Doping effect of C60 on soluble polyaniline

Doping effect of C60 on polyaniline has been re-examined using soluble polyanilines (poly(o-ethylaniline) and poly(o-phenetidine)), for which inert solvent to C60 can be used. An increase in the electrical conductivity from 5.0 × 10 −9 to 1.8 × 10 −7 S/cm has been found in the emeraldine-base form of poly(o-ethylaniline). With the combination of the electron spin resonance, infrared absorption and ultraviolet and visible absorption measurements for the C60-doped soluble polyanilines, C60 can have a rather weak charge-transfer interaction with these polymers generating no appreciable numbers of polarons in the polyaniline main chain.