A new approach to prepare highly conducting polyaniline films

We have developed a new method for preparing conducting polyaniline films and investigated their chemical and physical properties by means of UV-Vis., FT-IR, and de conductivity measurements. Conducting polyaniline films are prepared by casting directly a lithium salt containing non-conducting polyaniline solution. The dried films show high de conductivity even without further treatment with HCl. Effects of lithium salts, such as LiBF4, LiPF6, and LiClO4, and their concentrations on de conductivity are examined. The de conductivity of Pani-LiBF4 film is found to be better than those of Pani-LiPF6 and Pani-LiClO4 films. The de conductivity increases with lithium salt concentration ranging from 0.1M to 0.025M, and exhibits maximum value of-10(-1)S/cm when 0.1M LiBF4 is doped.