of all the PPy Raman bands can be found elsewhere (Furukawa,Tazawa, Fujii, & Harada, 1988). In general lines, three different oxidation states of PPy are readily identified by Raman spectroscopy,neutral, cationic (PPy+) and dicationic (PPy++). These states are directly related to the electron delocalization alongside the polymer backbone and consequently to their degree of doping