Electrochemical polymerization of methylene green

The electrochemical polymerization of methylene green has been carried out using cyclic voltammetry. The electrolytic solution consisted of 4 x 10(-3) mol/L methylene green, 0.1 mol/L, NaNO3 and 1 x 10(-2) mol/L sodium tetrab orate with pH 11.0. The temperature for polymerization is controlled at 60 degreesC. The scan potential is set between -0.2 and 1.2 V (vs, Ag/AgCl wit h saturated KCI solution). There are an anodic peak and a cathodic peak on the cyclic voltammogram of poly(methylene green) at pH less than or equal t o3.8. Both peak potentials shift towards negative potentials with increasin g pH value, and their peak currents decrease with increasing pH value. Poly (methylene green) has a good electrochemical activity and stability in aque ous solutions with pH less than or equal to3.8. The UV-Visible spectrum and FTIR spectrum of poly(methylene green) are different from those of methyle ne green.