Full conjugated self-assembled multilayer films from the two polymers

partially doped polyaniline(PANI)as polycation and poly(o-aminobenzoic acid)(PCAN)or poly(aniline-2-sulfonic acid)(PSAN)as polyanion

were fabricated with the layer-by-layer(LBL)technique.The experiments revealed that the UV-Vis absorbance of LBL films increased linearly with the increase of dipping cycle number

which indicated that the amount of polyelectrolyte deposition on the surface of the films in every cycle was uniform.Because sulfonic groups in PSAN had higher electro-negativity than carboxylic groups in PCAN

the molecular chain’s stretch and distance among chains were greater than that of PCAN.So the deposition amount of PANI-PSAN in every dipping cycle was less than that of PANI-PCAN in the same condition

which the absorbance of PANI-PSAN film was smaller than that of PANI-PCAN film in the same bilayer number.In conventional three-electrode CV test

the electrochemical properties of the two LBL films mainly depended on pure PANI because the conductibilities of both PCAN and PSAN were weaker than PANI.Compared with PANI-PSAN films

the electrochemical properties of PANI-PCAN films were better due to the effect of deposition.