Figure S2 presents the results of the Lorentzian fit performed on the curves shown in figure 1 of the main text (pristine CNTs on the left, oxidized CNTs on the right). The fits allowed to obtain the D and G band intensities, calculated as the area of the respective spectroscopic features located at about 1330 and 1590 cm-1. The ratio R between the D and G band intensities has been then calculated to estimate the CNT structural disordering induced by the oxidation procedure. The Raman spectrum collected on pristine CNTs is associated to an R value of (0.21±0.02), which rises to (1.7±0.1) after the chemical treatment.