Abstract
Poly(N-methylaniline) (PNMA) doped with p-toluenesulfonic acid (PTSA) was prepared chemically. Polymer synthesis was optimized for different dopant-to-monomer and oxidant-to-monomer ratios. The polymer was characterized by Fourier-transform infrared (FT-IR) and ultraviolet-visible absorption (UV–Vis) spectroscopy. The dependence of direct-current (DC) conductivity on temperature was studied in the range from 20 K to 300 K. The conductivity was found to follow the variable-range hopping (VRH) model of charge transport in the higher temperature range, while showing deviation at low temperature. The temperature dependence of the DC conductivity and activation energy data are indicative of the existence of both VRH and mixed conduction for various doping ratios in poly(N-methylaniline).
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