Fig. 2: Two-peak fit of the (G+D’)-Raman band.
From: Degradation analysis of tribologically loaded carbon nanotubes and carbon onions

Exemplary two-peak fits of the (G+D’)-band in the Raman spectrum of a CNTs and b COs. A Lorentzian peak shape is used to fit the G-band, and a Voigtian peak profile is used to fit the D’-band.