We have adopted different fitting procedures to study the Raman dispersion behavior of the G′ band in plasma‐treated multi‐walled carbon nanotubes (MWCNTs). Our analysis shows that the trend of the G′ band dispersion is related to the presence of defects in the MWCNTs. The intensity ratio dispersions involving the G'₂₁ , G'₃₂ , G'₄₁ , and G'₄₂ components of the G band behave in a similar way to the well known D to G band ratio ($D/G$ ), which is a good criterion for estimating the defect content in MWCNTs. The G'₂₁ , G'₃₂ , G'₄₁ , and G'₄₂ peaks are shown to belong to the lower‐frequency components of the G′ band by using two‐, three‐, and four‐peak fitting procedures. Conversely, the higher‐frequency components G'₂₂ , G'₃₃ , G'₄₃ , and G'₄₄ behave like the G band and are related to the non‐defect content. Consequently, the intensity ratios G'₂₁ /G'₂₂ , G'₃₂ /G'₃₃ , and G'41 + 42 /G'43 + 44 show the same dispersion behavior as that of $D/G$ . The difference of band position between the high and low frequency G′ band components is found to be sensitive to plasma treatment.
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Lee et al. (2011) studied this question.