Résumé:

Hybrid system consisting in quaterthiophene derivative inserted into single and multi-walled carbon nanotubes is studied. Encapsulation efficiency of the conjugated oligomers in the hollow core of nanotube is investigated by Transmission Electron Microscopy and spatial resolved electron energy loss spectroscopy. We clearly show from Raman spectroscopy that the interaction between nanotubes and oligomers deeply depends on the metallic or semiconducting character of nanotubes. The charge transfer is shown to be significantly stronger for semiconducting tubes than for metallic ones. In addition, the shift of the Raman-active G band together with the appearance of a new peak in the 2D band of the semiconducting nanotubes state a n-type doping of the nanotubes. Complementary, the infrared spectra evidence a p-type doping of the oligomer.