“…Resonance Raman spectroscopy (RRS) is an efficient tool for probing optical and electronic properties of carbon-based hybrid systems, since the Raman spectrum of carbon nanotubes is very sensitive to charge transfer (CT) [15,16,17,18,19], structural modification [20,21,22], defects [23,24,25] and doping [26,27]. Actually, specifically for the 4T@SWCNT system, RRS has been used to show that the presence of the quaterthiophene induces a charge transfer between the guest 4T molecules and the host nanotubes.…”