Highly Crystalline Polyaniline Nanostructures Doped with Dicarboxylic Acids

Highly crystalline polyaniline (PANI) nanotubes and nanofibers ca. 80–170 nm in diameter are successfully prepared by a “micelle soft‐template” method in the presence of dicarboxylic acids dopants with different numbers (n) of –CH2– groups (n = 0–4). It is found that the diameter of the nanostructures increases on increasing the number of –CH2– groups in the dicarboxylic acids. The conductivity of the nanostructures increases as their diameters decrease, showing that size has an effect on conductivity. A narrow peak at 2θ = 6.50° is observed in the X‐ray diffraction pattern, indicating that the distance in the direction perpendicular to the polymer chain increases as the number of –CH2– groups increases.