A biocatalytic route for the synthesis of a water soluble and conducting complex of polyaniline (PANI)/sodium dodecylsulfate (SDS) was presented. Hemoglobin as the biocatalyst was used in SDS anion surfactant. The effects of different reaction systems and pH on polymerization reaction of aniline were studied. The SDS micellar-templated polymerization of aniline is strongly pH-dependent in this case. A wider range at low pH (1.0～4.0) was required to produce the conducting PANI, optimal pH was 3.0 and the transition from emeraldine salt to emeraldine base form of PANI occurred at about pH 10.4 in this anionic micellar system. Elemental analysis, UV-Vis, FT-IR, cyclic voltammetry, viscosity, conductivity and TGA studies on the characters of PANI/SDS complex indicate the presence of a thermally stable and reversible electrochemical active form of PANI.

Key words: hemoglobin, biocatalysis, polyaniline, conductivity, micelle