| Abstract: | In-situ electron spin resonance studies of polyaniline at various applied potentials in media of pH 0.49, 2.09, 3.96, anf 9 are reported. The g factor of the esr signal is 2.0036 and does not vary with the applied potential. The peak to peak linewidth decreases to a minimum in a potential range which depends on the pH of the medium. On the other hand, the spin density increases to a maximum in the same potential range. The pH-potential range where the highly conductive form exists, matches very well the range of narrow linewidth and high spin density of the esr signal. The conductive form of polyaniline consists of highly mobile radical cations or polarons. |
