Other weak bands between 1100 and 1800 cm -1 can be observed in the spectra of GO as flakes and powders. These peaks are not present in pristine graphene or graphite. Some defects consist in "rings with different numbers of C atoms and configurations of C-O bonds. In these cases, a peak centered at∼1620 cm -1 , D' band," is appearing , and references therein). Literature is also reporting a peak located between 1150 and 1200 cm -1 (D*) and a broad peak between 1500 and 1550 cm -1 (D'') (see the graphical abstract by . In soot and carbon black too, these peaks have been evidenced. Claramunt et al. provide an extensive and detailed discussion of literature about the origin of the peaks they mentioned.