Abstract: The electrochemical polymerization rate of o-methylaniline in the acidic media is affected by the kind of acids. The difference Detweeh the polymerization rates leads to the variant morphologies between polymer films doped with Cl^-, BF₄^-, SO₄^2- and PO₄^3-, respectively. The conductivity and shape of the cyclic voltammogram of poly-o-methylaniline are dependent on the kind of the doped aions, and their capacity values are not only dependent on the kind of the doped anions, but also their morphologies) however, the electrochromic properties and UV-visible spectra are independent of the doped anions.

Key words: Doped anions, Poly-o-methylaniline, UV-visible spectrum, Electrochemical activity