and G0 peaks can be identified for AHPCS-2 wt% C and AHPCS-5 wt% C samples sintered at 2,000 and 2,100 ∘ C. However, negative D, G, and G0 were observed for SiC-2 wt% C and SiC-5 wt% C samples sintered at 2,000 ∘ C. For 2,100 ∘ C sintering temperature, no D, G, and G0 were observed for SiC-2 wt% C and SiC-5 wt% C samples. This warranted further investigation in this matter and is currently being undertaken. Fig. 21.7 Raman Spectra for (a) 2,000 ∘ C samples and (b) 2,100 ∘ C samples before normalization Fig. 21.8 Raman Spectra for (a) 2,000 ∘ C samples and (b) 2,100 ∘ C samples after subtraction of the spectra of monolithic SiC 174 A. Rahman et al.
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