The research included a study of the effect of double doping on the electrical conductivity of polyaniline (PANI) after it was prepared by pure aniline polymerization (oxidation polymerization) as a first step, and then doping the polyaniline by monomeric doping with acid solutions of each of the two acids H2SO4 and HCl with different concentrations each separately, then doping Polyaniline monomeric doping with chloride salt (FeCl3, HgCl2, CuCl2, AgCl ) with different weight ratios. The acidic doped polyaniline was doped again with salt, the third step, It is the process of double doping of a polymer using acids and metal salts together. As this process is done by doping the polymer with sulfuric acid at a concentration of (1M) (which gave the highest electrical conductivity), and then re-doping this acid-stained doped form using the metal salt (HgCl2) (which gave the highest electrical conductivity among other ionic dopants) and by weight ratios% (3, 5, 10, 15, 20).
The characteristics of (I-V) were measured to show the mechanism of electrical conduction in the polymer using an electrical circuit manufactured locally in the laboratory and by applying different efforts, as the results were shown. The double doping has a clear effect on the electrical conductivity, and it is higher than the electrical conductivity of the un-dopped and monomeric models with acid solutions or metal salts.