Proton conductivity of acid-doped meta-polyaniline

Linear meta-polyaniline (m-PAni) has been synthesized and proton-conducting polymer membranes have been prepared through solution casting of acid-doped m-PAni. The obtained membranes show good proton conductivities at temperatures above 100 °C, achieving 10−2.7 S/cm at 120 °C under extremely low-humidity conditions. The effect of doping acids, doping levels and humidity, on the conductivity is discussed.