The incorporation of carbon nanotubes (CNTs) into polymers and metals modifies their intrinsic properties. Dispersing CNTs uniformly in a matrix remains challenging due to strong tube agglomeration. Raman spectroscopy is a compelling technique to detect the presence of CNTs and their interaction with the environment. In this work, Raman spectroscopy is applied in association with other techniques to investigate CNTs in a metallic or polymer matrix. Doping with superacids, analysis of defects in friction wear and CNT dispersion are investigated. Statistical analysis of Raman images are used to generate histograms of Raman bands maps in order to estimate the amount of CNTs and their dispersion. The diffusion of a Poly (Ether Ether Ketone) PEE...