Surface enhanced Raman scattering (SERS) spectroscopic studies reveal a particular chemical interaction of polyaniline/fullerene (PANI/C₆₀) composite with N-methyl pyrrolidinone (NMP). Chemical polymerization of aniline in the presence of sulfuric acid, potassium dichromate and fullerene has been used for the preparation of PANI doped with fullerene. The resulted composite material contains the polymer in the leucoemeraldine salt (LS) state. The interaction of this composite with NMP leads to a de-doping of PANI that appears as a transformation of the LS into leucoemeraldine base (LB). Besides, a gradually increase in the intensity of the Raman line with maximum at 1452 cm^-1 associated to A_g(2) pentagonal pinch mode of fullerene indicates formation of a charge transfer complex of the type fullerene-NMP. UV-VIS absorption spectroscopic studies regarding the kinetic of chemical interaction of the PANI/fullerene composite with NMP are also shown. After a storage of the PANI/fullerene composite in NMP, time of 19 days, a chemical treatment with iron chloride leads to a doped PANI having a protonated structure similar with the emeraldine salt. To evaluate the electrons number accepted of fullerene during of the above interactions, Raman studies on sample prepared by electrochemical polymerization of aniline on the fullerene film are presented, too.

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